[nsdtr3]

Hi all,
Always lots of great ideas and information for those of us with challenges. We have a 2017 Montana 3720RL. We have 2 x 150W solar panels on the roof, an onan propane generator. A magnum charger/inverter, 4 Battleborn 100amp lithium batteries in parallel along with a victron BMS and MPPT solar charge controller.

See pics.

Here's our question. The RV is in a storage structure with a roof and open sides. After the batteries are charged to 14.2 they drop down in a few weeks to where they are unable to start the generator. I plug the RV into my truck and after a few minutes the batteries are charged to 11.6 and I can start the generator and charge the batteries again. I decided to purchase a portable solar panel with enough cable to place in a spot behind the RV the sun hits and use it as a trickle charge to keep the batteries charged.

I think the batteries shut off after the voltage drops below a certain range (in the 12.0)

Thoughts? I spoke to Battleborn and they suggested disconnecting the negative cable from battery to the RV after the batteries were charged above 14.2 I did do that yesterday but it is a pain to get the wrenches on the bolt and unscrew the nut. That's why I purchased the portable solar panel from Renogy.

Thanks for reading and making suggestions,
John