I have a power bank consisting of two LiFePO4 cells connected in parallel. They will used to power a range of 12 V electronics e.g. fans, fish finder, USB chargers, L.E.D lights and potentially a coolbox. These will be drawing power both when the engine is running and when it is switched off. I want to charge them using:
The alternator on the outboard motor on my boat. It is a manual-start motor. This means it has no starter battery. It is rated to produce 20 A.
The alternator in my car. The alternator charge current is 70 A.
Both alternators should output 14.5 V max. From what I understand this DC - DC charger would work for the car but not for the boat, as it requires a starter lead-acid battery. Is this correct?
Is there anything that will allow me to charge the battery from both my boat and car using the same charger?