Watt Hrs vs Amp Hrs
This article helps explain these ratings and raises a question wrt battery charging older vs newer LFPs too. Not sure if this also applies to other battery types or if it matters with any when you me...
Forum Discussion
BFL13 wrote:
One of the comments mentions that Watt Hrs are good when the voltage stays the same as in the stick house.
With a battery falling in voltage as you draw from it, does that not make using AH better for seeing how much capacity is left in it?
Actually, AC voltage doesn't stay the same. It will sag when big draws come online...if on shore power, this can be in nearby RVs also.
Watt-Hr is better as Watts = Amps * Volts and both Amps & Volts can vary. If you aren't stressing your batteries too badly, Amps by itself is a fair but less acurate estimate of Watts.
