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Old 01-07-2022, 16:04   #1
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Batteries

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.
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Old 02-07-2022, 00:42   #2
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Re: Batteries

Hi can anyone help me with my battery setup, please.
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Old 02-07-2022, 01:18   #3
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Re: Batteries

The DC/DC battery charger is independent of the battery selector switch. Just wire it as per the manufacturer instructions.
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Old 02-07-2022, 01:30   #4
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Re: Batteries

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.
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Old 02-07-2022, 01:37   #5
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Re: Batteries

Is it just me or is it I bought a Li and Im not sure what to do next , fill me full of fear
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Old 02-07-2022, 16:09   #6
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Re: Batteries

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Originally Posted by Tocatta View Post
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.
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Old 02-07-2022, 16:23   #7
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Re: Batteries

Thank you so much that makes it a lot easier for me.
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Old 02-07-2022, 16:47   #8
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Re: Batteries

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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.
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Old 02-07-2022, 17:07   #9
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Re: Batteries

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Is it just me or is it I bought a Li and Im not sure what to do next , fill me full of fear
Since you asked - Its just you
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Old 02-07-2022, 17:20   #10
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Re: Batteries

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.
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Old 02-07-2022, 17:36   #11
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Re: Batteries

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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.
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Old 02-07-2022, 18:24   #12
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Re: Batteries

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.
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Old 02-07-2022, 21:59   #13
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Re: Batteries

Thanks again I'll be leaving it on the 1 the starter battery.
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Old 03-07-2022, 07:53   #14
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Re: Batteries

@goboatingnow #5: No, it's not just you.
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Old 03-07-2022, 10:15   #15
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Re: Batteries

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@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.
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