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Old 09-13-2017, 11:04 PM   #21
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Quote:
Originally Posted by rmkrum View Post
If there is no shore power to the AS, it's no issue.
Ok, I understand. But in my use case I'm plugged in 24x7, so it would damage my batteries eventually. Which is why I'd like to disable that button if possible.
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Old 09-17-2017, 04:07 PM   #22
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Okay, so I used the external charger this weekend, and it reached 100% once. We lost power a couple of times so I used the batteries for a little bit while I setup the generator. Now, after two days, the batteries never reach 100% charge. The 100% light keeps blinking and it never turns solid (meaning it reached full charge).

What's going on?

I know that despite the batteries being in the Store position, there's still a draw on the batteries. Could this draw be preventing them from reaching 100%?

Any other ideas?

I had to disconnect the charger as I was unable to do a "permanent" install. The eyelets that came with the charger were too small. I had to order larger ones. Next weekend when I come back I intend to leave the charger permanently installed. But if it keeps charging forever never reaching 100%, isn't it doing the same thing the Airstream charger is doing? I thought this charger was supposed to be "smart".
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Old 09-18-2017, 07:32 AM   #23
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Hi

If the charger is monitoring current rather than voltage (or in addition to voltage) to work out the 100%, yes, the parasitic loads could mess it up.

The other basic issue is that it probably *assumes* there is a single battery out on the other end. The leakage of two batteries may be getting it confused. That would be really weird though.

The bigger question is "does it matter?". You would have to know a bit about the firmware in the charger to answer that question. Best guess is it really does not matter at all.

Bob
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Old 09-18-2017, 07:59 AM   #24
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Here's my plan.
Install a battery disconnect like the Perko's used in boats. (Off/On)
Then add a Battery Tender or other brand trickle charger just when the AS is stored.
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Old 09-18-2017, 09:28 AM   #25
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I think I may have purchased too small of a charger.

The 3500 is advertised as "up to 120ah", and since my batteries are 105ah, I thought I was fine.

I forgot I have TWO batteries, wired to make 210ah.

So it will take twice as long to charge THAT.

The G7200 is advertised "up to 230ah". I'm getting that one.
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Old 09-18-2017, 09:41 AM   #26
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FCStreamer, you did not buy too small of a charger, keep what you have.
The last 10% of the charge is pushed in at a lower amp rate in the .5 amp range. Thus can take a day or two to top the batteries off.
There might be a draw that is greater than that, which is keeping the charger from topping the batteries off.
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Old 09-23-2017, 10:30 AM   #27
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I installed the G7200. Charged overnight and I finally got the green light. Much better. I’ll use the 3500 for single batteries. I’ll leave the 7200 installed “permanently” on the AS.
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