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 > Lithium battery as starter assist

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ramsaymike

Bobcaygeon ON

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Posted: 11/15/21 09:36am Link  |  Quote  |  Print  |  Notify Moderator

I am considering changing out the house batteries with a single 100 ah lithium. In certain conditions I need to use the battery combiner dash switch to start the engine. Would this still be possible with the lithium battery? Thanks.


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2oldman

So Cal

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Posted: 11/15/21 09:42am Link  |  Quote  |  Print  |  Notify Moderator

What are the existing house batteries? Starters can take hundreds of amps.

ramsaymike

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Posted: 11/15/21 09:47am Link  |  Quote  |  Print  |  Notify Moderator

Starter batteries (2) are conventional lead acid. I generally see max current is 2c so I think 200 amps 3-5 seconds for the li battery I am looking at. I don't know if the BMS would protect the protect the battery or I would risk damage.

Original house batteries are deep cycle lead acid.

2oldman

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Posted: 11/15/21 09:50am Link  |  Quote  |  Print  |  Notify Moderator

Then you'll need an Li battery that can deliver 2c. Not all can.

pianotuna

Regina, SK, Canada

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Posted: 11/15/21 12:02pm Link  |  Quote  |  Print  |  Notify Moderator

ramsaymike wrote:

I am considering changing out the house batteries with a single 100 ah lithium. In certain conditions I need to use the battery combiner dash switch to start the engine. Would this still be possible with the lithium battery? Thanks.


The short answer is NO, unless there is a massive Li battery bank.

Why? The battery management systems on Li batteries limit the output to about 100 amps (some are more some are less). The starter draws hundreds of amps.

You could do what you want with an SiO2 battery, which are able to do a 4C rate continuously, and 9 C for 5 seconds (400 amps from a 100 amp-hour battery)


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

time2roll

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Posted: 11/15/21 12:32pm Link  |  Quote  |  Print  |  Notify Moderator

Yes. However 100 Ah might be light for general use and for the boost start. Worst case it will not work and you will have to do something else to get started.


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2oldman

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Posted: 11/15/21 01:13pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Why? The battery management systems on Li batteries limit the output to about 100 amps (some are more some are less).
Battleborn will allow a 200a surge for 30 seconds.

pianotuna

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Posted: 11/15/21 01:32pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the info 2oldman

200 amps may not be enough to run a starter motor. On my Elantra--sure, on a diesel...iffy.

2oldman

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Posted: 11/15/21 01:43pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

200 amps may not be enough to run a starter motor.
No, but as a bit of help to chassis batteries, perhaps. If it were my rig I'd go with 2.

wa8yxm

Davison Michigan (East of Flint)

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Posted: 11/15/21 04:12pm Link  |  Quote  |  Print  |  Notify Moderator

Somethng many are forgetting is the voltage on LiFePO4 is slightly higher than Lead acid. to the Li's may charge the starting batteries

I have a little LI battery pack.. designed specifically for jump starting. the battery is TEN that's right 10, amp hours.

Never tried it on a motor home
but a 4lung car.. Varroom


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


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