Solar Panel Voc-MPPT?
Wondering if there is any relationship between measured Voc and MPPT performance with a 24v panel. My 12v panel has a Voc rating of 21.9 and Isc of 8.2, but I often see 8.2ish when Voc is only 20....
Forum Discussion
MEXICOWANDERER wrote:
...My God, all this stuff could be simplified by using a watthour meter (kWh meter) and DMM. When watts enter a battery it is a PRECISE measurement of energy. When "amp hours" enter a battery it is pure presumption of energy content. Presumption and assumption are blood brothers of an incestuous relationship when it comes to accurate data collection.
Both measurements are valid IMHO.
Current times seconds gives charge in coulombs which is what the battery really needs.
The change in battery voltage times the change in coulombs gives the change in the battery's energy in joules so energy can be calculated easily.
However, a watt-hour meter will give power in joules too if you multiply the watt-hours by the conversion factor of 3600s/1Hr.
So its kind of a wash as to which is better.
