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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > Lithium batteries high for Stepwell, will they start genny?

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DAS26miles

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Posted: 06/09/19 07:46am Link  |  Quote  |  Print  |  Notify Moderator

I'm thinking of replacing my original group 27 batteries that are in the step well compartment. The height clearance is 10" deep and the originals are 8 1/2 " high. The Lithium batteries that I'm considering are 9" and 9 1/2" high. That doesn't leave much clearnace for the cables on top. Being so close to the top has me wondering if hitting a bump in the road could cause the batteries to hit the metal step lid and shorting. Also, I read that Lithium batteries are not designed to start motors of any kind. What about the generator? My 4K Onan seams to peak just under 180 amp at start up. The Lithium specs say the 100 amp batteries can go to 200 amps for a few seconds, Any feed back?

Sam Spade

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Posted: 06/09/19 08:20am Link  |  Quote  |  Print  |  Notify Moderator

I think you will be MUCH better off getting AGM batteries.

They will be a bit more expensive than conventional but nothing like Lithium.

The existing charging equipment will work good with AGMs too.


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77rollalong

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Posted: 06/09/19 08:47am Link  |  Quote  |  Print  |  Notify Moderator

our genset starts off the coach battery, not the house battery. You may able to modify the battery box to drop it down lower to clear the top

D.E.Bishop

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Posted: 06/09/19 09:20am Link  |  Quote  |  Print  |  Notify Moderator

I would install battery hold downs in either case. The batteries should not be free to move about.


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time2roll

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Posted: 06/09/19 10:04am Link  |  Quote  |  Print  |  Notify Moderator

Yes they will start the generator. Get terminal covers if the clearance is tight. And yes all batteries should be held down.

Terminal covers


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2oldman

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Posted: 06/09/19 10:30am Link  |  Quote  |  Print  |  Notify Moderator

Can you lay the batteries on their sides? Li batteries should start anything.. huge current capacities.

DAS26miles

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Posted: 06/09/19 04:16pm Link  |  Quote  |  Print  |  Notify Moderator

My existing tie down strap should work. But has any one out there actually installed Lithium in their step compartment? What's the advatage of AGM's besides price? They don't discharge at a constant voltage or charge as fast as Lithium.

Seattle Steve

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Posted: 06/09/19 04:37pm Link  |  Quote  |  Print  |  Notify Moderator

DAS26miles wrote:

My existing tie down strap should work. But has any one out there actually installed Lithium in their step compartment? What's the advatage of AGM's besides price? They don't discharge at a constant voltage or charge as fast as Lithium.


Here's a video giving estimated cost comparisons between the 3 types of batteries.

RV Battery Comparison

DAS26miles

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Posted: 06/09/19 05:15pm Link  |  Quote  |  Print  |  Notify Moderator

Seattle Steve wrote:

DAS26miles wrote:

My existing tie down strap should work. But has any one out there actually installed Lithium in their step compartment? What's the advatage of AGM's besides price? They don't discharge at a constant voltage or charge as fast as Lithium.


Here's a video giving estimated cost comparisons between the 3 types of batteries.

RV Battery Comparison


Thanks, I'm more sold on the Lithium. It's a PITA to check the water level in the step compaartment with all the cables running on top of the batteries.

Chris Bryant

Arden, North Carolina

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Posted: 06/10/19 05:37am Link  |  Quote  |  Print  |  Notify Moderator

Are you getting batteries with the Battery Management System built in? Lithium are tops, but you don’t really just drop them in usually. I really would look at AGM.


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