Solar Charge Controller MPPT Over-Voltage Fry in Sub-Zero Cold, Voc Temperature Coefficient Math, le BMS Low-Temp Charge Lockout¶

Ho kena ka har'a ntlo ea hau e se nang marang-rang, ntlo ea motlakase ea letsatsi, van ea likampong, kapa lehaeng le lenyenyane, hoseng ho hotle ha mariha 07:30 ho fofonela lisebelisoa tsa elektroniki tse chesitsoeng, bona skrine e shoeleng kapa "Error #20 / PV Over-Voltage" ho Tracking ea hau ea Boholo ba Power Point (MPPT) selaoli sa tefo ea letsatsi* (Victron SmartSolar, Renogy Rover, MidNite Classic, Epever, OutBack FM80, or EG4/Sol-Ark hybrid inverter), 'me u fumane LiFePO4 (Lithium Iron Phosphate) banka ea betri e notletsoe ka ntle 0 Amps ea ho lefisa ke e 'ngoe ea maemo a tšohanyetso a mariha a senyang ka ho fetesisa le a sa utloisisoang ka matla a kantle ho grid. Melao e 'meli e ikemetseng ea tlhaho e thulana hoseng ho batang ha leqhoa: (1) Ho fapana le hoo e batlang e le lisebelisoa tse ling tsa motlakase, silicon photovoltaic (PV) liphanele tsa letsatsi li hlahisa matla a HIGHER haholo ha a ntse a bata haholo (rising by 0.30% to 0.40% for every 1°C drop below 25°C / 77°F), le **(2) Lithium Iron Phosphate (LiFePO4) lisele tsa betri li na le bothata ba tšepe ea lithium plating e ke keng ea fetoloa haeba e lefisoa ka tlase 0°C (32°F), ho qobella tsamaiso ea bona ea ka hare ea Battery Management (BMS) ho bula litefiso tsa SFETs (Low-Temperature Charge Protection - LTCP).

Ha liketsahalo tseo tse peli li etsahala ka nako e le 'ngoe ha letsatsi le chaba ka -25°C (-13°F) hoseng, hao o hatsetse LiFePO4 betri BMS e thibela phallo eohle ea hona joale (holding the solar array at 100% Open-Circuit Voltage - Voc e nang le lefela ho theola motlakase), ha serame se ka tlase ho zero hammoho le lehloa la albedo reflection e khanna khoele ea letsatsi e lekantsoeng hantle. 136 Volts ka Phupu ka kotloloho ho fihlela 163 Volts, hang-hang e otla ka har'a 150V Silicon MOSFET siling ea molaoli oa hau oa MPPT le ho khutsufatsa molaoli ka leru la mosi. Haeba motlakase oa letsatsi, inverter, kapa lithium battery bank e ntse e tsuba, e chesa, kapa e tuka hona joale, tsoa hang-hang 'me u letsetse nomoro ea hau ea tšohanyetso ea lehae.911 United States le Canada, 112 ho pholletsa le European Union, 999 United Kingdom, 000 Australia) kapa buisana dinomoro tsa tshohanyetso. Bakeng sa maemo a tšohanyetso a amanang le motlakase le mariha a kantle ho grid, bona over-grid inverter overload, controller charger, le 12V/24V/48V battery bank circuit short, ho hloleha ha matla a letsatsi, metsi le litšila, le mello ea motlakase.

Etsa sena hona joale¶

1. HAEBA MOLAOLI OA HAO WA SOLAR CHARGE A BONTŠA AALAMO EA HO FETAe.g., Victron Error #19 / #20 / #24, Epever E08, Renogy E08), HO TLANYA KA POTLAKO, KAPA HO NKUKA HO CHESA HOSENG HO TSAMAEA: Lahlela Lefifi kapa Kobo Holim'a Phanele e le 'Ngoe ho E 'ngoe le E 'ngoe Series String PELE U Ama Any Unrated Breaker kapa MC4 Connector.
2. ** LE KA mohla u se ke ua pola marulelo a marulelo MC4 sehokelo sa letsatsi kapa bula sesebelisoa sa DC se theko e tlaase se sa polarized ha khanya ea letsatsi e ntse e otla liphanele 'me hona joale ho phalla (or if the MPPT input FETs have shorted together).** Hona joale ka ho toba (DC) likhoele tsa letsatsi ka 100V to 500V DC ho ba le noto e fapanyetsanang-hajoale lefela-ho tšela ntlha; ho hula ka MC4 plug e arohaneng tlas'a mojaro e hula e tsoelang pele 3,000°C (5,400°F) plasma arc e qhibilihisang sehokelo sa polasetiki se letsohong la hau la liatlana ebe se chesa maballo a marulelo.
3. Mokhoa oa ho bolaea li-voltage tse ngata ka mokhoa o sireletsehileng ka metsotsoana e 30: Haeba u na le sekhahla se lekantsoeng hantle, se polarized IMO / MidNite Solar Two-Pole PV Rotary Isolator kapa High-Voltage PV Breaker, e tlose ho OFF. Haeba u belaela hore molaoli oa hau o khutsufetse ka hare kapa u na le letho MC4 li-plug, ** lahlela tarp e boima e opaque, kobo e sisinyehang, kapa sekotoana sa khateboto e bataletseng holim'a phanele e LE NNGWE feela letotong la likhoele tsa hau ** (kapa ema ho fihlela ka shoalane); ho shading phanele e le 'ngoe ho theola khoele ea hona joale ho ea haufi le zero e le hore u ka bula PV ka mokhoa o sireletsehileng ebe u kopanya sehlopha hape.
4. Lekola hore na MPPT Charge Controller ea hau e kene feela "Non-Destructive Over-Voltage Lockout" KAPA haeba PV Input MOSFETs e "Blown Short-Circuit".
5. Hang ha sehlopha sa PV se khaotsoe ho tsoa ho lisebelisoa tsa molaoli (PV+ le PV-), seta multimeter ea hau ea dijithale ho ** DC Volts (V===)** 'me u lekanye lithapo tse bulehileng tsa letsatsi tse tsoang marulelong: haeba 'malo o ka holim'a siling e thata ea molaoli oa hau (e.g., > 100V on a Victron 100/50, > 150V on a 150/35, or > 250V on a 250/100), meteo ea leholimo e batang e sutumelitse sehlopha sa hau holim'a lefika.
6. E latelang, fetola multimeter ea hau ho ** Tsoelo-pele / Resistance (Ohms Ω)** le ho lekanya ho pholletsa le sehokelo PV+ le PV- Screw terminals ho MPPT controller ka boeona: haeba metara e lla 0.0 to 2.0 Ohms (dead short) kapa ea PV terminal e bonts'a matla a betri a khutla ka morao ho tsoa likoung tsa letsatsi, ts'ireletso ea kahare ea MOSFETs/TVS diode e itetse 'me molaoli o tlameha ho nkeloa sebaka.
7. Theolela ARRAY VOLTAGE EA HAO KA 50% KA METSOTSO E 15 hona joale ka ho hokahanya liphanele tsa hau ho tloha All-Series (4S or 3S) ho kena Series-Parallel (2S2P) (kapa ho feta phanele e le 1 ka ntle ho khoele).
8. Ha u**** ha u hloke ho reka selaoli se secha sa tjhaja e phahameng haholo ho fumana motlakase oa khabin ea hau kajeno. Tsamaea feela ho ea ho solar array (ka sekheo sa PV OFF le phanele e le 'ngoe e kentsoeng ka tarped), e tlose MC4 li-jumpers tse hokahanyang liphanele tsa 4 ka letoto (4S = 4 x Voc), 'me u li hokahanye hape e le 2 likhoele tse bapileng tsa liphanele tse 2 ka letoto (2S2P = 2 x Voc, 2 x Amps), kapa feela tlolla phanele e le 1 (dropping 4S down to 3S). Ho khaola a 4S khoele ho 3S kapa 2S2P hang-hang e theola voltage ea hau ea sub-zero ka 25% ho isa ho 50%, e khutlisetsa molaoli oa hau fensetereng ea eona e bolokehileng ea ts'ebetso ha e ntse e fana ka metsi a ts'oanang hantle (Volts x Amps = Watts).
9. HAEBA HAO LiFePO4 LITHIUM BATTERE E HLAHALA 0 AMPS TEFO LEBAKA 0°C (32°F) BMS LOW-TEMPERATURE LOCKOUT: Futhumatsa Battery Core Ka Holimo +5°C (41°F) Pele o Dumella Tefiso efe kapa efe ya Solar kapa Jenereithara.
10. Le ka mohla u se ke ua leka ho "qhekella" kapa ho feta sebaka se leqhoa LiFePO4 BMS ho qobella ho tjhaja ka tlase 0°C (32°F). Ho lefisa sele ea lithium iron phosphate e leqhoa ho baka dendritic metallic lithium plating holim'a anode ea graphite, ho senya ka ho sa feleng bokhoni le ho baka kotsi ea mollo oa ka hare oa potoloho e khutšoanyane.
11. Ela hloko hore le ha o ** o ke ke oa LETSA** a LiFePO4 betri ka tlase 0°C (32°F), BMS e ntse e u lumella ho TLOA (draw power out of) betri e theohela ho -20°C (-4°F). Sebelisa matla a setseng a ho qhala betri (kapa botlolo e nyane e kentsoeng ka metsi a chesang / 12V silicone ea ho futhumala ka har'a lebokose le pholileng la foam la XPS) ho futhumatsa lisele tsa betri tse kaholimo +5°C (41°F), ka nako eo BMS e ikoalla ka bo eona relay ea eona ebe e amohela matla a letsatsi a felletseng hape.

Sefate sa ho etsa qeto: Ho hlahloba hoseng ha mariha ho tsoa ho grid ea letsatsi¶

flowchart TD
    A["Hoseng ha Mariha a Sunny Sub-Zero: Li-Watts tsa ho Chaja Solar tse Kenang Bankeng ea Betri"] --> B{"Sheba Skrine sa Molaoli oa Charge ea MPPT / Sesebelisoa sa Bluetooth le Monko bakeng sa lisebelisoa tsa elektroniki tse chesitsoeng"}
    B -->|"1. Controller Displays 'PV Over-Voltage' KAPA Screen Dead / Burnt Smell"| C["KETSAHALO E FETILENG EA MOSEBETSI OA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO EA TŠEBELETSO E FETILENG: Matla a silicon e phahame ka 15% ho isa ho 25% mohatselang o ka tlase ho zero, o feta MPPT Max PV Input Limit (mohlala, 100V, 150V, kapa 250V)"]
    C --> D["Koahela phanele e le 'ngoe ka tarp e lefifi -> Tlosa PV Isolator TIMA -> Lekanya motlakase oa potoloho ea PV e bulehileng 'me u hlahlobe liteishene tsa MPPT PV+/PV bakeng sa bokhutšoanyane bo shoeleng."]
    D --> E["IMMEDIATE FIELD FIX: Khutlisetsa liphanele ho tloha ho 4S ho ea ho 3S kapa 2S2P ho theola mohala oa Voc ka 25% -50% (Fetola MPPT haeba li-MOSFET tse kenyang li khutsufalitsoe)"]
    B -->|"2. MPPT e Bontša Matla a Tloaelehileng a PV (mohlala, 85V) & 'Bulk/Float' KAPA '0.0A' Ha Betri e Tlase ho 0°C (32°F)"| F["LiFePO4 BMS LOW-TEMPERATURE CHARGE PROTECTION (LTCP) LOCKOUT: Sensor ya mocheso o ka hare wa betri ke <0°C (32°F), e thibela tefiso yohle e kenang hona jwale."]
    F --> G["U SE KE U TLA FELA TŠEBELETSO: Beha betri ka har'a lebokose la foam la 50 mm XPS le nang le pompo ea ho futhumatsa ea 12V kapa libotlolo tsa metsi a futhumetseng tse koetsoeng ho fihlela mocheso oa mantlha > +5 ° C (41 ° F)"]
    B -->|"3. Ka bobeli PV Voltage = 0V le Battery BMS E Shoele ka ho feletseng (0.0V ho Terminals)"| H["BMS UNDER-VOLTAGE SLEEP LOCKOUT: Betri e ile ea ntšoa ka bosiu bo le bong -> BMS e ile ea bula li-FET tsa ho ntša metsi -> MPPT e felloa ke matla"]
    H --> I["Tlosa PV Breaker -> Tloha-qala/Tsosa BMS ka phepelo ea benche ea 12V/24V/48V, pakete ea jumper ea koloi, kapa betri ea 9V ho pholletsa le liteishene -> Bulela Betri -> Bulela PV"]

Fisiks le lipalo: Hobaneng liphanele tsa letsatsi li phahama ka matla a motlakase hoseng ha mariha a tlase ho zero¶

Phanele e 'ngoe le e 'ngoe ea letsatsi e kileng ea etsoa e na le linomoro tse peli tse hatisitsoeng ka morao Maemo a Tloaelehileng a Teko (STC, lekoa ka 25°C / 77°F Mocheso oa selefouno) setikara se ikhethileng se laolang ho phela mariha:

1. Voc (Open-Circuit Voltage ho 25°C / 77°F): Matla a phahameng a matla ao phanele e a hlahisang ha noto e phalla (e.g., 37.5V, 41.2V, kapa 49.5V).
2. Temperature Coefficient of Voc (β_Voc): E hlalositsoe joalo ka -%/°C (hangata -0.28%/°C ho -0.35%/°C bakeng sa liphanele tsa monocrystalline) kapa -mV/°C. Hobane coefficient ka bobeli (-0.34%/°C) le mocheso o theoha ka tlase 25°C (e.g., -25°C - 25°C = -50°C) ke linomoro tse mpe, ho li atisa hammoho ho hlahisa ** keketseho e kholo ea motlakase oa POSITIVE **.

====================================================================================
     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 Cold-Weather Voc Multiplier Table (Le Maximum Safe Safe Summer String Voc)¶

Tlas'a U.S. Khoutu ea Naha ea Motlakase (NEC Table 690.7(A)), Khoutu ea Motlakase ea Canada (CEC Section 64), le IEC 62548, haeba u sena letlapa le nepahetseng la mocheso ka pel'a hau, atisa khoele ea hau kaofela. Voc (at 25°C) ka ntlha e tlamang ea tokiso ea mocheso o batang o ka tlase, kapa etsa bonnete ba hore ** o fane ka lintlha 25°C khoele Voc ha ho mohla e fetang "Max Safe 25°C Khoele Voc" kholomo ** bakeng sa boholo ba molaoli oa hau:

Ke hobane'ng ha LiFePO4 BMS Lockout + Snow Albedo Effect e etsa hore letsatsi le chabe e le nako e nepahetseng ea ho hloleha¶

Beng ba matlo ba bangata ba botsa: * "Ema: hang ha letsatsi le chaba 'me MPPT e qala ho hula hona joale, na motlakase ha o theohe hang-hang ho Open-Circuit Voltage (Voc = 41V/panel) ho theohela ho Operating Power Voltage (Vmp = 33V/panel)?"*

Lehlabuleng, e: hang ha khanya ea letsatsi e otla liphanele, MPPT e hula hona joale ka har'a betri, e hula letoto ho ea tlase. Vmp. Mariha, maraba a mabeli a thibela lerotholi leo:

1. Sefi sa 1: Hao LiFePO4 BMS ea Betri e kene 0°C (32°F) Ho Lockout ea Tefiso: Hobane banka ea hau ea betri e ile ea pholile ka tlas'a leqhoa ka bosiu bo le bong, BMS e ka hare ea betri e butse switch ea eona ea ho tjhaja. Hobane betri e hana ho amohela esita le 0.1 Amps ea tefiso, ** molaoli oa MPPT ha a khone ho kenya lisebelisoa tsa letsatsi ho ea ho Vmp. Sebaka sa mahlaseli a letsatsi se lutse se tsitsitse ho ** 100% e laotsoeng ea Open-Circuit Voltage (Voc) hoseng hohle letsatsing le chesang la mariha.
2. Sefi sa 2: "Cloud-Edge & Snow-Albedo Irradiance Spikes" (1,200+ W/m²): Ha lisele tsa letsatsi li ntse li bata haholo -25°C (-13°F) pele letsatsi le e-ba le nako ea ho futhumatsa khalase e lefifi, mahlaseli a letsatsi a tlaase a hlahisa lehloa le lesoeu le lesoeu fatše (** snow albedo = 0.80 ho 0.90 **) ka nako e le 'ngoe le letsatsi le tobileng le otlang liphanele tse sekame. Sena se phahamisa mahlaseli a letsatsi ka holimo 1,200 Watts/m², ho eketsa e 'ngoe 2% to 3% logarithmic voltage e eketseha ka holim'a sekhahla sa mocheso o batang.

Emergency Field Fix 1: Mokhoa oa ho hokahanya lisebelisoa tsa hau tsa letsatsi ho tloha 4S ho 2S2P (kapa 3S) ka metsotso e 15¶

Haeba khoele ea hau ea letsatsi e ntse e otla ka matla ho feta molaoli oa hau (kapa haeba u sa tsoa kenya mochine o mocha 'me u hloka ho theola motlakase oa marulelo hang-hang ntle le ho reka terata e ncha ho tloha marulelong ho ea kamoreng), tsosolosa MC4 li-jumpers tse ka morao ho rack ea letsatsi:

====================================================================================
     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] --+
====================================================================================

• (Tlhahlobo ea Wire Gauge ha u tloha 4S ho 2S2P: Hobane ho tloha 4S ho 2S2P e fokotsa motlakase oa hau ka halofo 'me e imena habeli ho tloha hona joale 10.5 Amps ho 21.0 Amps, netefatsa hore terata ea koporo e mathang ho tloha ho sehlopha sa pokello ea hau ho ea ho MPPT ea hau bonyane ke 10 AWG (6 mm²), e lekantsoeng 30 Amps, 'me u hlahlobe hore ha ho khoele e hlokang ho feta a 15A/20A moleng oa MC4 fuse.)*

Tšimo ea Tšohanyetso Tokiso ea 2: Ho tsoha a LiFePO4 betri e qabeletsoe ka hare 0°C (32°F) BMS e batang ea ho koala (kapa 0V robala)¶

Ha lithempereichara ka har'a betere e sa futhumatsang, karache ea camper van, kapa mokatong oa kamore e theohela tlase ho leqhoa, LiFePO4 (Lithium Iron Phosphate) banka ea betri e ka u koala ka litsela tse peli tse fapaneng. Hlalosa hore na u na le senotlolo sefe pele u tšoara li-terminals:

Nyeoe A: BMS "Tsireletso ea Tefiso e tlase ea Mocheso (LTCP)" (Battery Powers Lights/Inverter Fine, But Refuses to Charge)¶

• Ho etsahalang: Ka hare ho hao LiFePO4 betri (Battle Born, SOK, Epoch, EG4, Trophy, LiTime, Chins, Renogy), thermistor e nyane ea NTC e kentsoeng ka har'a casing ea sele ea aluminium e baleha ka tlase 0°C to +2°C (32°F to 35.6°F). Ho thibela metallic lithium plating, BMS e tima Charge MOSFET ha e ntse e siea Discharge MOSFET ea eona e butse ON (hobane LiFePO4 lisele li ka hlalosa ka mokhoa o sireletsehileng ho ea ho -20°C / -4°F).
• Hobaneng BMS "Hysteresis" e boloka e notletsoe kantle ho fihlela +5°C (41°F): Bongata ba liboto tsa BMS bo hloka hore mocheso oa selefouno o phahame ho fihla ho +5°C (41°F)(a 5°C hysteresis buffer) pele sesebelisoa sa ho tjhaja se bulela hape. Ho hobe le ho feta, hobane 100Ah LiFePO4 betri e boima ba lik'hilograma tse 11 (25 lbs) ea boima bo botenya ba mocheso, leha moea oa ntlo o futhumala ho fihlela 10°C (50°F) mots'ehare, mokokotlo oa betri o lutse mokatong o batang o lula o le teng -1°C (30°F) bakeng sa lihora tse ling tse 6, ho senya fensetere eohle e khutšoanyane ea mariha ea letsatsi.
• ** Mekhoa e 3 e Sireletsehileng ea Tšimo ea ho futhumatsa Betri ea Bohareng ka holimo +5°C (41°F) Kajeno:**
• Mokhoa oa "Botlolo ea Metsi a Chesang a Tiisitsoeng + XPS Foam Cooler" (Motlakase oa Zero o Sebelisitsoe): Beha sebaka sa hau. LiFePO4 betri ka hare ho pholileng e insulated kapa e pota-potile ka mahlakoreng 'ohle a tšeletseng (haholo-holo ka tlas'a tlase) ka 50-millimeters (2-inch) boto e thata e pinki/putsoa ea XPS ea foam. Tlatsa libotlolo tse peli tsa Nalgene tse boima kapa lijeke tsa lebese tsa polasetiki tse tiisitsoeng ka mofuthu 45°C to 50°C (115°F to 122°F) water (le ka mohla a se ke a belisa metsi, 'me u netefatse hore likatiba ha li khone ho lutla holim'a li-terminals), li phuthele ka thaole ea letsoho, 'me u li kenye hantle mahlakoreng a betri ka har'a lebokose la insulated. Ka nako ea metsotso e 45 ho isa ho e 60, thermistor ea kahare ea betri ea tšela +5°C (41°F), ho tobetsa BMS ho koetsoe, 'me ho tjhaja letsatsi ho qala hape.
• Leqheka la "High-Rate Inverter Discharge Self-Heating": Haeba betri ea hau e ntse e na le 30% ho isa ho 50% State of Charge (SoC), phuthela betri ka thata ka mokotleng oa ho robala kapa ho kenya foam ebe o bulela moroalo o boima oa **500W ho isa ho 1,000W AC ** ho inverter ea hau (such as an electric kettle, toaster, or hair dryer) bakeng sa metsotso e 10 ho isa ho e 15. Ho taka 40 to 80 Amps ho tsoa mohatselang LiFePO4 betri e hlahisa mocheso o ka hare oa ho hanyetsa (I²R ho futhumatsa hantle ka har'a lisele moo thermistor e lutseng teng) ha u ntse u matlafatsa sesebelisoa sa bohlokoa.
• Kenya Thermostat-Laolang 12V / 24V / 48V Silicone Battery Heating Pad (30W to 60W): Bakeng sa tokiso ea ka ho sa feleng, thellela sekhomaretsi se nang le sekhomaretsi 12V tanka ea rabara ea silicone/pete ea ho futhumatsa betere e nang le ntho e hahelletsoeng ka hare. 5°C ON / 15°C OFF thermostat ka tlas'a betri ka har'a lebokose la foam le insulated, le nang le mehala e etsang hore e hule matla ha feela liphanele tsa letsatsi li matlafalitsoe motšehare.

Case B: BMS "Low-Voltage Disconnect (LVD / 0.0V Sleep Mode)" (Terminals Read 0.0V to 2.1V and MPPT Will Not Turn On)¶

• Ho etsahalang: Betri ya hao e theohile ho fihlela 0% SoC (< 10.0V ka betri ea 12V, < 20.0V ka 24V, kapa < 40.0V ka 48V) bosiu bo le bong, kahoo BMS e ile ea bula bobeli switch ea Discharge le Charge ho boloka lisele. Ha hoseng ho fihla, motlakase oa hau oa letsatsi oa MPPT o shoele hobane **balaoli ba bangata ba MPPT ba hula matla a boko ba bona ho li-terminals tsa Battery, ESENG liteishene tsa Solar **, le hobane MPPT e bona 0.0V lithapong tsa betri, e hana ho tsoha le ho romela molumo oa ho tjhaja ho tsosa BMS.
• Mokhoa oa ho Tsosa Boroko 0.0V LiFePO4 BMS ka Metsotsoana e 60:
• Fetola Solar (PV) Seqhenqha OFF ea pele.
• Kenya mohloli oa motlakase oa kantle oa DC (matching your nominal system voltage: 12V, 24V, or 48V) ho pholletsa le betri e robetseng (+) le (-) liteishene tsa metsotsoana e 5 ho isa ho e 10 ho tsosa chip ea BMS:
  • Ho Sebelisa Portable Lithium Car Jump-Starter Pack (tobetsa konopo ea " Manual Override / Boost " konopo ho jump pack kahoo e hlahisa 12V leha e hokahane le a 0.0V terminal),
  • Ho sebelisa Vehicle Alternator / 12V Lead-Acid Car Bettery e nang le likhoele tsa jumper metsotsoana e 10,
  • Ho sebelisa AC-Powered Bettery Charger e nang le "0V Lithium Force-Mode / Supply Mode"(such as a Victron BlueSmart IP65 or NOCO Genius in Force Mode), KAPA
  • Ho Sebelisa libeteri tse peli tsa 9-Volt-Smoke-Detector tse Kentsoeng ka Letoto (18V ka 12V lightbulb current-limiter) e ile ea ama hakhutšoanyane ho litheminale tsa 12V BMS nako e telele e lekaneng hore skrine ea MPPT e ka bonesoa.
• Hang-hang skrine ea molaoli oa MPPT e tla khantša 'me e lemoha 12V / 24V / 48V banka ea betri, ** fetola Solar (PV) Seqhenqha ON**: MPPT e tla nka taolo hanghang ebe e tjhaja betri.

Linomoro tsa libaka tsa tšohanyetso le litekanyetso tsa polokeho ea motlakase¶

Haeba selaoli sa tefiso ea letsatsi se matla haholo, lebokose le kopanyang la DC, kapa banka ea betri e ka tšoara mollo kapa e ntša mosi o chefo (hydrogen fluoride / phosphoryl fluoride ho tloha ho chesa lithium electrolyte), tsoa hang-hang 'me u ikopanye le litšebeletso tsa tšohanyetso:

• United States le Canada:
• Mollo kapa Boemo ba Tšohanyetso ba Bongaka: Letsetsa 911. Bolella motho ea tsamaisang thepa: "Re na le "off-grid photovoltaic DC ea motlakase / lithium-iron-phosphate battery fire; lithapo tsa motlakase tsa DC tse matla haholo li lula li le matla neng kapa neng ha letsatsi le chaba."
• Likhoutu tse sebetsang tsa Motlakase: U.S. Khoutu ea Naha ea Motlakase (NFPA 70 / NEC Article 690.7, Maximum Photovoltaic System Voltage & Table 690.7(A) Temperature Correction Factors) le Khoutu ea Motlakase ea Canada (CSA C22.1 Section 64-210).
• United Kingdom le European Union:
• Tshohanyetso: Letsetsa 999 (UK) kapa 112 (EU).
• Maemo a Sebetsang: BS 7671 (IET Wiring Regulations Section 712), MCS (Microgeneration Certification Scheme MIS 3002, e laela ho bala lethathamo Voc ho -10°C kapa -15°C bonyane ho latela khoutu ea poso ea UK highland), le IEC 62548 (Photovoltaic Arrays - Design Requirements).
• Australia le New Zealand:
• Tshohanyetso: Letsetsa 000 (Australia) kapa 111 (New Zealand).
• Maemo a Sebetsang: AS/NZS 5033 (Installation and Safety Requirements for Photovoltaic (PV) Arrays, Clause 3.1 & Equation 4.1 Open-Circuit Voltage Temperature Correction) le AS/NZS 5139 (Battery Energy Storage Systems).
• Bakeng sa linomoro tsa maemo a tšohanyetso linaheng tse fetang 190, ikopanye dinomoro tsa tshohanyetso.

Lipotso tse botsoang khafetsa¶

Ke hobane'ng ha liphanele tsa ka tsa letsatsi li ile tsa hlahisa * matla a holimo * holim'a leqhoa le leqhoa -20°C (-4°F) hoseng ha mariha ho feta bohareng ba Phupu?¶

Lisele tsa letsatsi tsa Photovoltaic ke li-silicon semiconductor diode tseo matla a tsona a nang le lekhalo le ntseng le eketseha ha mocheso o fokotseha. Ho fapana le libeteri tse lahleheloang ke motlakase ha ho bata, liphanele tsa letsatsi li fumana hoo e ka bang liperesente tse 0.30 ho isa ho 0.40 liperesenteng tsa "open-circuit voltage" (Voc) bakeng sa ho theoha ho hong le ho hong ha likhato tse 1 tsa Celsius ka tlase ho mocheso oa feme ea 25-degree-Celsius (77-degree-Fahrenheit). Hoseng ha -25 ° C (-13 ° F) mariha (ho theoha ha 50 ° C ka tlase ho 25 ° C), mahlaseli a letsatsi a hau a hlahisa hoo e ka bang 17 ho 20 lekholong ea matla a phahameng ho feta setikara sa lebitso, 'me a sutumelletsa khoele ea 135-volt e sireletsehileng ea lehlabula ka holimo ho 160 volts le ho halika mochine oa motlakase oa MPPT 150.

Ho notleloa ha betri ea BMS ea LiFePO4 e hatselitsoeng e kenya letsoho joang ho beheng selaoli sa ka sa tjhaja ea letsatsi ha letsatsi le chaba?¶

Boemong ba leholimo bo futhumetseng, hang ha letsatsi la hoseng le otla liphanele tsa hau tsa letsatsi, molaoli oa tefo oa MPPT o qala ho hula hona joale ho tjhaja betri, eo hang-hang e hulang matla a mahlaseli a letsatsi ho tloha holimo ho Open-Circuit Voltage (Voc) ho ea tlaase ea Operating Power Voltage (Vmp, hoo e ka bang karolo ea 18 lekholong e tlase). Leha ho le joalo, haeba betri ea hau ea LiFePO4 e ne e pholile ka tlase ho 0°C (32°F) bosiu bo le bong, Battery Management System (BMS) ea eona e ka hare e thibela ho tjhaja ha hona jwale. Ka moroalo oa zero holim'a liphanele, khanya ea letsatsi e lula e tsitsitse ho 100% e laotsoeng ea Open-Circuit Voltage (Voc) ha serame se ka tlase ho zero le lehloa li sutumelletsa matla ao ho feta moeli oa lisebelisoa tsa molaoli.

Nka theola motlakase oa ka oa mariha oa solar array joang kajeno ntle le ho reka selaoli se secha sa tefiso?¶

Ntlha ea pele, koahela phanele e le 'ngoe khoeleng e' ngoe le e 'ngoe ka tarp e khanyang kapa u eme ho fihlela ha letsatsi le likela, ebe u tima sekhechana sa hau sa PV. Hang-hang u ka theola motlakase oa khoele ea hau ka liperesente tse 25 ho isa ho tse 50 u sebelisa li-plug tsa MC4 tse ka morao ho liphanele tsa hau: e ka ba (1) ntša thapo e le 'ngoe ho tloha khoeleng ea 4-phanele ho e fetola khoele ea 3-panel (3S, ho khaola voltage ka liperesente tse 25), kapa (2) ho kenya hape mohala oa 4-panel letoto la likhoele tse peli (4S2) ho sebelisa likhoele tse peli $12 MC4 lihokelo tsa lekala la Y, tse fokotsang voltage ka halofo ha li ntse li boloka liperesente tse 100 tsa motlakase oa hau oa ho tjhaja.

Hobaneng ho le kotsi ho ntša sehokelo sa letsatsi sa MC4 marulelong ha letsatsi le chabile?¶

Lithapo tsa letsatsi li sebetsa ho Direct Current (DC) ea matla a phahameng, eo, ho fapana le ntlo ea 60 Hz Alternating Current (AC), ha e tšele li-volts tsa zero. Haeba u hula sehokelo sa MC4 ka thoko (kapa u bula sekhechana sa AC se sa tsitsang) ha khanya ea letsatsi e ntse e otla liphanele 'me hona joale ho ntse ho phalla, motlakase o tlola lekhalo la moea e le plasma e tsitsitseng ea 3,000-degree-Fahrenheit (5,400-degree-Fahrenheit) e ke keng ea tima, e qhibilihisa matsoho a hau, e qhibilihisa matsoho a hau. Kamehla lahlela terepe e lefifi kapa kobo bonyane holim'a phanele e le 'ngoe thapong pele u ntša sehokelo leha e le sefe sa MC4.

Hobaneng ha LiFePO4 lithium betri ea ka e sa tjhaje ka tlase ho 0°C (32°F), mme na nka ntse ke hula matla ho yona ho tsamaisa mabone a ntlo ya ka?¶

Ha sele ea Lithium Iron Phosphate (LiFePO4) e ka tlaase ho 0 ° C (32 ° F), li-ion tsa lithium ha li khone ho kena-kenana (ho kena ka har'a) graphite anode ka potlako nakong ea ho tjhaja; ho e-na le hoo, li bokellana holim'a metsi e le linale tse bohale tsa tšepe tsa lithium (lithium plating) tse senyang betri ka ho sa feleng 'me li ka phunya searola ho baka mollo. Ho thibela sena, BMS ea betri e koala ho tjhaja ka tlase ho 0°C. Leha ho le joalo, ho chacha ha ho bake lithium plating, kahoo BMS ea hau e ntse e u lumella ho ntša matla ka betri ho ea ho -20°C (-4°F). Feela futhumatsa betri ka har'a lebokose la foam le insulated ka holimo ho +5°C (41°F) hore o qale ho tjhaja.

Ho etsahala'ng haeba molaoli oa ka oa charger oa MPPT a bonts'a "PV Over-Voltage" (joalo ka Victron Error #20): na molaoli o senyehile ruri?¶

Ho itšetlehile ka hore na motlakase o nyolohile hakae ka holimo ho moeli. Balaoli ba bangata ba boleng bo phahameng (joaloka lihlopha tsa Victron SmartSolar kapa MidNite Classic) ba etsa hore ho be le ts'ebetso ea ts'ireletso ea software e thibelang 'me ba bonts'a khoutu ea phoso e feteletseng ea PV voltage cross cross 100.0V, 150.0V, kapa 250.0V; haeba motlakase o feta tekanyo ea 1 ho ea ho 3 volts e nang le zero ea hona joale e phallang, ho khaola liphanele le ho tsosolosa lihlopha ho ea ho motlakase o tlase hangata ho lumella molaoli hore a hlaphoheloe a sa senyeha. Leha ho le joalo, haeba serame se ka tlase ho zero se sutumelletsa motlakase oa 10 ho isa ho 25 volts ho feta tekanyo, li-silicon MOSFETs le li-diode tsa ts'ireletso li atisa ho foka li-circuit tse khutšoane, tse hlokang hore motho a nkeloe sebaka.

Litataiso tse amanang¶

• Inverter e ngata ea off-grid, molaoli oa tjhaja e chesitsoeng, le 12V/24V/48V betri ea potoloho e khuts'oane.
• Ho hloleha ha matla a letsatsi, metsi le matlakala a kantle ho grid
• Sekoba sa metsi se hatsetseng, se oeleng sa IBC, le purge ea airlock e fepetsoeng ka matla a khoheli.
• Mollo oa litente oa Propane Buddy Heater, carbon monoxide, le moea o batang oa leholimo oa bivy
• Mello ea motlakase

Mehloli le tataiso ea semmuso¶

• Mokhatlo oa Naha oa Tšireletso ea Mollo (NFPA 70 / National Electrical Code - NEC Article 690.7): Maximum Photovoltaic System Voltage Calculator, Low-Ambient Temperature Open-Circuit Voltage (Voc) Lintlha tsa Tokiso (Table 690.7(A)), le Litlhoko tsa ho Isolation tsa DC Arc-Fault.
• Khomishene ea Machabeng ea Motlakase (IEC 62548 & IEC 62109-1): *Photovoltaic (PV) Arrays - Litlhoko tsa Moqapi (Bata-Leholimo Voc Multiplier Equations) le Polokeho ea Bafetoleli ba Matla bakeng sa Tšebeliso ho Photovoltaic Power Systems *.
• Mokhatlo oa maemo a Canada (CSA C22.1 Canadian Electrical Code Section 64-210) & Standards Australia (AS/NZS 5033): * Li-multiplier tsa Tokiso ea Mocheso oa Sub-Zero bakeng sa Crystalline Silicon Modules (Down to -40°C / -40°F)*.
• Laboratori ea Naha ea Matla a Tsosolositsoeng (NREL) & IEEE Seboka sa Litsebi tsa Photovoltaic: Sub-Zero Anodic Lithium Plating Mechanisms ho LiFePO4 Lisele Ka tlase 0°C (32°F), BMS Thermal Hysteresis, le Snow-Albedo Over-Irradiance Transients.
• Victron Energy, MidNite Solar, & OutBack Power Engineering Bulletins: MPPT Charge Controller Maximum Input Voltage Ceilings (100V / 150V / 250V / 450V), Phoso #19/#20 Over-Voltage Diagnostics, le Battery-First Power-Up Sequencing.