Charging lithium from outboard motor

[CPT Davenport]

I will be swapping out my 100ah lithium in the camper for a 200ah lithium. I would like to put the 100ah in one of my boats to run things like my trolling motor, downriggers and a crab pot puller (not all at once of course). In this boat I have a SLA starting battery. What would be the proper way to wire the new lithium so that it will be charged from the outboard while underway?

 

[PaulT]

I would use one of the DC-DC chargers such as those from Victron. Keep in mind that your outboard charging system likely has lower charging amps available than your truck. My Yamaha 90 has only a 25 amp alternator and it must keep the starting and house batteries happy until I can plug in the onboard shore power charger.

Paul

 

[CPT Davenport]

I would use one of the DC-DC chargers such as those from Victron. Keep in mind that your outboard charging system likely has lower charging amps available than your truck. My Yamaha 90 has only a 25 amp alternator and it must keep the starting and house batteries happy until I can plug in the onboard shore power charger.

Paul

Good point Paul. My Tohatsu 60 only puts out 21 amps. Perhaps it is not worth it and I should just rely on my lithium charging from shore power. I may just instal a shunt and run some of the proposed equipment to see what I'm up against.

 

[PaulT]

I use this small DC-DC charger from Powerwerx to charge my ham radio LiFePO4 batteries, (from 9 Ah to 30 Ah) from my truck. It has a switch to choose 2, 4, or 8 amp charging and could bridge the gap between nothing and finding shore power.
Powerwerx DCDC-8A 14.5V, 8A Adjustable DC-to-DC Battery Charger for 12V LiFePO4 Batteries

Might be worth a look.

Paul

 

[CPT Davenport]

I use this small DC-DC charger from Powerwerx to charge my ham radio LiFePO4 batteries, (from 9 Ah to 30 Ah) from my truck. It has a switch to choose 2, 4, or 8 amp charging and could bridge the gap between nothing and finding shore power.
Powerwerx DCDC-8A 14.5V, 8A Adjustable DC-to-DC Battery Charger for 12V LiFePO4 Batteries
Might be worth a look.

Paul

Thanks Paul