Forum Discussion

ktmrfs's avatar
ktmrfs
Explorer II
Oct 17, 2013

Answering some solar panel with MPPT controller ?

Here is some real world data on solar panels when used with a MPPT controller to answer some question I, BFL and others have. This report is focused on the questions we had regarding solar panel use...
Salvo's avatar
Salvo
Explorer
Oct 18, 2013
You may have a measurement error. Where are you measuring Vmp? It should be directly at the panel, not at the controller.

In any event, the controller is starved for volts. This system should show better results if battery voltage is dropped to 12.5V.

ktmrfs wrote:
Post #5


Parallel connection with 90ft of cable
Vmpptin=14.60V (TX3DMM)
Impptin=8.3A (DM330)
MPPT power in=14.60*8.3=121W
Vbat= 13.50V (TX3DMM)
Ibat=9.0A
Power to battery= 121.5W

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,278 PostsLatest Activity: Jul 03, 2025