Originally Posted by jls
was thinking i should carry some jumper cables and found out about the jumper packs which can double as powerbanks to charge devices, etc. those also don't require another vehicle to get mine started. then i started to wonder if there isn't some way to just use my lithium coach batteries to accomplish the jump start if needed. would that be possible? and which of these three approaches to jump-starting is the best?
Typically the Battery Management System on an RV's lithium battery cannot supply the high amperage needed to start a diesel engine. You will want to check the manual on your batteries to determine the maximum amperage. For instance the Battle Born batteries can supply 100 amps for 30 seconds, even with three in parallel you only have 300 amps and a Sprinter diesel probably requires 600 or more amps to start. Jump packs do not have the short circuit protection built in so they will deliver everything they can. Just note that most of the jump packs from China do not live up to their amperage ratings. https://youtu.be/JN8A2nIMUWA