Are all amp hrs equal?
Say you have 230 amp hrs in 2 6vGC batteries and you discharge at a low amp rate say 1 amp so if you discharge to 50 percent SOC you should have used 115 amps in 115 hrs. If you then discharge at a h...
Forum Discussion
Gjac wrote:jharrell wrote:. If the reduced AHs due to the higher discharge rates is not caused by heat what then actualy causes this reduction?Gjac wrote:
I assumed this loss in amp hr capacity was due to heat. If this is true, can one also assume that these higher discharge rates producing more heat also reduce battery life every thing else being equal (still only discharging to 50 percent)?
No in fact Peukert's law does not take into account temperature change from self heating. Temperature does effect capacity but that it is somewhat independent of discharge rate. That is if you keep the batteries cooled to a constant temperature during discharge, capacity will still be reduced according to Peukert's law.
chemical reaction efficiency is reduced and increased plate sulfation, which in turn decreases exposed plate surface area and weakens the electrolyte at the same time, reducing over all capacity
think of it like fuel mileage,
the faster you go the less miles per gallon, and the less miles per tank of fuel, there is a sweet spot that gives you maximum fuel mileage, but you won't drive all day 30 mph
and you won't use your batteries at 3 amps either
although each of those examples will give you more mpg and more ampHrs from your battery bank
