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Old 10-03-2013, 03:03 PM   #15
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Yeah, 12.2V is about half charge, and about as low as you want to go as far as getting long life out of them. Also, dont leave them in that state for any length of time. Charge the to 100 % as soon as possible.
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Old 10-03-2013, 06:45 PM   #16
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How long to charge...


Depends on how big the battery plant is, the state of charge and the type and capacity of the charger.

We do not want to be able to fully charge the dead battery in a couple hours, too much.

Best is to not exceed 25 amps per installed string.

If you have chassis battery, and cabin battery of 2 x 2x 6 volt jars and all are charged at same time then three strings x 75 amps should be maximum rate of charge.

As the charge comes up rate will decline, then charging will be slower.

To get a battery completely happy it may need to float for a couple days to be true 100%charged.

Do not need that for storage.

By the way, alternator good charge source on highway, poor at idle, current low until rpm comes up.

A 150 amp unit will be very low at idle, high idle is fine, but engine drinks fuel and wear, best to use generator and on board charger, portable ones can be added too.
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Old 10-03-2013, 07:10 PM   #17
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IMHO, it would cost you less if you went to Walmart and purchased a decent battery charger plus you could leave it on the coach all night. Running the generator just to charge the batteries is not cost effective and it is also a slow process as most converters (120vac-12vdc) are designed to maintain a battery state, not bring up a low battery within a reasonable amount of time.
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Old 10-03-2013, 07:23 PM   #18
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IMHO, it would cost you less if you went to Walmart and purchased a decent battery charger plus you could leave it on the coach all night. Running the generator just to charge the batteries is not cost effective and it is also a slow process as most converters (120vac-12vdc) are designed to maintain a battery state, not bring up a low battery within a reasonable amount of time.
It would be a good excuse to exercise the generator ( under load of course )..
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Old 10-03-2013, 07:34 PM   #19
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IMHO, it would cost you less if you went to Walmart and purchased a decent battery charger plus you could leave it on the coach all night. Running the generator just to charge the batteries is not cost effective and it is also a slow process as most converters (120vac-12vdc) are designed to maintain a battery state, not bring up a low battery within a reasonable amount of time.
Can I leave it on the coach all night? Is it cool to be charging the batteries using a charger that is, in fact, plugged into the coach itself? Mine is in a storage unit with no access to shore power of any type.
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Old 10-03-2013, 08:28 PM   #20
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Can I leave it on the coach all night? Is it cool to be charging the batteries using a charger that is, in fact, plugged into the coach itself? Mine is in a storage unit with no access to shore power of any type.
The folks didn't read the entire thread before responding. You can't plug an external charger into a tree just run the genny 2 hours (probably already done by now), which will get you through the night to run the fridge. Tomorrow is a new day and the batts will get fully charged going down the road
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Old 10-03-2013, 08:33 PM   #21
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Unlikely on a 2006 National RV.
Is it not a Magnetek 950 50 amp converter charger? They are single stage devices.

Not sure. Just didn't think any mainstream manufacturer was using a multi-stage charger short of high stuff with inverter/chargers.
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Old 10-03-2013, 08:44 PM   #22
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Is it not a Magnetek 950 50 amp converter charger? They are single stage devices.

Not sure. Just didn't think any mainstream manufacturer was using a multi-stage charger short of high stuff with inverter/chargers.
I think National dumped Magnatek single stages in the early 2000's. They were certainly not using them in 06.
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Old 10-03-2013, 08:47 PM   #23
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My 2000' National Dolphin came with a Progressive Dynamics 9200.

Unless the previous owner swapped them out .
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Old 10-03-2013, 09:11 PM   #24
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My 2000' National Dolphin came with a Progressive Dynamics 9200.

Unless the previous owner swapped them out .
My '99 had the Magnatek boat anchor. I'm sure the PD 9200 didn't come into being for several years after that. The PD 9100 of course preceeded the PD 9200, which National used after dumping the Magnateks.
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Old 10-03-2013, 09:59 PM   #25
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The dataplate on the back-side of your frig will state the DC wattage draw when operating on propane and 120VAC. It must have DC voltage when operating_period. The PC board operates from DC voltage.

re, house battery charging. An RV technician who has been such for 22 years, told me he's never seen a MH that was not originally designed to re-charge the house battery while driving. I know the 1977 class A Allegro I owned back then re-charged house battery while driving. I doubt technology declined since then. Our present MH would not re-charge house batteries. That same technician located a faulty solenoid, replaced it, and the system now works as designed.
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Old 10-03-2013, 10:06 PM   #26
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The folks didn't read the entire thread before responding. You can't plug an external charger into a tree just run the genny 2 hours (probably already done by now), which will get you through the night to run the fridge. Tomorrow is a new day and the batts will get fully charged going down the road
Why is it that some folks just have to jab someone else... no place was it stated that he had NO AC power at his storage location...
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Old 10-03-2013, 10:28 PM   #27
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Getting ready for a trip tomorrow. Motorhome has been sitting a bit. Started up OK this morning but the panel showed bother house and chassis at 12.1 volts. I'm sitting here in storage trying to run the generator enough to bring the charge up enough so that the fridge won't kill it overnight when I come back to turn it on this evening. How long do I have to run the generator to "top off" the charge? 2006 National Seabreeze.
Your alternator puts out more amps than your generator powering the built-in charger.

If you want to run the generator it will take many hours.

To reduce the time needed to charge the battery bank fully, I would suggest using a minimum of a 15 amp or a possibly a higher amp portable charger plugged into a 120 VAC outlet and then hooked to your battery bank. By doing it that way, it will reduce the amount of time considerably.

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Old 10-04-2013, 03:37 AM   #28
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Why is it that some folks just have to jab someone else... no place was it stated that he had NO AC power at his storage location...
Really .

Read post #19. The post above the one you quoted.
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