Question about the output from my DIY Solar
So I could use a "shove in the right direction." My Solar is all DIY. Two 100 watt panels, an EPEver 30A MPPT controller. One group 27 (for now). It's working. It's keeping the battery charged. ...
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Panel rated wattage is 200w. Lose 10% from panel heated by sun. Now at 180w. Lose say 2% line loss array to controller. Now at 176ish watts at controller input. Lose 4% controller inefficiency, now at 169w controller output.
Amps to battery is output watts/ battery voltage (with no line loss to battery assumed)
169/12 = 14 amps
169/13 = 13 amps
169/14 = 12 amps
BUT if the battery is nearly full it won't accept so many amps. So the MPPT controller just supplies the "demand" (buck converter in it)
If battery will only accept 2 amps at 13.6v, that's 27 watts.
If you now turn on a light for 3 more amps, the controller will now supply 5 amps and watts will be 5 x 13.6 = 68w.
Amps to battery is output watts/ battery voltage (with no line loss to battery assumed)
169/12 = 14 amps
169/13 = 13 amps
169/14 = 12 amps
BUT if the battery is nearly full it won't accept so many amps. So the MPPT controller just supplies the "demand" (buck converter in it)
If battery will only accept 2 amps at 13.6v, that's 27 watts.
If you now turn on a light for 3 more amps, the controller will now supply 5 amps and watts will be 5 x 13.6 = 68w.
