Cheap China Solar Controller Failure
For a couple days been noticing higher than the 14.6 voltage,.....going to 15, and even 15.5,....I knew something was not right. The next day it was showing 16, then quickly went to 17+.......I quickl...
Forum Discussion
Mr. Wizard, I appreciate what you're saying, but I still fail to see any real advantage to thinking in terms of WattHrs?
"2.8 amps @120v is 28amps at 12v, but at 12v its recharge time
so really you are likely using 24a at 12.x volts"
... which could essentially help compensate for some of the heat losses during charging, and thus help average out overall (i.e; actual) Ah usage/replacement.
I generally run between 12.5 and 12.8 volts, so the variance in amps used in any particular situation would be rather insignificant, I would think. So, I used an average of 2.79a, as opposed to 2.81a, for 10 minutes. No big deal. It's all about averages. Likewise, if half the time the fridge is using say 42w, and the other half its using 38w, it all averages out to 40w x 24hrs for 960wh's per day.
So, how does one then figure out how to replace 960wh's ?
"2.8 amps @120v is 28amps at 12v, but at 12v its recharge time
so really you are likely using 24a at 12.x volts"
... which could essentially help compensate for some of the heat losses during charging, and thus help average out overall (i.e; actual) Ah usage/replacement.
I generally run between 12.5 and 12.8 volts, so the variance in amps used in any particular situation would be rather insignificant, I would think. So, I used an average of 2.79a, as opposed to 2.81a, for 10 minutes. No big deal. It's all about averages. Likewise, if half the time the fridge is using say 42w, and the other half its using 38w, it all averages out to 40w x 24hrs for 960wh's per day.
So, how does one then figure out how to replace 960wh's ?
