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I have three old solar panels in my boat for a total of 105 W, and 2 cheap 85Ah marine deep cycle 12 V batteries. It copes with keeping a number of phones, rad

by kpil 8y ago

I have three old solar panels in my boat for a total of 105 W, and 2 cheap 85Ah marine deep cycle 12 V batteries. It copes with keeping a number of phones, radios, tablets and a small laptop charged, some moderate use of lights, an occasional run of a webasto diesel air heater, and continously powering a compressor driven fridge box. I think the batteries are one of the cheapest thing in my system.

joeyh 8y ago
Batteries are one of the most expensive parts of an offgrid PV system once you start looking at prices over decades. My 1.5kw solar panels and electronics cost $2k (self-installed) and will last 20+ years. To run the fridge on demand from batteries during the night and rainy days, I'd need something approaching the capacity of a powerwall, $6.6k every 10 years.