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countrykids

Minnesota

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Posted: 08/18/20 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

When leaving a campground with partially drawn down house batteries, the engines alternator will slowly recharge them.

Can I charge those batteries faster by starting the in house generator at the same time charging from two sources?


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Bobbo

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Posted: 08/18/20 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

Short answer: yes.
Long answer: yes, absolutely.


Bobbo and Lin
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rk911

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Posted: 08/18/20 07:48pm Link  |  Quote  |  Print  |  Notify Moderator

what he said. ^^^^


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enblethen

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Posted: 08/18/20 09:14pm Link  |  Quote  |  Print  |  Notify Moderator

You may want to check your converter to see what kind of output it is. It may even pay to replace with a higher output.
Genset through the converter will give more charge combined with alternator.


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pianotuna

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Posted: 08/19/20 02:17am Link  |  Quote  |  Print  |  Notify Moderator

Yes.

However, a dc to DC boost device added between the alternator and the house batteries may be just as fast.

I added a 2nd charging path using #8 wire--and I have manual control of the charging solenoids.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

RJsfishin

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Posted: 08/19/20 06:23am Link  |  Quote  |  Print  |  Notify Moderator

No. depending on converter output and alternator output.
My 140 amp alternator will charge much faster than my PD 45 amp converter.
And 2 different charging sources will usually fight each other. The one w/ the highest voltage will do most all the charging


Rich

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theoldwizard1

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Posted: 08/19/20 07:12am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

However, a DC to DC boost device added between the alternator and the house batteries may be just as fast.

Concur ! Modern vehicle charging systems reduce the alternator voltage to about 13.2V shortly after the engine starts. This will never fully recharge a house battery bank. You need a DC-DC charger.

pianotuna wrote:

I added a 2nd charging path using #8 wire--and I have manual control of the charging solenoids.

Re-read the above.

Yes larger gauge wires helps, but you will never be able to get a house battery bank back to 100% SOC on 13.2V !

Bert the Welder

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Posted: 08/19/20 11:10am Link  |  Quote  |  Print  |  Notify Moderator

Good question and was surprised reading you could....then read on, and you can't.....but doesn't diminish from it being an interesting question.....


"> 1998 GMC 2500, 10.5 Okanagan, My better/smarter half, George and Finnegan(APBT), all I need.


pianotuna

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Posted: 08/19/20 11:35am Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

pianotuna wrote:

However, a DC to DC boost device added between the alternator and the house batteries may be just as fast.

Concur ! Modern vehicle charging systems reduce the alternator voltage to about 13.2V shortly after the engine starts. This will never fully recharge a house battery bank. You need a DC-DC charger.

pianotuna wrote:

I added a 2nd charging path using #8 wire--and I have manual control of the charging solenoids.

Re-read the above.

Yes larger gauge wires helps, but you will never be able to get a house battery bank back to 100% SOC on 13.2V !


When I put in the 2nd charging path I had identical batteries for house and starter (marine cycle). I did see over 70 amps of charging.

Also, at that time, getting a dc to DC charging device was pretty much unheard of.

Now that I have AGM telco house bank and an AGM starter, my solar sends energy to the engine--so I get almost no alternator charging.

dougrainer

Carrolton, Texas

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Posted: 08/19/20 12:26pm Link  |  Quote  |  Print  |  Notify Moderator

It REALLY depends on how long you drive. If over 4 hours the Chassis alternator WILL fully charge the Coach batteries. Doug

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