Hello, everyone:
I have 100W X2 Renogy panels(RNG-100D, used), I use them to charge my 12V LiFePo4 (100A) for Aux pump (12V). I use MakeSkyBlue MPPT V118 for test them. (Battery type, Li, charge Voltage 14.40)
With single panel, shows Voltage 20.31, Watts 46.16, it is ok. (here in New York, and Winter) I tested 2nd panel, about the same. So I go ahead set them up in Series, then I noticed the Voltage from Pv is 40.98, and Watts is 45.78. The Voltage is double as connect in Series, but output like single panel(100W). Then I change the connection to Paralell, they are 20.12V and 45.91W. I disconnect and connect each panel individually to test again, seems ok, each panel output about 44W. But when I put them back to Series, Voltage rise and Watts output same as single panel.
First I thought maybe my battery almost full charged. So, I discharge LiFePo4 down to 12.9V, and test again. Samethings happened, 2 panels connected together, but output just like single panel. I am really not sure what I did wrong. Both PV and Battery wires are #10AWG.
Anyone, any ideas?
I have 100W X2 Renogy panels(RNG-100D, used), I use them to charge my 12V LiFePo4 (100A) for Aux pump (12V). I use MakeSkyBlue MPPT V118 for test them. (Battery type, Li, charge Voltage 14.40)
With single panel, shows Voltage 20.31, Watts 46.16, it is ok. (here in New York, and Winter) I tested 2nd panel, about the same. So I go ahead set them up in Series, then I noticed the Voltage from Pv is 40.98, and Watts is 45.78. The Voltage is double as connect in Series, but output like single panel(100W). Then I change the connection to Paralell, they are 20.12V and 45.91W. I disconnect and connect each panel individually to test again, seems ok, each panel output about 44W. But when I put them back to Series, Voltage rise and Watts output same as single panel.
First I thought maybe my battery almost full charged. So, I discharge LiFePo4 down to 12.9V, and test again. Samethings happened, 2 panels connected together, but output just like single panel. I am really not sure what I did wrong. Both PV and Battery wires are #10AWG.
Anyone, any ideas?