Which size of solar panel can charge a 200ah battery?

There is a lot of information required for this but lets work with assumptions. Well, in how much time do you wish to charge it? Assumptions 1. Battery would be fully discharged or only 10% capacity would be remaining in battery. read more

Two 300 Wp panels will be able to fully charge a 12 V 200 Ah battery in 4 hours, that is, from zero to 100% charge. This is theoretical. Since the actual DOD (depth of discharge) is usually set at 70%, the time taken would be much lower, around 1 hour or so. read more

Assumptions 1. Battery would be fully discharged or only 10% capacity would be remaining in battery. read more

For example, some people are trying to recharge batteries for a trolling motor, boat, RV, house, electric scooter, backwoods cabin, etc., and they want it done in very short time, usually in just a few days. Assume you take a discharged 100-amp hour battery and charge it with a 30-watt solar panel under ideal summertime light conditions. read more

If you build (DIY) an 13.8V 10W solar panel with 25 solar cells (52x52mm) without solar modulators (no charge controller) you can push 0.7A current in the battery and it will charge from 50% to 100% in aprox 140 hours of sunlight. Or 20 days with full 7 hours sunlight. read more