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Old 11-22-2015, 08:17 AM   #1
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Using aux TV batteries to charge AS?

We tow a 2010 AS International 27fb full time with a Nissan NV. We have solar, 300watts on top and 2 lifeline AGMs (300amphr) under the bed. The NV has factory wiring to add an auxiliary battery in the rear. Is it possible to add 2 more lifeline batteries to the rear of the NV which would be charged by the NV alternator to supplement our AS battery bank?
We do plan to add more panels as well.
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Old 11-22-2015, 08:30 AM   #2
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I'm underwhelmed by TV ability to charge batts

You might be better off adding more batts to the trailer, but since you want the same circa batts, I was thinking about hooking up an additional bank of batts with an A/B battery cutoff switch

Moot point for me as my 9 year old AGMs are done. So I'll be moving up from 2 to 3 batts.

You kinda have to use AGMs for more than two batts because venting that many would be a pain
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Old 11-23-2015, 06:08 PM   #3
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Thanks Dave! We don't *want* to add more batteries to the AS due to weight and space issues (even tho we'd be adding same said weight up front). The most interest we have is how to use the NV alternator to charge a TV battery bank that can supplement the AS batteries. Anyone?
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Old 11-24-2015, 08:19 AM   #4
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You'll need either a DC to DC charge controller or a battery isolation manager (BIM) like the one from Precision Circuits that are used on the Interstate vans.

Simply connecting AGMs to an alternator will eventually over charge them.


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Old 11-25-2015, 07:28 AM   #5
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Quote:
Originally Posted by lewster View Post
You'll need either a DC to DC charge controller or a battery isolation manager (BIM) like the one from Precision Circuits that are used on the Interstate vans.

Simply connecting AGMs to an alternator will eventually over charge them.


Lew Farber
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Lifeline Batteries**Magnum Inverters
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Thanks Lew! I'm glad to see your input here!

So if we can control the charge coming in to the agm's in the TV, what would be the best way to get the charge from the TV to the TT and into those batteries?
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Old 11-25-2015, 07:44 PM   #6
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Thanks Lew! I'm glad to see your input here!

So if we can control the charge coming in to the agm's in the TV, what would be the best way to get the charge from the TV to the TT and into those batteries?
I see 2 ways, though there may be others:

ē swap them out with the depleted ones in the trailer when needed
ē make up the required length of very heavy welding cable (length dependent) terminated with Anderson connectors for plug/play use.

ēA third option would be to use option 2, but add a 2 position marine battery selector switch into the mix. This will actually combine both of the first 2 options without having to physically move the batteries.
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