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just starting
just starting Registered Users Posts: 235 ✭✭✭
in Off Grid Solar & Battery Systems #1
so i have 3 72 cell 300 watt panels, im going to use 3 strings and have a 36v input. ocv is 46.8, 20' to midnite kid marine with epanel mini 125 with a samlex pst1524 for the inverter and a 25amp iota, i was thinking of a 400 ah bank, it gets cold here, battery high temp on agm is 73º f today.i will have this out side in a small power shed. no heat so I lose about 30% of battery due to temps. any sugestions would like fla this time to check electrolite
200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #2
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    Not sure what suggestions you're looking for. With warm panels and cold batteries, you may have trouble getting EQ, or maybe even Vbs with an mppt controller.

    The potential current from the panels may be a bit low, but with Iotas I assume tou have a generator and don't mind using it some.

    As for AGM vs flooded, I'm partial to flooded for the same reason - to check SG and electrolyte level. That said, I can see a use for AGM ( eg low self discharge) in some applications.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • just starting
    just starting Registered Users Posts: 235 ✭✭✭
    #3
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    i have a 1500w array drops to 55v at lowest 2p3s mpv is 31.7 so not worried about heat loss.on panel i live at 10200 in heavy aspen so never gets above 85º here mostly in the 70º range or lower, olny going to use it for 2 freezers one as a fridge about .85kwh per day, and washer and drier after float
    200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
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  • just starting
    just starting Registered Users Posts: 235 ✭✭✭
    #4
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    so any fla between 300- 400 ah in a 24v setup.
    200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #5
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    Okay. I thought you had 3 panels, but if you have 6 (2Px3s) that should work. 4xL16 type flooded would likely be a good fit.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • just starting
    just starting Registered Users Posts: 235 ✭✭✭
    edited August 2017 #6
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    Its my main system that has six panels. You were right. 3 panels I hope I can still eq. The panel specs are 300w 44.8 voc mpv is 36.3 8.69 and 8.20 - I use agm on my main system but i get paranoid the last 2 years have made 81.2 kAH and 2261 kwh thru the xw 60-150 controller but no shunt or bm to say what was just for the batterys.
    200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #7
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    Even at reasonable ambient temps (eg 70°f), with no breeze the panels get pretty hot in the sun, which will bring voltage down some. You could look for a normal cell operating temperature Vmp rating to get a sense of what to expect.

    It may work with 3 panels in parallel some/most of the time depending on bank and panel temps. The altitude should help. You'd have to try and see at your installation to really know.

    If you find voltage too low you could rewire and use 2 panels in series, or add a 4th and wire 2s2p? Some flooded ( thinking Rolls) want highish Vabs which you might want to avoid for this application.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • just starting
    just starting Registered Users Posts: 235 ✭✭✭
    #8
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    Thank you
    200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
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