Ok top- posting like mad here same as PT, :)
True. But Trimetric doesn't care since it is not Peukert aligned. (Bogart says it is close enough within normal RV amp draw range.---which I agree with having done it a lot.)
Also 6 instead of 4 with an AH usage suitable for 4 does make you operate in the higher SOC band (not 50-90s but higher), which can be bad for fast recharging, but if you are using solar with its low amps, that is not a concern since you don't taper until at way high SOC at low amps.
Got it on the res fridge issue! Yes off- grid with a 120v fridge is a PITA. Have that with the Truck Camper. Wish we had a propane fridge in it! (Not to be, sadly, so it is all work around for that.)
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"So are you saying that an ordinary hydrometer, which costs less than ten dollars US, can give an accurate state of charge? The thing looks so amateurish -- the plastic arrow wobbles around and eventually points to a color zone -- green for good, yellow for fair, red for bad. That can't be what you have in mind, is it?? "
No use a glass tube hydrometer with a bobber in it marked with SGs in green, white, red zones. Do not use the plastic sideways arrow thingy.
The glass tube $5.00 one is "good enough" and by using the same one every time you can tell when things get different.
That is the key to all this stuff--not the absolute accuracy of the one- time shot measurement, but watch for when it gets off the usual track using the same measuring instrument.
pianotuna wrote:
Hi BFL13,
Actually Peukert is always "there" so going from 4 to 6 jars makes the real amp-hours used from the battery lower.
BFL13 wrote:
If your daily AH usage has not changed then it doesn't make any diff if you now have 6 instead of 4 batts for how much solar you need.
Having 6 does:
A. let you go longer without solar input, and
B. let you run the high amp draws with less voltage drop, which means staying above the inverter low voltage alarm setting better
