# Solar Power Watts/Volts/Amps

• I have a 12v battery that is rated at 220ah.
• I have solar panels rated at 500 watts total.
• I'm using a MPPT charge controller rated for 12/24 volts

I only have a rudimentary understanding of electricity, so please forgive the elementary nature of these question that I hope you can help me work out:

Assuming we start at zero, and ignoring real-world inefficiencies...

1. If this is a 12v panel and it produces ~41 amps, would it take roughly 5.3 hours to fill up the battery?

2. If this is a 24v panel it produces ~21 amps, would it take roughly 11 hours to fill up the battery?

That seems counter-intuitive, but if "amps" = "the amount of electricity" I'm getting lost as to why that isn't true.

1. Is there any difference in usable power generation between 12 and 24 volt panels as long as they are at the same wattage?

2. Finally, if I have some amount of "amp hours" I'm trying to replace in a battery (let's say I ran that 220ah battery down to 110ah remaining and I want to recharge it), what's the formula for figuring out how many hours of sunlight I would need, if I have X watts worth of solar panels?