I have a Chinese pickup with an AC controller & dead lead batteries.
Originally it was 72v, found out it has a maximum input of 117.9v, 118v will set an overcharge error code & turn it off.
I am changing it over to 30 cell Chevy Volt packs each using (2)12 cell blocks & (1) 6 cell block.
The closest lithium profile in my Delta-Q charger is 116.784v, 119.76 is too high.
For maximum mileage which would work best:
charge all 30 cells to 116.784: --------------------3.89v per cell
use only 29 of the cells charged to 116.784v: ---4.03v per cell
use only 28 of the cells charged to 116.784v: ---4.17v per cell
How hard is it to remove one cell versus adjusting the charger voltage? i would consider using 30 cells and adjust the charge, the extra capacity of a larger pack will give your more range--you can't use higher voltage but can always use more current.
I don't need a lot of power, the truck is light . It's easy to use only 29 cells, just have to connect the cable to a different terminal on the battery top. The charger doesn't have any other profiles from 116v to 119v to get closer to the ideal 117.9v for all 30 cells.
What I was thinking:
If I charge 30 cells to 116.784v & run them down to 105v (3.5v per cell) I
would have 11.784v usable volt range on the voltmeter to drive.
If I charge 29 cells to 116.784v & run them down to 101.5v (3.5v per cell) I would have 14.284v usable volt range on the voltmeter to drive.
More volts = longer drive time = longer range, does this look right?
14.284v is 21% more than 11.784v
But 30 cells is only 3.4% more than 29 cells
So yes you will have more available power charging 29 cells up to 116.78v than charging 30 cells up to the same value
No - even that is wrong - you don't lose the 3.4% - you just gain the 21% by being able to charge them more
that's what it looked like to me too, I'll leave one cell disconnected.
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