Forum Discussion
BFL13
Mar 30, 2014Explorer II
The problem with the AH counter on the solar controller is if you depend on that to tell you when you have restored the AHs taken from the full battery.
If it happens during the recharge of the battery that the solar has some spare amps to run other things and it does, then that will add to the AH count and give a false idea how full you are getting. So you would think the battery is at higher SOC than it is.
The Trimetric AH counter does not have that issue, since it does not show any solar work other than to the battery. I suppose the Kid would not either if its program does that.
Any attempt to have a "% of full" or "battery SOC" gauge on just what the solar is doing will be in error. The Trimetric and Kid would be in error too but in a different way
-from a wrong idea of what the full capacity is
-from a wrong value for heat loss on recharge
The Trimetric AH counter needs a reset quite often for these reasons. In the afternoon on solar it can go past the old "zero" and go positive so you end up looking like you put more in than you took out. So when it peaks that day, you set a new zero. I suppose the Kid would do the same. It depends on what value for heat loss the Kid uses if any. Trimetric uses 4 percent ISTR.
If it happens during the recharge of the battery that the solar has some spare amps to run other things and it does, then that will add to the AH count and give a false idea how full you are getting. So you would think the battery is at higher SOC than it is.
The Trimetric AH counter does not have that issue, since it does not show any solar work other than to the battery. I suppose the Kid would not either if its program does that.
Any attempt to have a "% of full" or "battery SOC" gauge on just what the solar is doing will be in error. The Trimetric and Kid would be in error too but in a different way
-from a wrong idea of what the full capacity is
-from a wrong value for heat loss on recharge
The Trimetric AH counter needs a reset quite often for these reasons. In the afternoon on solar it can go past the old "zero" and go positive so you end up looking like you put more in than you took out. So when it peaks that day, you set a new zero. I suppose the Kid would do the same. It depends on what value for heat loss the Kid uses if any. Trimetric uses 4 percent ISTR.
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