In Reply to: More Thoughts At Large - Battery & Solar Power posted by Tim Daley(MI) on September 01, 2019 at 04:07:52:
On my boat which has 2 six volt batteries making 12 volts, and one 12 volt battery for starting the engine. I could charge these batteries using the alternator on the engine. 40 amps at easy revs. But the engine needs to be running.
Or I could charge them with a wind turbine, or a towed alternator in the water. I do not have either. I use solar panels that have the ability to produce about 18 amps, but because of the angle of the dangle I usually get 11 to 12, but mostly 9.
9 amps over 8 hours is 72 amps and enough to keep the batteries charged.
Short version. The solar panels need to send the amps to a battery, thru a rectifier.
Some devices will have a minimum volt requirement, often about 11.5 volts. Then they shut off, or trigger an alarm. In the case of a light, go out.