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Old 07-31-2021, 06:07 PM   #1
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Adding lithium house battery, lose any features?

From what I read to add a lithium battery, you need to protect your alternator from burning up...

So, you add a dc to dc charger...

So alternator charges chassis battery, then dc to dc charger charges lithium battery at a rate limited amperage of 20-30 amps...

Great, no issues, will use solar to charge...

But what about using the house battery to jump start your rv if needed? Do you lose that function??? If you put a 30 amp limiter in the circuit does that now limit this ability...?
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Old 07-31-2021, 06:36 PM   #2
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Adding lithium house battery, lose any features?

I use a magnum smart battery combiner that limits the draw to 30 amps.

I can still (jump) my chassis with lithium but have never had to because the combiner keeps them charged.

If you needed to I left my big relay that will join the set together —- but you do it differently do not crank the engine with the banks tied use the relay to quickly charge the chassis 15-30 min then disconnect and crank the chassis.
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Old 07-31-2021, 06:48 PM   #3
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Quote:
Originally Posted by Biljol View Post
I use a magnum smart battery combiner that limits the draw to 30 amps.

I can still (jump) my chassis with lithium but have never had to because the combiner keeps them charged.

If you needed to I left my big relay that will join the set together —- but you do it differently do not crank the engine with the banks tied use the relay to quickly charge the chassis 15-30 min then disconnect and crank the chassis.
Ok, that seems to make some sense... does limit cranking I would suspect as very little current gets to the dead battery...

I guess one could manually jump the battery with jumper cables...
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Old 07-31-2021, 06:54 PM   #4
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Adding lithium house battery, lose any features?

Might be a bit of confusion —- l left the solenoid that connects the two banks at high amps so I press the boost and high amps go to the chassis battery’s to charge them. Does not take long to charge them to crank at that high amperage. Think of it as a super fast battery charger.

You just don’t want the load of cranking the starter on the lithium banks.

This is one reason there are not lithium starter batteries as of now it is not a good use of their chemistry.
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Old 08-01-2021, 09:35 AM   #5
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Pay careful attention to what Biljol said. In any setup with LiPo house batteries and Lead Acid chassis batteries, use the merge solenoid to charge the low chassis batteries for a few minutes. IF you attempt to crank the coach with the batteries merged the LiPo batteries have such a huge ability to deliver current at 2 to 3 times the battery bank capacity that you will likely blow the great big fuse on the house batteries. This is not hearsay or theory, I know of one owner who toasted a 400 amp fuse in just this manner.
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Old 08-01-2021, 10:23 AM   #6
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Thanks guys, very informative
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