solar

wintersun wrote:
An electric only fridge is a poor choice for dry camping. It will take 300AH of battery capacity and 300W of solar panel production at a minimum. With lead acid batteries the 300AH will provide only 150AH for the fridge and everything else in the RV as going below 50% SOC will greatly decrease their useful life and increase the time it takes to recharge them.

For an electric only fridge the best solution is to invest in lithium phosphate batteries that can take a 80% discharge without damage and that can be recharged at 4 times the rate of lead acid batteries so the generator run time will be greatly reduced and solar charging will be more effective during the limited hours of daylight.

I don't think you have done the calculations for that.

You keep seeing this claim about faster charging with LFP, but nobody explains how to do that. EG this "4 times the rate" claim that will reduce gen time.

To me that must mean restoring four times the AH in the same time that it would take with FLAs . Or same AH in 1/4 the time.

If you now have four 6s at 460AH and a 75 amp charger powered by a 2200w gen (like my set-up), that means you can do a "50-90" (184AH) in about 3 hours.

To do that in 1/4 the time- 45 minutes-that means charging at 245 amps. (184 x 60/45) So first you need a 245 amp charger or combination of chargers, and a generator to run that.

I doubt that is what was meant! So how about some realistic numbers with a realistic RV set-up for chargers and gen sizes and the LFP bank vs the four 6s, a 75 amper, and a 2200w gen?

EDIT--ok, say I had the same set-up only with LFP so no amps tapering. It all gets done at 75 amps. 184/75 is 2 hrs , 27 min. so I would save 33 minutes (from 3 hours) of gen time. Not quite the same as "four times faster" is it?

How about I do a 50-80 with my four 6s? Now it all gets done at 75 amps where amps start to taper at 80% SOC. 150AH in two hours. Swap to LFP and--oops--still 150AH in two hours.