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Owia Charge Controller MPPT Over-Voltage Fry wɔ Sub-Zero Awɔw mu, Voc Ɔhyew Nsusuwii Nkontaabu, ne BMS Low-Temp Charge Lockout

Ɛsono dodow a wɔde ma ntɛm ara wɔ ɔman biara mu. Kratafa yi de 911, nɔma a wɔde ma United States ne Canada na edi dwuma. Aman afoforo pii de 112, 999, anaa nɔma foforo di dwuma. Hwehwɛ nɔma a ɛwɔ wo man mu.

Sɛ wo nantew kɔ wo dan a ɛnyɛ anyinam ahoɔden mu, owia ahoɔden dan, camper van, anaa ofie ketewaa bi mu wɔ awɔw bere mu anɔpa a emu tew te sɛ ahwehwɛ, a ɛnyɛ zero wɔ 07:30 sɛ wobɛte ɛlɛtrɔnik mfiri a wɔahyew a ɛyɛ nwini hua a, wubehu screen a awu anaa ** ."Error #20 / PV Over-Voltage"** wɔ wo Tumi a Ɛsen Biara a Wɔde Di Dwuma (MPPT) owia ahoɔden sohwɛfo ( .Victron SmartSolar, Renogy Rover, MidNite Classic, Epever, OutBack FM80, or EG4/Sol-Ark hybrid inverter), na hwehwɛ wo ** .LiFePO4 (Lithium Iron Phosphate)** battery bank a wɔatoto mu wɔ 0 Amps of charging yɛ awɔw bere mu tebea horow a egye ntɛmpɛ a ɛsɛe ade sen biara na wɔnte ase yiye wɔ anyinam ahoɔden a ɛnyɛ anyinam ahoɔden mu no mu biako. Honam fam mmara abien a ɛde ne ho bɔ wɔ awɔw bere mu anɔpa a awɔw wom: (1) Ɛkame ayɛ sɛ ɛnte sɛ anyinam ahoɔden mfiri foforo biara, silicon photovoltaic (PV) owia ahoɔden mfiri ma HIGHER voltage kɛse bere a ɛyɛ nwini (rising by 0.30% to 0.40% for every 1°C drop below 25°C / 77°F), ne (2) Lithium Dade Phosphate ( .LiFePO4) batere nkwammoaa hu amane wɔ dade lithium a wɔde adura ho a wontumi nsakra no sɛ wɔde charge wɔ ase hɔ a 0°C (32°F), a ɛhyɛ wɔn Battery Management System a ɛwɔ mu (BMS) sɛ wobɛbue charge MOSFETs ( .Low-Temperature Charge Protection - LTCP) na ɛyɛ.

Bere a saa nsɛm abien no si bere koro mu bere a owia apue wɔ a -25°C (-13°F) anɔpa, wo nwini LiFePO4 battery BMS siw mprempren nsu a ɛsen nyinaa ano (holding the solar array at 100% Open-Circuit Voltage - Voc a adesoa zero na ɛtwe ahoɔden no kɔ fam), bere a awɔw a ɛba fam sen zero a wɔde ka ho ne sukyerɛmma-albedo reflection no ma owia hama bi a ɛsusuw dwoodwoo 136 Volts wɔ July mu tẽẽ kosi ** .163 Volts**, ntɛm ara a ɔrebɔ akuturuku afa 150V silicon MOSFET ceiling a wo MPPT controller ne shorting controller no fi mununkum mu wusiw. Sɛ owia solar controller, inverter, anaa lithium battery bank a ɛwɔ ahoɔden boro so no renom sigaret, ɛreyɛ arcing, anaa ogya rehyew mprempren a, tu fi hɔ ntɛm ara na frɛ wo mpɔtam hɔ nɔma a egye ntɛmpɛ (911 wɔ United States ne Canada no, . 112 wɔ Europa Aman Nkabom no nyinaa mu, . 999 wɔ United Kingdom no, . 000 wɔ Australia) anaasɛ wobɛbisabisa wo nsɛm nɔma ahorow a egye ntɛmpɛ. Sɛ wopɛ anyinam ahoɔden ne awɔw bere mu nsɛm a egye ntɛmpɛ a ɛnyɛ anyinam ahoɔden a ɛfa ho a, hwɛ off-grid inverter overload, ɔhyew controller, ne 12V/24V/48V battery bank tiawa, . owia ahoɔden, nsu, ne nwura a ɛnyɛ adwuma yiye, na anyinam ahoɔden ogya a ɛtɔ.

Yɛ eyi mprempren

  1. SƐ WO SOLAR CHARGE CONTROLLER NO REDA OVER-VOLTAGE ALARM (e.g., Victron Error #19 / #20 / #24, Epever E08, Renogy E08), WO KLIKI MMƆDENBƆ, ANAA WO AHYƐ HƆHWƐ HUA WƆ ANƆPA A WƆYƐ NHYEHYƐE MU: Tow Tarp anaa Blanket a Ɛyɛ Tum To Panel Baako So wɔ Series String Biara mu ANSA NA Wobɛka Breaker anaa MC4 Connector Biara a Wɔanhyɛ Da Nnuru.
  2. MMFA afiri bi a ɛwɔ ɔdan atifi no mfi mu DA MC4 solar connector anaa bue DC breaker a ne bo nyɛ den a ɛnyɛ polarized bere a owia hann a ano yɛ den rebɔ panels no na current resen (or if the MPPT input FETs have shorted together). Tẽẽ-nkyɛm (Tẽẽ).DC) owia nhama wɔ 100V to 500V DC wɔ zero alternating-current zero-crossing beae a ɛtwam; twe a wɔtwe an MC4 plug apart under load twetwe a ɛkɔ so ** .3,000°C (5,400°F) plasma arc** a ɛma plastic connector a ɛwɔ wo nsa a wode nsateaa ahyɛ mu no yɛ hyew na ɛde ogya to ɔdan atifi nnua so.
  3. Sɛnea wobɛkum array voltage dwoodwoo wɔ sikani 30 mu: Sɛ wowɔ IMO / MidNite Solar Two-Pole PV Rotary Isolator anaa High-Voltage PV Breaker a wɔahyɛ no yiye, a wɔayɛ no polarized** a, fa kɔ OFF na ɛyɛ. Sɛ wususuw sɛ wo controller no ayɛ shorted wɔ mu anaasɛ wowɔ bare nkutoo a MC4 plugs, tow tarp a emu yɛ duru a ɛnyɛ nea ɛda adi, kuntu a ɛkɔ so, anaasɛ krataa a ɛyɛ tratraa wɔ panel BAKO pɛ so wɔ wo series string no mu (anaasɛ twɛn kosi sɛ ade bɛsa); shading one panel drops string current to near zero sɛnea ɛbɛyɛ a wubetumi abue PV disconnect no dwoodwoo na woayɛ rewire array no.
  4. Sɔ hwɛ sɛ wo MPPT Charge Controller no wɔ mu kɛkɛ anaa "Non-Destructive Over-Voltage Lockout" ANAA sɛ PV Input MOSFET ahorow a ɛwɔ mu no yɛ "Blown Short-Circuit".
  5. Sɛ wɔtwa PV array no mu fi controller inputs no mu pɛ a (PV+ ne PV-), fa wo dijitaal multimeter no si DC Volts ( .V===) na susuw wɔ owia nhama a wɔabue a efi ɔdan atifi ba no so: sɛ akenkan no wɔ wo controller no soro a ɛyɛ den no atifi a (e.g., > 100V on a Victron 100/50, > 150V on a 150/35, or > 250V on a 250/100), cold weather pushed your array over the cliff.
  6. Next, switch your multimeter to Continuity / Resistance (Ohms Ω) na susuw wɔ nea wɔatwa mu no so ** .PV+ ne PV- screw terminals wɔ MPPT controller no ankasa so**: sɛ mita no bɔ biep a 0.0 to 2.0 Ohms (dead short) anaasɛ nea PV terminal kyerɛ battery voltage a ɛreba akyi afi owia hyɛn gyinabea ahorow no mu, emu input ahobammɔ MOSFETs/TVS diode no de wɔn ho bɔɔ afɔre na ɛsɛ sɛ wɔsesa controller no.
  7. DROP WO ARRAY VOLTAGE BY 50% wɔ 15 MINUTES mu mprempren ara denam rewiring wo panels fi All-Series (4S or 3S) mu Series-Parallel (2S2P) (or bypassing 1 panel out of the string).
  8. You do not need to buy a new higher-voltage charge controller to get your cabin power back today. Simply walk out to the solar array (with the PV breaker OFF and one panel tarped), unplug the MC4 jumpers connecting your 4 panels in series (4S = 4 x Voc), and reconnect them as 2 parallel strings of 2 panels in series (2S2P = 2 x Voc, . 2 x Amps), or simply unplug 1 panel (dropping 4S down to 3S). Cutting a 4S string to 3S anaasɛ 2S2P immediately drops your sub-zero voltage by 25% to 50%, bringing your controller right back into its safe operating window while delivering the exact same wattage (Volts x Amps = Watts).
  9. IF YOUR LiFePO4 LITHIUM BATTERY IS AT 0 AMPS CHARGE BECAUSE OF 0°C (32°F) BMS LOW-TEMPERATURE LOCKOUT: Warm the Battery Core Above +5°C (41°F) Before Allowing Any Solar or Generator Charge.
  10. Never try to "trick" or bypass a frozen LiFePO4 BMS to force charging below 0°C (32°F). Charging a frozen lithium iron phosphate cell causes dendritic metallic lithium plating on the graphite anode, permanently destroying capacity and creating an internal short-circuit fire hazard.
  11. Note that while you cannot CHARGE a LiFePO4 battery below 0°C (32°F), the BMS still allows you to DISCHARGE (draw power out of) the battery down to -20°C (-4°F). Use that remaining battery discharge power (or a small insulated hot-water bottle / 12V silicone warming pad inside an XPS foam cooler box) to warm the battery cells above +5°C (41°F), at which point the BMS automatically closes its charge relay and accepts full solar current again.

Why Never to Disconnect Battery Wires From a Live MPPT Controller BEFORE Disconnecting the Solar Panels First

Every off-grid electrician memorizes the golden sequence of solar switching: * TO SHUT DOWN: (1) Turn OFF the Solar (PV) Disconnect FIRST -> (2) Turn OFF the Battery Disconnect SECOND. * TO POWER UP: (1) Turn ON the Battery Disconnect FIRST -> (2) Turn ON the Solar (PV) Disconnect SECOND. Why? An MPPT charge controller relies on the battery connection both to auto-detect system voltage (12V / 24V / 48V) and to sink energy from its internal buck-converter inductor. If you disconnect the battery while 140 Volts of freezing winter sunlight is still pouring into the PV terminals, the inductor voltage spikes uncontrollably inside the controller, frying the logic board and sending an unregulated voltage spike straight into your 12V/24V/48V cabin appliances and inverter.

Decision tree: Diagnosing a winter morning off-grid solar outage

flowchart TD
    A["Sunny Sub-Zero Winter Morning: Zero Solar Charging Watts Entering Battery Bank"] --> B{"Check MPPT Charge Controller Screen / Bluetooth App & Smell for Burnt Electronics"}
    B -->|"1. Controller Displays 'PV Over-Voltage' OR Screen Dead / Burnt Smell"| C["AWURADE-WUMA Voc OVER-VOLTAGE EVENT: Silicon panel voltage kɔɔ soro 15% koduu 25% wɔ sub-zero awɔw mu, ɛboroo MPPT Max PV Input Limit (e.g., 100V, 150V, anaa 250V)"]
    C --> D["Kata 1 panel ne esum tarp -> Dane PV Isolator OFF -> Sua PV open-circuit voltage & hwɛ MPPT PV + / PV- terminals sɛ awu tiawa"]
    D --> E["IMMEDIATE FIELD FIX: Rewire panels fi 4S kɔ 3S anaa 2S2P na ama string Voc akɔ fam 25%-50% (Sesa MPPT sɛ input MOSFETs tiawa a)"]
    B -->|"2. MPPT Kyerɛ PV Voltage a Ɛyɛ Daa (e.g., 85V) & 'Bulk/Float' ANAA '0.0A' Bere a Battery Wɔ Ase 0°C (32°F) ."| F["LiFePO4 BMS LOW-TEMPERATURE CHARGE PROTECTION (LTCP) LOCKOUT: Battery mu temp sensor yɛ < 0°C (32°F), a esiw charge current a ɛba mu nyinaa kwan"]
    F --> G["MMƆ HƆ: Fa batere hyɛ 50 mm XPS foam adaka a wɔabɔ ho ban a ɛwɔ 12V ɔhyew pad anaa nsuo a ɛyɛ hyew nkotoku a wɔatoto mu kosi sɛ core temp > +5°C (41°F)"]
    B -->|"3. PV Voltage = 0V ne Battery BMS nyinaa Awu koraa (0.0V wɔ Terminals) ."| H["BMS UNDER-VOLTAGE SLEEP LOCKOUT: Battery no asɛe anadwo biako -> BMS buee discharge FETs -> MPPT hweree ahoɔden"]
    H --> I["Dane PV Breaker OFF -> Jump-start/Wake BMS a 12V/24V/48V bench supply, kar jumper pack, anaa 9V battery wɔ terminals so -> Dane Battery ON -> Dane PV ON"]

Abɔde mu nneɛma ne akontaabu: Nea enti a owia ahoɔden mfiri ahorow no ahoɔden kɔ soro wɔ awɔw bere mu anɔpa a ɛnyɛ zero no

Owia ahoɔden afiri biara a wɔayɛ pɛn no wɔ nɔma abien a wɔatintim wɔ n’akyi Standard Test Conditions (STC, a wɔsɔɔ hwɛe wɔ 25°C / 77°F cell temperature) specification sticker a ɛkyerɛ awɔw bere mu nkwa:

  1. ** Voc (Open-Circuit Voltage at 25°C / 77°F): Voltage a ɛsen biara a panel no de ba bere a zero current resen (e.g., 37.5V, . 41.2V, anaa 49.5V).
  2. ** Temperature Coefficient of Voc (β_Voc): Wɔda no adi sɛ ** .-%/°C** (mpɛn pii no -0.28%/°C to -0.35%/°C ma monocrystalline panels) anaasɛ -mV/°C. Efisɛ abien no nyinaa nsusuwii ( .-0.34%/°C) ne ɔhyew a ɛkɔ fam wɔ ase hɔ 25°C (e.g., -25°C - 25°C = -50°C) yɛ akontaahyɛde a ɛnyɛ papa, sɛ wobɔ no bom a, ɛma massive POSITIVE voltage increase.
====================================================================================
     NEC ARTICLE 690.7 COLD-WEATHER SOLAR OPEN-CIRCUIT VOLTAGE (Voc) FORMULA
====================================================================================

   Cold_Voc = String_Voc_STC x [ 1 + ( (25°C - Record_Low_Temp_°C) x |Temp_Coeff_%| ) ]

   REAL-WORLD EXAMPLE THAT FRIES A 150V CHARGE CONTROLLER (e.g., Victron 150/35):
   * Setup: Four 400W panels wired in series (4S). Each panel has Voc = 37.0V at 25°C
     and a Temperature Coefficient of Voc = -0.34% / °C.
   * Summer Voltage at 25°C (77°F):
       4 panels x 37.0V = 148.0V  --> (Under 150V limit; works fine all summer)
   * Winter Morning at -25°C (-13°F) [A 50°C drop below 25°C STC]:
       Voltage Gain = 50°C drop x 0.34%/°C = +17.0% Voltage Increase
       Cold_Voc = 148.0V x 1.17 = 173.16 VOLTS DC
   * RESULT: At 07:30 AM on a -25°C morning, 173.2V hits a 150V-rated MPPT controller,
     exceeding the absolute 150V MOSFET breakdown rating by 23.2 Volts and frying it.
====================================================================================

Quick-Reference NEC 690.7 Awɔw-Wim tebea Voc Multiplier Table (Na Maximum Ahobammɔ Ahuhuro Ahama Voc) .

Wɔ U.S. Ɔman Ɛlektrik Mmara (NEC Table 690.7(A)), Canada anyinam ahoɔden Mmara (CEC Section 64), ne IEC 62548, sɛ wunni wo panel no temperature coefficient sheet pɛpɛɛpɛ wɔ w’anim a, bɔ wo total string no mmɔho Voc (at 25°C) denam awɔw-ɔhyew nteɛso factor a ɛyɛ ahyɛde a ɛwɔ ase ha no so, anaasɛ hwɛ hu ara sɛ wo rated 25°C ahoma Voc ɛntra "Max Safe" no da 25°C Ahoma Voc" column ma wo controller kɛseɛ:

Kyerɛw Awɔw Bere mu Ɔhyew a Ɛba Fam Ɔhyew a Ɛkɔ Ase 25°C (77°F) STC NEC 690.7 Awɔw Voc Multiplier ( .0.35%/°C) . Max Ahobammɔ 25°C Ahoma Voc ma obi a ** .100V MPPT** Max Ahobammɔ 25°C Ahoma Voc ma obi a ** .150V MPPT** Max Ahobammɔ 25°C Ahoma Voc ma obi a ** .250V MPPT** Max Ahobammɔ 25°C Ahoma Voc ma obi a ** .450V MPPT**
** +10°C to +5°C (50°F to 41°F) (Mpoano a Ɛyɛ Dwo) 15°C to 20°C gyae mu ** x 1.06 ( ) .+6%) . 94.0 V 141.0 V 235.0 V 424.0 V
** 0°C to -4°C (32°F to 24°F) (Hann a Ɛyɛ Nwini) 25°C to 29°C gyae mu ** x 1.10 ( ) .+10%) . 90.9 V 136.0 V 227.0 V 409.0 V
** -5°C to -9°C (23°F to 16°F) (Nwini a ɛyɛ mmerɛw) 30°C to 34°C gyae mu ** x 1.12 ( ) .+12%) . 89.2 V 133.9 V 223.2 V 401.7 V
** -10°C to -14°C (14°F to 7°F) (Awɔw Bere a Ɛyɛ Nwini) 35°C to 39°C gyae mu ** x 1.14 ( ) .+14%) . 87.7 V 131.5 V 219.2 V 394.7 V
** -15°C to -19°C (5°F to -2°F) (U.S. Atifi fam / UK Mmepɔw / EU) 40°C to 44°C gyae mu ** x 1.16 ( ) .+16%) . 86.2 V 129.3 V 215.5 V 387.9 V
** -20°C to -24°C (-4°F to -11°F) (Bepɔw / Atifi Mfinimfini Atɔe) 45°C to 49°C gyae mu ** x 1.18 ( ) .+18%) . 84.7 V 127.1 V 211.8 V 381.3 V
** -25°C to -29°C (-13°F to -20°F) (Rockies / New England / Canada) 50°C to 54°C gyae mu ** x 1.20 ( ) .+20%) . 83.3 V 125.0 V 208.3 V 375.0 V
** -30°C to -35°C (-22°F to -31°F) (Sub-Arctic / Alpine a ɛkorɔn) 55°C to 60°C gyae mu ** x 1.23 ( ) .+23%) . 81.3 V 121.9 V 203.2 V 365.8 V
** -40°C (-40°F) (Alaska Mfinimfini / Yukon / Canada Atifi fam) 65°C gyae mu ** x 1.25 ( ) .+25%) . ** 80.0 V ** ** 120.0 V ** ** 200.0 V ** ** 360.0 V **

Nea enti a... LiFePO4 BMS Lockout + Snow Albedo Effect ma owia apuei yɛ bere pɔtee a edi nkogu

Homesteaders pii bisa sɛ: "Twɛn: sɛ owia pue na MPPT no fi ase twe current pɛ a, so array voltage no nkɔ fam ntɛm ara mfi Open-Circuit Voltage (Voc = 41V/panel) kɔ fam kosi Operating Power Voltage ( .Vmp = 33V/panel)?" na woayɛ.

Wɔ awɔw bere mu no, yiw: sɛ owia hann bɔ panels no so ara pɛ a, MPPT no twe current kɔ battery no mu, na ɛtwe array no kɔ fam kɔ Vmp. Awɔw bere mu no, afiri abien siw saa nsu a ɛtɔ no ano:

  1. Afiri 1: Wo LiFePO4 Battery BMS Wɔ mu 0°C (32°F) Charge Lockout: Esiane sɛ wo battery bank no yɛɛ nwini wɔ freezing ase anadwo biako nti, battery no mu BMS abue ne charge switch. Efisɛ batere no pow sɛ ebegye mpo 0.1 Amps of charge, MPPT controller no ntumi mfa solar panels no nkɔ fam nkɔ Vmp na ɛyɛ. Owia ahoɔden nhyehyɛe no te stranded wɔ 100% unloaded Open-Circuit Voltage (Voc) anɔpa nyinaa wɔ awɔw bere mu owia a ano yɛ den mu.
  2. Afiri 2: "Mununkum-Edge & Sukyerɛmma-Albedo Irradiance Spikes" (1,200+ W/m²): Bere a owia nkwammoaa no da so ara yɛ nsukyenee-nwini wɔ -25°C (-13°F) ansa na owia no benya bere ama ahwehwɛ a ɛyɛ tumm no ayɛ hyew no, owia hann a ɛba fam no da sukyerɛmma fitaa a ɛyɛ foforo a ɛwɔ fam (sukyerɛmma albedo = 0.80 kosi 0.90) no dan bere koro mu a owia hann tẽẽ bɔ nnua a wɔasensɛn no. Eyi ma owia hann a ɛhyerɛn no yɛ kɛse wɔ soro 1,200 Watts/m², de foforo ka ho 2% to 3% logarithmic voltage boost wɔ awɔw-ɔhyew spike no atifi.

Emergency Field Fix 1: Sɛnea wobɛfa wire wo solar array no afi 4S to 2S2P (anaasɛ 3S) wɔ simma 15 mu

Sɛ wo solar string no reyɛ over-volting wo controller (anaasɛ sɛ wode controller foforo ahyɛ mu nkyɛe na ɛho hia sɛ wode ɔdan atifi ahoɔden no ba fam ntɛm ara a wontɔ waya foforo mfi ɔdan no atifi nkɔ cabin no mu) a, san hyehyɛ MC4 wɔn a wohuruw wɔ owia ahoɔden a wɔde hyɛ mu no akyi:

====================================================================================
     REWIRING A 4-PANEL ARRAY FROM "4S" (OVER-VOLT) TO "2S2P" (WINTER-SAFE)
====================================================================================

 [DANGEROUS IN WINTER: 4S (4 Panels in Series)]
   * Each Panel: 400W, Voc = 38V (at 25°C), Imp = 10.5A
   * Summer Voc = 4 x 38V = 152V | Winter (-25°C) Voc = 152V x 1.20 = 182.4V (FRIES 150V MPPT)

   (+) <--- [Panel 1] --- [Panel 2] --- [Panel 3] --- [Panel 4] ---> (-)

 ------------------------------------------------------------------------------------

 [WINTER-SAFE FIELD FIX A: 3S (Simply Unplug & Bypass 1 Panel, Takes 2 Minutes)]
   * Unplug Panel 4 and connect the negative home-run lead directly to Panel 3 (-).
   * Summer Voc = 3 x 38V = 114V | Winter (-25°C) Voc = 114V x 1.20 = 136.8V (100% SAFE < 150V)

   (+) <--- [Panel 1] --- [Panel 2] --- [Panel 3] ---> (-)    [Panel 4: Disconnected]

 ------------------------------------------------------------------------------------

 [WINTER-SAFE FIELD FIX B: 2S2P (2 Series Strings in Parallel, Keeps 100% of 1,600W)]
   * Pair Panel 1 + Panel 2 in series (String A = 76V STC).
   * Pair Panel 3 + Panel 4 in series (String B = 76V STC).
   * Combine String A and String B using a pair of $12 MC4 Parallel Y-Branch Connectors.
   * Winter (-25°C) Voc = 76V x 1.20 = 91.2 VOLTS DC | Current = 21.0 Amps (100% SAFE)

            +-- [Panel 1] --- [Panel 2] --+
   (+) <====| (MC4 Y-Branch)              |====> (-) To Cabin MPPT
            +-- [Panel 3] --- [Panel 4] --+
====================================================================================

(Wire Gauge Check Bere a Woresakra afi 4S to 2S2P: Efisɛ nsakrae fi 4S to 2S2P twa wo voltage mu fã na ɛma wo current fi 10.5 Amps to 21.0 Amps, hwɛ sɛ kɔbere waya a ɛretu fi wo array combiner no so akɔ wo MPPT no so no yɛ anyɛ yiye koraa no ** .10 AWG (6 mm²)**, a wɔde ahyɛ mu ma 30 Amps, na hwɛ sɛ ahama abien no mu biara nhia nea ɛboro a 15A/20A MC4 fuse a ɛwɔ nkyerɛwde mu.)

Emergency Field Fix 2: Sɛ obi nyan a LiFePO4 battery a wɔde ahyɛ mu 0°C (32°F) BMS awɔw mu lockout (anaasɛ 0V da)

Sɛ ɔhyew a ɛwɔ batere dan a ɛnyɛ hyew mu, camper van kar dan, anaa ɔdan no mu fam kɔ ​​fam sen awɔw a, ** .LiFePO4 (Lithium Iron Phosphate)** battery bank betumi atoto wo mu wɔ akwan soronko abien so. Hu lockout a wowɔ ansa na wode wo nsa aka terminals no:

Asɛm A: BMS "Ɔhyew a Ɛba Fam Charge Ahobammɔ (LTCP)" (Battery Powers Lights/Inverter Fine, But Refuses to Charge) .

  • Nea ɛrekɔ so: Wo mu LiFePO4 batere (Battle Born, SOK, Epoch, EG4, Trophy, LiTime, Chins, Renogy), NTC thermistor ketewaa bi a wɔde teyp abɔ aluminium cell casing no kenkan wɔ ase ha ** .0°C to +2°C (32°F to 35.6°F)** na ɛyɛ. Sɛnea ɛbɛyɛ a wobesiw dade lithium plating ano no, BMS no dum ne Charge MOSFET bere a ogyaw ne Discharge MOSFET no ON (efisɛ LiFePO4 nkwammoaa betumi agyae dwoodwoo akɔ fam akodu -20°C / -4°F).
  • Dɛn nti na BMS "Hysteresis" ma ɛkɔ so to mu kosi sɛ +5°C (41°F): BMS board dodow no ara hwehwɛ sɛ nkwammoaa mu hyew san kɔ soro kodu ** .+5°C (41°F)** ( ) .a 5°C hysteresis buffer) ansa na charge switch no asan asɔ bio. Nea enye koraa no, efisɛ 100Ah LiFePO4 batere mu duru yɛ kilogram 11 (25 lbs) a ɛyɛ hyew a ɛyɛ den, sɛ mpo mframa a ɛwɔ dan no mu no yɛ hyew kodu 10°C (50°F) awiabere no, batere a ɛte fam a awɔw wom no mu ntini no tra hɔ -1°C (30°F) nnɔnhwerew 6 foforo, na wɔsɛee awɔw bere mu owia mfɛnsere tiawa no nyinaa.
  • 3 Safe Field Akwan a Wɔfa so Ma Battery Core a ɛwɔ Atifi hɔ no yɛ hyew +5°C (41°F) Ɛnnɛ:
  • "Sealed Hot-Water Bottle + XPS Foam Cooler" Ɔkwan (Zero Electricity a Wɔde Di Dwuma): Fa wo LiFePO4 battery wɔ insulated cooler mu anaasɛ fa 50-millimeter ( ) twa ho hyia wɔ afã asia no nyinaa (titiriw ase ase).2-inch) XPS foam board a ɛyɛ pink/blue a ɛyɛ den*. Fa a ɛyɛ hyew hyɛ Nalgene nkotoku abien a emu yɛ duru anaa plastic nufusu nkuku a wɔatoto mu ma 45°C to 50°C (115°F to 122°F) nsu (nnoa nsuo da, na hwɛ sɛ nkatasoɔ no ntumi nkɔ terminals so), fa nsa mpopaho kyekyere, na fa to battery no nkyɛnkyɛn so yie wɔ adaka a wɔabɔ ho ban no mu. Wɔ simma 45 kosi 60 mu no, batere no mu thermistor no twam +5°C (41°F), BMS no klik to mu, na owia ahoɔden san fi ase charge.
  • The "High-Rate Inverter Discharge Self-Heating" Trick: Sɛ wo battery da so ara wɔ 30% kosi 50% State of Charge (SoC), fa batere no kyekyere nna kotoku anaa foam insulation mu denneennen na dane 500W kosi 1,000W AC adesoa a emu yɛ duru wɔ wo inverter no so (such as an electric kettle, toaster, or hair dryer) de simma 10 kosi 15 na ɛyɛ adwuma. Nyɛeɛ 40 to 80 Amps efi awɔw mu LiFePO4 battery ma emu hyew a ɛko tia (I²R ɔhyew a ɛwɔ nkwammoaa a thermistor no te no mu pɛɛ) bere a ɛrema afiri bi a mfaso wɔ so ahoɔden.
  • Fa Thermostat-Controlled bi si hɔ 12V / 24V / 48V Silicone Battery Heating Pad (30W to 60W): Sɛ wopɛ sɛ wosiesie no daa a, fa adhesive-backed 12V silicone rubber tank/battery heating pad a wɔde ahyɛ mu no twetwe 5°C ON / 15°C OFF thermostat a ɛwɔ battery no ase wɔ foam adaka a wɔabɔ ho ban mu, a wɔde nhama ahyɛ mu ma enti ɛtwetwe ahoɔden bere a wɔde ahoɔden ahyɛ owia ahoɔden afiri no mu awiabere nkutoo.

Asɛm B: BMS "Nkitahodi a Ɛba Fam (LVD / . 0.0V Sleep Mode)" (Terminals Read 0.0V to 2.1V and MPPT Will Not Turn On) .

  • Nea ɛrekɔ so: Wo battery drained down to 0% SoC (< 10.0V wɔ batere a ɛyɛ 12V so, . < 20.0V wɔ 24V so, anaasɛ < 40.0V wɔ 48V) so anadwo biako, enti BMS no buee abien no nyinaa Discharge ne Charge switches no de siee nkwammoaa no. Sɛ adekyeeɛ du a, wo MPPT solar controller no awu ɛfiri sɛ MPPT controller dodoɔ no ara twe wɔn amemene mu ahoɔden firi Battery terminals no mu, ƐNYƐ Solar terminals, ne ɛfiri sɛ MPPT no hunu 0.0V wɔ battery nhama no so no, ɛpow sɛ ɛbɛsɔre na ɛde charge pulse bi akɔma BMS no.
  • Sɛnea Wobɛnyan obi a Ɔda 0.0V LiFePO4 BMS wɔ Sikɔne 60 mu:
  • Dane Owia no (PV) Ɔbubufoɔ OFF deɛ ɛdi kan.
  • Fa abɔnten DC ahoɔden fibea (matching your nominal system voltage: 12V, 24V, or 48V) atwa battery a ɛda hɔ no (+) ne (-) terminals 5 kosi 10 seconds de kanyan BMS chip no:
    • Sɛ wode Lithium Kar Jump-Starter Pack a Wotumi Fa Di Dwuma (mia... " Manual Override / Boost " button wɔ jump pack no so enti ɛma 12V mpo bere a wɔde abɔ a 0.0V terminal), .
    • Sɛ wode Kar Alternator / 12V Lead-Acid Kar Battery a jumper cables di dwuma simma 10,
    • Sɛ wode AC-Powered Battery Charger a ɛwɔ... "0V Lithium Force-Mode / Supply Mode" ( ) .such as a Victron BlueSmart IP65 or NOCO Genius in Force Mode), ANAASƐ
    • Batere Abien a Ɛyɛ 9-Volt Wusiw-Detector a Wɔatwitwa Wɔ Ntoatoaso Mu a Wɔde Di Dwuma (18V ɛnam 12V kanea bɔlɔb current-limiter) a wɔde kaa 12V BMS terminals bere tiaa bi so kyɛe ara kwa ma MPPT controller screen no hyerɛn.
  • Ntɛm ara a MPPT controller screen no hyerɛn na ehu sɛ 12V / 24V / 48V battery bank, dannan Owia no (PV) Ɔbubufoɔ ON: MPPT no bɛfa no ntɛm ara na abɔ battery no charge.

Mma Nnyaw Lead-Acid Batere a ɛda hɔ kwa a enni ahoɔden da wɔ Sub-Zero Cold (Ɛyɛ Freeze Solid na Ɛpaapae wɔ -7°C / 19°F)

Hyɛ awɔw bere mu abɔde mu nneɛma a ɛne ne ho bɔ abira pɛpɛɛpɛ a ɛda Lead-Acid (AGM / Gel / Flooded) ne Lithium ( .LiFePO4) batere ahorow: . * BI LiFePO4 Lithium Battery ƐNYƐ nwini na ɛpaapae wɔ -25°C (-13°F) bere mpo a ɛda mpan (0% SoC) efisɛ ne electrolyte yɛ organic carbonate solvent, nanso ɛnsɛ sɛ wobɔ no charge wɔ ase DA 0°C (32°F) na ɛyɛ. * A Kɔbere-Acid ( .AGM / Flooded) Battery yɛ nea ɛne no bɔ abira pɛpɛɛpɛ: sɛ lead-acid battery no yɛ 100% a, ne sulphuric acid electrolyte no tra nsu mu kodu ** .-60°C (-76°F)** deɛ; nanso, bere a wɔtow batere a ɛwɔ lead-acid mu kɔ 0% SoC, sulphuric acid no dan nsu a ɛkame ayɛ sɛ ɛho tew na ɛyɛ nwini ma ɛbɛyɛ nsukyenee a ɛyɛ den wɔ -7°C (+19°F), a ɛpaapae plastic kotoku no mu na ɛbɔ kɔbere mprɛte no mu. Mfa lead-acid batere a ayɛ nwini na ɛbɔ (ɛbɛpae ne hydrogen gas) da.

Fa Official Free Online MPPT String Sizers no di dwuma Ansa na Awɔw Bere Aba

Ansa na osutɔbere mu nwini a emu yɛ den a edi kan no bɛba no, fa wo solar panel model nɔma ne wo mantam no awɔw bere mu hyew a ɛba fam sen biara no hyɛ Victron MPPT Calculator ( ) a wontua hwee no mu.victronenergy.com/mppt-calculator) anaa MidNite Owia Classic Nhama Sizer. Bere nyinaa yɛ wo owia nhama no sɛnea ɛbɛyɛ a akontaabu Awɔw Voc at -30°C (-22°F) anyɛ yiye koraa no, tra hɔ 10% below wo charge controller no ahoɔden a ɛsen biara koraa (e.g., never exceed 135V calculated Cold Voc on a 150V controller, or 225V Cold Voc on a 250V controller).

Mpɔtam hɔ ntɛmpɛ nɔma ne anyinam ahoɔden ahobammɔ gyinapɛn ahorow

Sɛ owia ahoɔden controller, DC combiner box, anaa battery bank a ɛwɔ ahoɔden boro so mu gya hyew anaasɛ ɛma wusiw a awuduru wom (hydrogen fluoride / phosphoryl fluoride efi lithium electrolyte a ɛrehyew mu), tu fi hɔ ntɛm ara na wo ne wɔn a wɔhwɛ ntɛmpɛ so no nni nkitaho:

  • Amerika ne Canada:
  • Ogya anaa Aduruyɛ mu Ntɛmntɛm: Frɛ 911 na ɛyɛ. Ka kyerɛ nea ɔde kɔma no sɛ: "Yɛwɔ off-grid photovoltaic DC electrical / lithium-iron-phosphate battery ogya; DC owia nhama a ahoɔden kɛse kɔ so nya ahoɔden bere biara a owia bɛhyerɛn."
  • Ɛlektrik Mmara a Ɛfa Ho: U.S. Ɔman Ɛlektrik Mmara (NFPA 70 / NEC Article 690.7, Maximum Photovoltaic System Voltage & Table 690.7(A) Temperature Correction Factors) ne Canada anyinam ahoɔden Mmara (CSA C22.1 Section 64-210) na ɛyɛ.
  • Aman Nkabom & Europa Aman Nkabom:
  • Ntɛmntɛm: Frɛ 999 (UK) anaa ** .112** (EU) na ɛwɔ hɔ.
  • Gyinapɛn a Wɔde Di Dwuma: BS 7671 (IET Wiring Regulations Section 712), MCS (Microgeneration Certification Scheme MIS 3002, hyɛ sɛ wɔmfa akontaabu nhyehyɛe Voc at -10°C anaasɛ -15°C anyɛ yiye koraa no egyina UK mmepɔw so postcode so), ne IEC 62548 (Photovoltaic Arrays - Design Requirements) na ɛyɛ.
  • Australia ne New Zealand:
  • Ntɛmntɛm: Frɛ 000 (Australia) anaa ** .111** (New Zealand) na ɛwɔ hɔ.
  • Gyinapɛn a Wɔde Di Dwuma: AS/NZS 5033 (Installation and Safety Requirements for Photovoltaic (PV) Arrays, Clause 3.1 & Equation 4.1 Open-Circuit Voltage Temperature Correction) ne AS/NZS 5139 (Battery Energy Storage Systems) na ɛyɛ.
  • Sɛ wopɛ dodow a egye ntɛmpɛ wɔ aman bɛboro 190 mu a, hwɛ nɔma ahorow a egye ntɛmpɛ.

Nsɛm a wɔtaa bisa

Adɛn nti na me solar panels no yɛɛ higher voltage wɔ freezing so -20°C (-4°F) awɔw bere mu anɔpa sen sɛnea wɔyɛ wɔ July mfinimfini?

Photovoltaic owia nkwammoaa yɛ silicon semiconductor diodes a ne band-gap ahoɔden trɛw bere a ɔhyew so tew no. Nea ɛnte sɛ batere a ɛhwere ahoɔden bere a awɔw wom no, owia ahoɔden mfiri nya ahoɔden bɛyɛ ɔha biara mu nkyem 0.30 kosi ɔha biara mu 0.40 wɔ open-circuit voltage (Voc) mu wɔ digrii Celsius 1 biara a ɛkɔ fam sen wɔn ɔhyew a ɛwɔ adwumayɛbea sɔhwɛ a ɛyɛ digrii Celsius 25 (digrii Fahrenheit 77) no mu. Wɔ awɔw bere mu anɔpa a ɛyɛ -25°C (-13°F) (50°C a ɛkɔ fam sen 25°C) no, wo owia nhyehyɛe no ma ahoɔden a ɛkɔ soro bɛyɛ ɔha biara mu nkyem 17 kosi 20 sen ne din krataa sticker, na ɛnyɛ den sɛ ɛbɛpia ahama a ɛyɛ volt 135 a ahobammɔ wom wɔ awɔw bere mu a ɛboro volt 160 na ayɛ MPPT charge controller a ɛwɔ volt 150.

Ɔkwan bɛn so na LiFePO4 battery BMS lockout a wɔahyɛ no nwini no boa ma me solar charge controller no hyew bere a owia apue?

Wɔ wim tebea a ɛyɛ hyew mu no, sɛ anɔpa owia no bɔ wo solar panels no ara pɛ a, MPPT charge controller no fi ase twe current de charge battery no, na ɛno twetwe owia array no voltage no kɔ fam ntɛm ara fi ne Open-Circuit Voltage (Voc) a ɛkorɔn no so kɔ ne Operating Power Voltage (Vmp, bɛyɛ ɔha biara mu nkyem 18 a ɛba fam) no so. Nanso, sɛ wo LiFePO4 batere no yɛɛ nwini sen 0°C (32°F) anadwo biako a, ne Battery Management System (BMS) a ɛwɔ mu no siw charge current nyinaa ano. Esiane sɛ adesoa biara nni panel ahorow no so nti, owia ahoɔden nhyehyɛe no kɔ so yɛ Open-Circuit Voltage (Voc) a wɔmfa nneɛma nhyɛ mu ɔha biara mu nkyem 100 bere a awɔw ne sukyerɛmma a ɛdannan a ɛba fam no pia saa ahoɔden no twa controller no hardware anohyeto no so.

Mɛyɛ dɛn atumi atew me solar array no awɔw bere mu ahoɔden so nnɛ a mentɔ charge controller foforo?

Nea edi kan no, fa tarp a ɛnyɛ hann kata ahama biara mu panel biako so anaasɛ twɛn kosi sɛ owia akɔtɔ, afei dum wo PV disconnect breaker no. Wubetumi de MC4 plugs a ɛwɔ hɔ dedaw a ɛwɔ wo panel ahorow no akyi no so atew wo string voltage so ɔha biara mu nkyem 25 kosi 50 ntɛm ara: (1) yi panel biako fi 4-panel series string mu ma ɛdan 3-panel string (3S, twa voltage no ɔha biara mu nkyem 25), anaasɛ (2) fa nhama 4-panel series string (4S) ayɛ no nhama abien a ɛne ne ho di nsɛ a ɛwɔ panel abien a ɛtoatoa so (2S2P) de $12 MC4 Y-branch connectors abien di dwuma, a ɛtwa voltage mu fã bere a ɛkora wo charging wattage ɔha biara mu nkyem 100 so.

Dɛn nti na asiane wom sɛ wubeyi MC4 owia ahoɔden nhama a ɛwɔ ɔdan no atifi bere a owia rehyerɛn no?

Owia nhama yɛ adwuma wɔ Direct Current (DC) a ahoɔden kɛse wom so, a ɛnte sɛ ofie 60 Hz Alternating Current (AC) no, ɛntwa zero volts da. Sɛ wotwe MC4 connector bi tetew mu (anaasɛ wubue AC breaker a wɔanhyɛ da) bere a owia hann rebɔ panels no na current resen a, anyinam ahoɔden no huruw fa mframa a ɛwɔ mu no mu sɛ plasma arc a ɛkɔ so yɛ digrii Celsius 3,000 (degree-Fahrenheit 5,400) a ɛrennum ne ho, na ɛma connector no nwene, ɛhyew wo nsa, na ɔdan atifi a wɔde hyew nneɛma. Bere nyinaa tow tarp anaa kuntu a ɛyɛ tumm gu anyɛ yiye koraa no panel biako so wɔ ahama no mu ansa na woayi MC4 nkitahodi biara afi mu.

Dɛn nti na me LiFePO4 lithium battery no renkɔ soro nsen 0°C (32°F), na metumi akɔ so atwe ahoɔden afi mu de ayɛ me cabin akanea?

Sɛ Lithium Iron Phosphate (LiFePO4) nkwammoaa bi nnu 0°C (32°F) a, lithium ions ntumi nkɔ (nkɔ) graphite anode no mu ntɛmntɛm sɛnea ɛsɛ bere a wɔrebɔ charge no; mmom no, wɔboaboa ano wɔ soro sɛ dade lithium nnade a ano yɛ nnam (lithium plating) a ɛsɛe batere no daa na ebetumi atow nea ɛpaapae no mu ma ogya atɔ. Nea ɛbɛyɛ na wɔasiw eyi ano no, batere no BMS no dum charge a ɛba fam sen 0°C no. Nanso, sɛ wode batere no fi mu a, ɛmma lithium nhyɛ mu, enti wo BMS no da so ara ma wotumi twe ahoɔden fi batere no mu kɔ fam kodu -20°C (-4°F). Kɛkɛ a, ma batere no yɛ hyew wɔ foam adaka a wɔabɔ ho ban mu a ɛboro +5°C (41°F) na woasan afi ase abɔ.

Sɛ me MPPT charge controller no da "PV Over-Voltage" (te sɛ Victron Error #20) adi a, dɛn na ɛba: so controller no asɛe koraa?

Egyina sɛnea voltage no foro kɔɔ soro koduu anohyeto no so. Controllers a ɛkorɔn pii (te sɛ Victron SmartSolar anaa MidNite Classic units) kanyan software a ɛbɔ ho ban a wɔto mu na ɛda over-voltage mfomso code adi bere a PV voltage twa 100.0V, 150.0V, anaa 250.0V ntɛm ara no; sɛ voltage no boro rating no so volts 1 kosi 3 pɛ a current zero sen a, twa panels no mu na wɔde wiring array no kɔ voltage a ɛba fam so no taa ma controller no san nya ahoɔden a hwee nto mu. Nanso, sɛ awɔw a ɛba fam sen zero no piaa ahoɔden no 10 kosi 25 volts twaa rating no so a, silicon MOSFET ahorow a ɛwɔ mu ne ahobammɔ diode ahorow no taa bɔ short-circuit, na ɛhwehwɛ sɛ wɔsesa controller no.

Akwankyerɛ ahorow a ɛfa ho

Fibea ne aban akwankyerɛ

  • Ɔman Ogya Ho Banbɔ Fekuw (NFPA 70 / National Electrical Code - NEC Article 690.7): Maximum Photovoltaic System Voltage akontabuo, Low-Ambient ɔhyew Open-Circuit Voltage (Voc) Nneɛma a Ɛma Nteɛso ( .Table 690.7(A)), ne DC Arc-Fault Isolation Ahwehwɛde ahorow.
  • Amanaman Ntam Ɛlektrik Mfiridwuma Bagua (IEC 62548 & . IEC 62109-1): Mfonini ahoɔden (PV) Arrays - Design Ahwehwɛde (Awɔw-Wim Tebea Voc Multiplier Equations) ne Ahobammɔ a ɛwɔ Power Converters a wɔde bedi dwuma wɔ Photovoltaic Power Systems mu.
  • Canada Gyinapɛn Fekuw (CSA C22.1 Canadian Electrical Code Section 64-210) & Gyinapɛn Australia (AS/NZS 5033): Sub-Zero Ɔhyew Nteɛso Multipliers ma Crystalline Silicon Modules (Down to -40°C / -40°F).
  • Ɔman no Ahoɔden a Wɔyɛ Foforo Nhwehwɛmubea (NREL) & IEEE Photovoltaic Abenfo Nhyiam: Sub-Zero Anodic Lithium Plating Mfiri wɔ LiFePO4 Nkwammoaa a Ɛwɔ Ase hɔ 0°C (32°F), BMS Ɔhyew Hysteresis, ne Sukyerɛmma-Albedo Over-Irradiance Transients.
  • Victron Ahoɔden, MidNite Owia, & OutBack Tumi Engineering Mfiridwuma Bulletins: MPPT Charge Controller Maximum Input Voltage Ceilings (100V / 150V / 250V / 450V), Mfomso #19/#20 Over-Voltage Diagnostics, ne Battery-First Power-Up Ntoatoaso.