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Old 12-08-2018, 04:54 PM   #1
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Battleborn Lithium ion batteries

I am about to invest in a couple Battleborn lithium ion 100AH batteries and an upgraded charge controller BUT I have heard that some lithium ion batteries donít have enough CCA to start the onboard Onan 4000 generator that I have. Iím not sure about the Battleborns brand though.

Does anyone have 2 of these and if so, does it have enough CCA to start your generator?

The Onan 4000 needs between 350-400 CCA to start it up. I do t want to invest that much money if I have to jump start my generator!!
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Old 12-08-2018, 05:35 PM   #2
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Ask a couple battery retailers this same question about cca's. I say a couple so you're not just asking the guy that wants to sell you the battery. Also have you tried the Retailer's website about specs on the specific batteries you're going to use? I know sometimes deep cycle batteries don't have cca's readily available as information
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Old 12-08-2018, 05:41 PM   #3
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A quick search on the battery below shows it has a 200-amp 30 second range. If you had two of them, I think you'd be okay for your generator, you might want to think about line drop depending how far your batteries are from your generator as well.Click image for larger version

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Old 12-24-2018, 10:10 PM   #4
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I called Battleborn and they said to get 3 batteries to play it safe with the generator. The Onan 4000W generator requires between 350-400 amps to turn the engine over. 2 batteries is border line.
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Old 12-24-2018, 11:02 PM   #5
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This came up in another thread. The three battery solution seems sure to work, but at about a grand a battery is expensive- and, if your motor home is like mine, three wonít fit in the under stair battery area.

I suggested an alternative solution- wire just the starter on the generator to the chassis battery. Believe the generator has a starter solenoid. Would have to remove any other connections from the proper (power) solenoid terminal and connect them to the house power, then run a LARGE diameter (low gauge) wire from that solenoid terminal to the chassis power. Ground is common and should not be an issue. The solenoid should isolate the chassis power line from the house power (which would trigger the solenoid).

I have not tried this - just an idea, not a tested solution.
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Old 12-28-2018, 01:23 PM   #6
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Quote:
Originally Posted by Rjpetr65 View Post
I called Battleborn and they said to get 3 batteries to play it safe with the generator. The Onan 4000W generator requires between 350-400 amps to turn the engine over. 2 batteries is border line.
That is surprising and ridiculous. My 3.6KW Onan generator has no trouble starting even when my "two" batteries are down to 30%, haven't tried it lower than that but it will be fine.
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Old 12-28-2018, 01:47 PM   #7
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That is surprising and ridiculous. My 3.6KW Onan generator has no trouble starting even when my "two" batteries are down to 30%, haven't tried it lower than that but it will be fine.
I'm also surprised. I've regularly started my Onan 5500 with a single lithium BB battery.
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Old 12-28-2018, 03:29 PM   #8
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Quote:
Originally Posted by Rjpetr65 View Post
I called Battleborn and they said to get 3 batteries to play it safe with the generator. The Onan 4000W generator requires between 350-400 amps to turn the engine over. 2 batteries is border line.
Quote:
Originally Posted by mlmay12 View Post
That is surprising and ridiculous. My 3.6KW Onan generator has no trouble starting even when my "two" batteries are down to 30%, haven't tried it lower than that but it will be fine.
I don't see how having a third battery for starting a generator is ridiculous. Unless you have a "pull start" option on the generator there's always the possibility that house batteries can be run down to the point they won't start the generator. Short of a jump start then what?

Not saying the generator needs to have a LiFePo battery for starting but a smaller battery sized just for the generator would be the ticket. Maybe even a battery capable of starting a large motorcycle like a Harley.

Running a heavy wire with bypass solenoid from chassis battery might be a good substitute as well. Use solenoid to connect chassis battery directly to generator's solenoid terminal for "jump starting".

Basic rule with batteries. If they can go dead they will and it will be at the least convenient time.
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Old 12-28-2018, 04:49 PM   #9
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Why not just add a small lead acid battery for generator starting? It could be wired via a solenoid so that it drops out when the generator isn't running so won't affect the charge controller, once started it would charge off the generator no? If not plug in a small Harbor Freight charger to the generator connected to that battery.
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Old 12-28-2018, 05:55 PM   #10
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I don't see how having a third battery for starting a generator is ridiculous. Unless you have a "pull start" option on the generator there's always the possibility that house batteries can be run down to the point they won't start the generator. Short of a jump start then what?

Not saying the generator needs to have a LiFePo battery for starting but a smaller battery sized just for the generator would be the ticket. Maybe even a battery capable of starting a large motorcycle like a Harley.

Running a heavy wire with bypass solenoid from chassis battery might be a good substitute as well. Use solenoid to connect chassis battery directly to generator's solenoid terminal for "jump starting".

Basic rule with batteries. If they can go dead they will and it will be at the least convenient time.
I would start it off the Chassis battery, in fact my Dynamax has an interconnect switch to momentarily connect the 3 batteries together. If it didn't have the switch I would rather pull the chassis battery to start the generator than haul around a 60 lb battery I would probably never need. Of course I am very Cargo Weight challenged so it might work fine for others.
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