question

There are a lot of possibilities. Your panels could be an issue. You could have a wiring issue between them and your MPPT or between your MPPT and your battery. You might have a configuration issue in the MPPT.

It’s going to be hard to debug a whole setup over this Q&A forum, but you can start by getting your multimeter and measuring some DC voltages. Measure the voltage at the MPPT solar input when the battery is not full (should be charging) and the sun is out. Measure the output terminals of the MPPT. Measure the voltage at the battery. Turn on Victron Connect and see what voltage it thinks it is seeing.

Try to get all of those simultaneously or at least in stable weather so there is no fluctuation due to clouds.

Let us know what you find.

Hi @ASRick

I think you should start by looking at your system in detail yourself.
How is the MPPT wired to the PV and to the battery. Check for any broken fuses.
How is the MPPT configured? Is it set to the correct battery voltage.

When not sure about the operation of the MPPT.
I would advise you to contact a Victron dealer to help you with this.
if you do not know who your dealer is, please visit: https://professional.victronenergy.com/support/

best regards
Martijn Coster - Victron Energy

Thanks for the replies. I took some numbers.

Batts at mppt. 12.2v and charging

Solar input 13.3 to 13.6 fluctuating. Because of the mppt?

Load terminals at mppt 12.2v

Victron connect says 16 watts

PV is 13.16v. 1.2amps

Batts are 12.11v 1.3amps

Full sun but panels do not all get full sun at the same time because they are on a RV that has a rounded profile. 100watts each side. The panel voltage is over 19watts. I have 2 Duracell 105AH agm Batts, 2 months old now. I have to use the Gen to top them off with the RV charger everyday. I'm on the road with bad cell service most of the time. I should have service for several days now.

Thanks,. Rick

.

Whoops, the solar panels produce 19 volts or better. The battery leads are connected to+ and - as are the pv. It's got me puzzeled. Perhaps my controller is defective? I've had some poor solar days, but I've also had some very good days. Charging results are not good on the good days. My Gen is running as I type ,today was not a good solar day here. It clouded up by 12:30. I have sun now but know from experience not enough to get me charged. Any suggestions are welcome. Thanks

Rick