MultiPlus II Trickle Charger Feature

[rfg9585 (Randy)]

I have read about the trickle charger feature for the starter battery on the multiplusII. All I read talks about when you have non-lithium as the starter battery. I have 100% lithium, for both starter and house batteries. Can I use this feature in my situation to keep the starter battery charged?

[thomasinaz (Derrick Thomas)]

Yes will work just fine.

[rfg9585 (Randy)]

Do I just run a wire from the trickle charge connector to the starter battery positive terminal, and done? Assuming that all grounds are correct…

I also read this in another post. Gives me concern about this working properly…

@pwfarnell

IF your system has the capability to provide the energy for a permanent 13.2V storage charge on the starter battery AND has positive disconnection of the DC supply to the Multiplus (Lynx BMS or batteries with built in BMS disconnection), then the trickle charger may be used with a lithium domestic battery and lead acid starter battery.

The trickle charger must not be used if the starter battery is lithium because it has no control over the charging voltage or current.

[pwfarnell]

Just connect the trickle charger output on the Multiplus to the positive of the starter battery BUT you must fit a fuse on this cable next to the starter battery to protect against a short circuit.

It will work from lithium to lithium OK but you have to be aware of the limitations of an uncontrolled charging source on your starter battery and an uncontrolled load on your house battery and make sure your batteries are protected.