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Old 04-09-2016, 04:32 AM   #15
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NoResults,
How did you make out at the dealer?
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Old 04-09-2016, 05:43 PM   #16
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They told me that the batteries are fine just need to charge them for three days to get them fully charged.

I had not let them charge for more than a day thinking, after reading these forums that it was not good to leave them charging.

They suggested that I buy a replacement charger for $500.00

I am looking at the replacement for the Paralax 8355 but not sure I think it is the Progressive Dynamics 4655 but have not received a reply to my email to Best Converters.

Can any one suggest another source that could confirm if this is the proper replacement.

I am sure I can do it myself and save $300.00

Dave
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Old 04-09-2016, 05:53 PM   #17
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Use the Prog. Dyn. PD 4655 if you have 30 amp service in the trailer. Use the PD 9260 which is a deck mount unit if you have 50 amp service.

These are my go to units when upgrading the Airstream's charging systems when I don't use a Magnum inverter/charger.


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Old 04-09-2016, 06:28 PM   #18
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Lewster is right on. About 12.2 volts is 50% charge in an AGM or flooded 12 volt DC battery. To get to the estimated state of charge the batteries need to be resting with no loads in or out. They should rest for an hour or two to settle near their true state of charge. That is why a SOC meter is so important to battery management. They give state of charge based on amps used and amps restored. It is very seldom that you will be reading your battery voltage after completely resting them. A SOC meter is only as good as the parameters you set up for it.
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Old 04-21-2016, 04:11 PM   #19
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Dealer says to keep me happy they will exchange the batteries. They also state that a drain to 12.2 from fully charged in 5 hours is normal? If they are correct should I just forget these batteries and bite the bullet for AGM batteries. I was not planning on adding solar at the present so the price and weight of the agm batteries need to be ruled out for the present.

How long should a fully charged battery stay charged from 12.6 when charged with no load other than the co2 detector.

PS: I did upgrade the converter to the 4655 with charge wizzard.

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Old 04-21-2016, 04:34 PM   #20
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Their answer was way too vague. Battery draw is wholly dependent on the load being placed on them.

The battery industry used what is called the '20 hour rate' for battery capacity.

If you gave a pair of Gp. 24 Interstates, their 20 hour rate is 80 amp/ hours. Since you have 2 in parallel, you have a total of 160 amp/hours of which 50% is practical for usage.

5 hours of run time on fully charged batteries equates to a continual 16 amp load (80/5=16). That is a whole lot of battery draw continuously.

Even your energy hog furnace will not draw that amount.

Since you now have a quality converter, use them and see how it goes. Just be sure to FULLY recharge them ASAP after a deep draw and watch your water level.


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Old 04-24-2016, 11:31 AM   #21
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Even with the PD 4655 the charger never gets to storage mode just stays at normal mode of charging at 13.6 volts. I have not got the new batteries yet as I hate to make another 100 trip to the dealer so will have till wait till mid may for an appointment for other things.

Should I let the batteries set for a while then put it boost mode?

Thanks Dave
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Old 06-15-2016, 06:26 PM   #22
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Quote:
Originally Posted by Tn Traveler View Post
Lewster is right on. About 12.2 volts is 50% charge in an AGM or flooded 12 volt DC battery. To get to the estimated state of charge the batteries need to be resting with no loads in or out. They should rest for an hour or two to settle near their true state of charge. That is why a SOC meter is so important to battery management. They give state of charge based on amps used and amps restored. It is very seldom that you will be reading your battery voltage after completely resting them. A SOC meter is only as good as the parameters you set up for it.
I've been reading some of the posts relative to batteries to try to get a better understanding. I have older analog voltmeter which I'm beginning to believe is not accurate enough to read tenths (unless I'm not using it correctly). I read in your post about a SOC meter. I have no idea what that is. Could you (or someone) provide a description and some information?

Thanks!
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Old 06-15-2016, 07:02 PM   #23
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Old 06-15-2016, 07:02 PM   #24
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This might help.


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Old 06-15-2016, 07:39 PM   #25
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For long life try to keep your batteries at least at 50% state of charge.
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Old 06-15-2016, 08:02 PM   #26
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Its not really the depth of discharge.... its how long you leave it there and not bring it back to full!
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Old 06-16-2016, 04:53 AM   #27
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For long life try to keep your batteries at least at 50% state of charge.
Thanks. And just what is a SOC meter?
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Old 06-16-2016, 05:32 AM   #28
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SOC = state of charge
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