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?
Only If/When using power at the same amp draw as the mfg specs the 20 HR rate
If 20he rate is 5 amps, and you are using 2 amps, then the total useable AmpHrs will be greater than spec
If you are using 10amps then the useable AmpHrs is less than spec
If you have a 100w load that is constant, as the voltage drops, amps flow/use increases to maintain that 100watts of work energy
DC resistive loads don't do that,
But inverters and DC to DC voltage converter will increase input amps use , watts, HP, btu , calories are all specific energy/power measurements that accurately describe real power use, and can be converted from one to the others
And yes calories is a measure of heat energy from a food source,
Yes it takes laboratory equipment to do to these measurements
