I'm operating in an area with an average 5.5 peak solar hours per day (panels tilted to the area's latitude facing 180° due south).
So, if I assume 95% charging efficiency of the MPPT solar charge controller, then I get the following for numbers of Watts/Panels I need to fully charge a single 100Ah/1280Wh LiFePo4 battery:
(1280Wh/5.5h)/95% efficiency = 245 Watts, or ≈ 250 Watts of PV panels.
Correct?
Of course, I'm not draining and recharging that battery 100% every day. But if I were, I'd need 250 Watts of panels.
If I was using about 50% capacity daily, then I'd only need 125W of panels to keep that same battery recharged. At 80% usage (keeping battery state of charge between 10% and 90%), I'd need about 240W of panels (.8 * 250W= 200W).
So, if I assume 95% charging efficiency of the MPPT solar charge controller, then I get the following for numbers of Watts/Panels I need to fully charge a single 100Ah/1280Wh LiFePo4 battery:
(1280Wh/5.5h)/95% efficiency = 245 Watts, or ≈ 250 Watts of PV panels.
Correct?
Of course, I'm not draining and recharging that battery 100% every day. But if I were, I'd need 250 Watts of panels.
If I was using about 50% capacity daily, then I'd only need 125W of panels to keep that same battery recharged. At 80% usage (keeping battery state of charge between 10% and 90%), I'd need about 240W of panels (.8 * 250W= 200W).
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