BFL13 wrote:
So the "peak watts" reading on the meter doesn't relate to how the controller can do twice as many watts at 24 than at 12 because the amps rating stays the same?
Was it the panels going above spec or just the watts being at 24 that did it? Is there a meter setting that didn't get swapped over with the change?
I know you can't get more just by changing from 12 to 24. I am wondering if it was a meter thing somehow. I know I am more than a little confused (again)
In fact I do get more watts out of my 690W of panels because of the switch to 24V. That's because the Rogue 30A mppt controller has a max limit of ~480W for a 12V system and twice that for a 24V system. So the gain only occurs when the solar Watts exceed the 480W. Under 480W, there's no difference.
And from what I'm reading here, panels can exceed their nominal rating, and my observed 10% over the rating may be real.
Rogue Manual wrote:
The maximum usable PV array power when taking into consideration system losses may be approximately calculated using the following formula, where Vb is the battery voltage: PV(watts) = (30 x Vb) / 0.90 (this assumes overall system efficiency of 90%).
Rogue uses 14.4V and 28.8V to get max 480W and 960W respectively.
