Can a 100W solar panel charge a 100Ah battery?
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Sure, but it’s going to take a while.
100Ah•12vdc=1200W, so looks like 12 hours, but 100 watts is the MAXIMUM & there’s the angle of the sun & the panel to consider, efficiency too. Give it 24 hours.
Sure you can… In fact a 10W solar panel will recharge a 100Ah battery. Its gonna take a bit long, but certainly doable.
Even with a 100W panel, that’s about 5ish amps under full sun, so you’ll need to protect the battery from overcharge condition with a charge controller.
A typical 100Ah battery is used for fish trolling, marine starting, and some deep cycle applications. It’s a typical ‘battery on a rope’ you see at the big box stores that sell batteries.