How long Can My Battery Last my Fridge?

hmong2017
hmong2017 Registered Users Posts: 39 ✭✭
in Solar Beginners Corner #1
My batteries are taken and left at a shop for test. Theres a Line, so id take them until tomorrow noon. In the Meantime, I have a 12V system that is currently pumping my Pond waterfall. If I use those two 12V 100Ah battery and connect them both into 24V, I have 100Ah. How many hours can these two batteries last my fridge at night? 

My current 24V system is
- 8 of 260W 24V Sun Power Poly Solar Panels
- Combine Box 
- Charge Controller 80A MPPT
- 6 of 12V 200Ah Batteries Mighty Max Brand. Two connected into one to make 24V then parallel to get 600Ah
- Power Inverter 5000 Watt Aims Corp brand

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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #2
    It depends a lot on the fridge, use (like door opening or putting warm food in), and ambient conditions (hot, windy, etc).  A typical fridge might use about 1500 watt-hours in "normal" conditions.  A 100ah@24v bank is ~2400 watt-hours of storage, so running the fridge is likely to take the bank down to 50% or possibly lower state of charge overnight.  You might be able to get away with doing this very short term (assuming you get sun every day, or can otherwise charge every day), but the batteries won't be happy longer term.
    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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