Sarahps33 wrote:
For example my laptop says 20v/2.25a on the charger.
You choose a bad example ! That is the MAXIMUM amount that charger can OUTPUT ! As 2oldmen said that is 45 watts. There is some power lost inside the charger so 50-60 watts is a reasonable expectation. Now if that charger was plugged into a 120V AC outlet it would draw about 1/2A.
If you have a charger that plugs into 12V DC, it would draw about 5A.
Also, once your laptop is fully charged and turned off, it will only draw a fraction of what I stated.
Sarahps33 wrote:
periods of time. I have one now and if it ran 12hrs outta 24 it would be an additional 192 amps.
Is that a 12VDC or 120VAC ? In either case, I would expect a fridge to run a most 8hrs per day.
Sarahps33 wrote:
I'm reading that AGM's have a depth of discharge rate of 80-50%. If we used 80% of each battery ...
You are reading that wrong ! For maximum life, you should only discharge them until there is 80% of the energy left in the battery.
Simply put, you can't get there from here ! Not without a lot more solar power or running a generator and chargers for several hours per day.
