TreeSeeker wrote:
RvFNG76,
A 125w refer is going to draw roughly 1 amp on 120vac. That will be 12 amps on a 12vdc source and that is not even counting the draw of the converter. And remember the refer has to run 24hrs so at night it has to run only on battery power. For 8 hrs of darkness you would need 12amps x 8hrs = 96 amp hrs of battery power.
For a 120 amp hr battery you can only use half of that without damaging it. So you only get 60 amp hrs. But to charge the batteries back up you need to double the number of batteries since the refer draw continues even when the solar panels are charging. And I haven't even counted all the other battery draws.
The are reasons RVs come with gas refers.
There is a flaw with your math. You are assuming a 100% duty cycle for the fridge. This is not the case.
I run a dorm fridge, 110 watts. This comes out to 0.92 amps. It definitely is not 100% duty cycle, a typical fridge runs a 35% duty cycle. This means in 8 hours of overnight, so in my case that .92a that would be 11a on 12vdc isn't 88 amp hr, but just under 31. For his setup its not 96 amp hrs, but just under 34.
