Batteries

[Tocatta]

Hi there I'm living on a mottel 33 and I bought 2 lithium batteries and a DCDC CHARGER, I was just wondering if someone could help me, I have a battery selector switch how do I wire up my dcdc charger for lithium batteries or do I just leave it how it is and wier up the dcdc charger like they say which is 2 wire's to the starter battery and 2 wire's to the lithium batteries and 2 wire's to the solar panel's.

[Tocatta]

Hi can anyone help me with my battery setup, please.

[Ballsnall]

The DC/DC battery charger is independent of the battery selector switch. Just wire it as per the manufacturer instructions.

[Tocatta]

Thanks so much for your help, one more thing when I start my motor I start I start it on number one do I leave it on that or can I move it to the both and then move it to two on my battery selector switch, thanks so much again.

[goboatingnow]

Is it just me or is it “ I bought a Li” and I’m not sure what to do next “ , fill me full of fear

[Ballsnall]

Originally Posted by Tocatta

Thanks so much for your help, one more thing when I start my motor I start I start it on number one do I leave it on that or can I move it to the both and then move it to two on my battery selector switch, thanks so much again.

It's not a good idea to switch banks when the motor is running (unless you have a special battery switch with alternator field disconnect feature) Also this is why you have a DC/DC charger so you don't have to manually switch banks, your alternator will be charging both banks.

[Tocatta]

Thank you so much that makes it a lot easier for me.

[StuM]

Originally Posted by Ballsnall

It's not a good idea to switch banks when the motor is running (unless you have a special battery switch with alternator field disconnect feature) Also this is why you have a DC/DC charger so you don't have to manually switch banks, your alternator will be charging both banks.

It's generally OK to go 1->Both->2 when the engine is running but don't go 1->Off->2. That's when the sudden loss of load can blow the Alternator diode.


Switching to your house bank once the engine is running is a good idea to avoid draining your start battery if loads exceed your alternator output and it's essential once you have shut down your engine.

[S/V Illusion]

Originally Posted by goboatingnow

Is it just me or is it “ I bought a Li” and I’m not sure what to do next “ , fill me full of fear

Since you asked - It’s just you

[Tocatta]

Hi again so it's OK to go from 1 to both to 2 the house batteries even with lithium batteries, I thought I had to stay on the starter battery cause of the lithium batteries.

[StuM]

Originally Posted by Tocatta

Hi again so it's OK to go from 1 to both to 2 the house batteries even with lithium batteries, I thought I had to stay on the starter battery cause of the lithium batteries.

A momentary switch through both will be OK, just don't leave it on both with different type of batteries.

[Ballsnall]

Leave it on your start battery. The DC/DC charger will charge the house bank. You only use position 2 or both if you have a flat start battery.

[Tocatta]

Thanks again I'll be leaving it on the 1 the starter battery.

[CharlieJ]

@goboatingnow #5: No, it's not just you.

[goboatingnow]

Originally Posted by CharlieJ

@goboatingnow #5: No, it's not just you.

To me Li is not a newbie task. It requires a good understanding of the first principles , risks and safety issues. Hence why I get nervous ( like u ) when I see the OPs comment.