MrWizard wrote:
I am not happy with the idea the converter requires more VA as the battery voltage rises, for instance. I can test for that over a longer recharge time from a lower SOC
Confuse yourself ?
Efficiency changes as the charge SOC progresses, but the converter does not need more VA to deliver 40 amps charge than it does to deliver 75 amps charge
How ever, When I get down to 4 amps charging, pf is like 0.546
But when it's charging above 70 amps PF is like 0.768 I remember seeing 0.796 at one point
Watts in versus battery charging amps always changes as the battery fills up
That's true of all switching supplies, and our converter is a switching supply
I have seen how the VA required drops right off when amps taper at the start of the Absorption Stage. Battery voltage also continues to rise after that towards the voltage set on the converter.
My problem is that I have not seen VA rising (not enough measuring perhaps) during the Bulk stage. Constant 75 amps while SOC rises from 50 to say 73%. Battery voltage rises all during that time.
So I would be looking at VA vs battery voltage in the Bulk stage. I did see on the Kill-A-Watt how the VA components change. Lower 120v voltage and higher 120v amps to it over time. I want to see what that was all about too vs rising battery voltage over a longer time.
If it is true that VA is lower with lower battery voltage and same 75 amps in the Bulk stage, then I should be able to find a max battery voltage that will still give me the 75 amps at just under 1700VA and not have that red light start flashing.
I can stop the battery voltage getting any higher than that by setting the charger's voltage to just over that.
Then to find if that max battery voltage is at a high enough SOC to call it a 50-80 or whatever.
If the VA stays the same 1700 during the Bulk stage with the red light flashing the whole way from 50%, then that won't work.
