It seems that many people face the issue with the Mercedes Sprinter battery dying within only a few weeks or even days. I personally fell victim to this and have already needed to replace the battery on my almost new van!! So... I found a solution which charges the car battery from your house battery bank + solar panels. It's called the Amp-L-Start

Products in this video
- amp-l-start: http://www.lslproducts.net/ALS_Overvi...
- 20 amp self-resetting breakers: https://amzn.to/38tP0IA
- 10awg tinned copper wire: https://amzn.to/3NEI3mP
- 10awg terminal connectors: https://amzn.to/3wSyICk