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 > Need a battery to start my Onan, 460 cca min, dual-purpose?

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time2roll

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Posted: 11/14/22 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

SCADAMAN29325 wrote:

time2roll wrote:

Please check that the generator charges both the house and chassis battery while running.


Is this as simple as checking the voltage on the house battery terminals, with engine started?

Sorry to be so ignorant about this, but just want to make sure I understand.

Thanks.
YES!

12.8 or less is probably not charging. 13.2+ is charging.

Check separately with the engine running and then with just the generator running. Post the results if there is any question.


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bobndot

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Posted: 11/14/22 01:05pm Link  |  Quote  |  Print  |  Notify Moderator

Grp 27 wet cell : economical , will work well and charge using the converter you have.
I have used these batts and they worked fine for the 4 years i had them. Two grp 27’s will give you 160 ah and enough cca’s to start your Onan genny .
Correct me if I'm wrong , AFAIK, the Onan’s are usually factory wired off the house bank .
While off grid, these two batts ran my 25,000 btu furnace just fine throughout the winter . I was able to get through the night and the next morning with no issues.



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Posted: 11/14/22 02:53pm Link  |  Quote  |  Print  |  Notify Moderator

SCADAMAN29325 wrote:

Using chassis battery to start house generator.

Since I don't have a house battery yet, it may help with deciding on a house battery that does not need to start the generator.

Hmmm...


If your genny starter motor is already wired to the house battery location (obviously the genny output is wired to the house system/converter) there is zero need to change that. Any deep cycle/dual purpose 12V or a pair of 6V batteries will start the generator without issue.
It will not draw more amps than a deep cycle can produce reliably.
By the same token, if its somehow wired to the starting battery (for the engine/coach) that is fine too.


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