We would like to connect the Multiplus II to the vehicle electrical system to be able to charge the “starter battery” together with additional “battery bank” when the grid AC is connected. The Multiplus II will be the inverter mode from the 12VDC alternator to the AC load while grid AC is disconnec…

If you are just using the trickle charger from the inverter to the start battery… [image] How does the Multiplus trickle charger work DIY The trickle charger on the Mutliplus is not a true charger, it does not have a set charge voltage. It is a small circuit t…

[image] K.T.: “starter battery” together with additional “battery bank” Youve already seperated the systems, the starter battery is connected to the vehicle and being charged by the alternator. The additional battery bank is connected to the Multiplus and being charged by the Multiplus. What…

So mainly I can use the trickle charger feature of the Multiplus together with the DC/DC converter. Can I use the lower cost battery isolator instead of the Orion?

I’ve used one of these on my 24V Lithium leisure battery to trickle charge the starter battery before: https://a.aliexpress.com/_EjzHtSA It’s only a small charger.

Yes, you can use a basic solenoid style isolator as long as both batteries are lead acid. If your house batteries are LFP then, technically, no. A DC-DC charger is the only reliable way to charge the LFP house batteries from the vehicle alternator. You may be able to get away with a basic isolato…

Thank your for all suggestions. I will try the Cyrix-Ct 120A first, because the secondary circuit would take about 100A from the alternator.

Connect the Multiplus II to the vehicle electrical system

DIY

lxonline (LX) 18 July 2026 08:09 2

If you are just using the trickle charger from the inverter to the start battery…

the manual is not refering to that as being the not suitable part.

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Connect the Multiplus II to the vehicle electrical system

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