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Thanks. There is 4 feet of 6AWG from controller to the battery. But your tip led me to check voltages and the circuit breaker between it and positive bus seems to have drop across it so I took it out but still having the same issue. Waiting to see if Renogy support has an answer.

I have the 30A combo MPPT DCDC charger in my travel trailer. When connected to the car for DC-DC charging, it reads the trailer battery voltage as 14.4 and cycles on and off with the Renogy app reporting boost mode. Same thing with solar panels connected or not. With only solar input, it reads...

Got it! Thanks for the explanation, which lead to some more reading. The engine end of the DC-DC wire is grounded on the same chassis bolt as the lead from the vehicle battery. At the trailer, the two grounds are on the negative bus. So I hope that avoids the "potential" problem.

I am not sure I understand what you mean by "parallel with a tow cable". If you mean the 12V accessory line in the connector, I disconnected it from the bus and it terminates into the IGN wire to the Renogy unit. So it is not charging in parallel. All the negatives are connected to the same bus...

I think you nailed it. There was zero voltage at the outlet contact 4 (12V accessory/charging) until the ignition was turned on, when it went to 14.1V. After turning ignition off, it remained around 11.9 - 12 V. I watched for over 10 minutes, then had to do something else. I will check again to...

Maybe too late for the OP, but I have installed the 30A unit for my Ascent/Airstream Caravel 16RB. The dual charger outputs the full current (30 or 50A) if a single source (alternator or solar) is active. It limits to 50% from either source only when both are connected; p16 of the manual. I have...

Yeap, that is what I did. I connected the 12V charging wire from the 7-way connector (originally on the positive bus) to the ignition wire supplied with the Renogy unit. The red LED (#10 in the manual's diagram) did not go off when the car ignition was turned off.

I installed a Renogy 30A DC-DC/MPPT combo and it works well. The one glitch is that it seems to draw around 2A when the ignition is off. The charging vehicle is a 2021 Subaru Ascent and I have the ignition wire connected to the Renogy using the 12V line in the 7-way connector. Of course, if I...

I am using the Renogy DCC30S (combined DCDC with MPPT) in Airstream 16. This unit was well reviewed by Prowse, saves space that is at premium in small trailer. I want both charging modes as I am in Canada, sunlight is limited in winter, and we tend to drive sufficient distances so the DCDC will...

Did you do this? I have the same question. Thanks.