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Old 03-24-2019, 04:40 PM   #1
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Float Charge Rate

Picked up my "new" 2004 Dolphin 34 ft. from the dealer last Friday and immediately went and spent a couple days at a state park near the dealership. We had full hookups, and everything went fine until I got home and noticed that the house batteries were dead. Checking them they were bone dry, which tells me that either the dealer never checked the water levels, the WFCO charger boiled them dry, or both. One battery was ruined, which I have now replaced, and the other seems to have survived.

Now that everything is working again I'm monitoring the charge rate, and so far the WFCO seems to be charging at 13.6 volts. I assume that this is probably too high for a continual rate and at some point it should drop down to a float rate of somewhere around 13.2V. Does this sound right?

My question is, what is a reasonable time before I should see the charge voltage drop. Both batteries were charged for several hours outside of the RV before I re-installed them, so should have a pretty good charge on them already... though I couldn't find my hydrometer so am just guessing how well they were really charged.

Is it safe to assume that if the charge rate does not drop I should consider replacing the WFCO? I've had good luck with PDI chargers before so would probably go that route.
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Old 03-24-2019, 07:27 PM   #2
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With leaving one questionable battery in the system, I don't think you can get accurate charging voltages.

What makes you think one battery survived after being charged dry ?

If its bad, you will end up with another overcharged battery.

My suggestion is to replace the one you didn't, then check voltage.
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Old 03-24-2019, 09:57 PM   #3
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What is the resting voltage of each battery?Resting voltage is sitting for at least a few hours after being charged.
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Old 03-24-2019, 10:31 PM   #4
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Quote:
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With leaving one questionable battery in the system, I don't think you can get accurate charging voltages.

What makes you think one battery survived after being charged dry ?

If its bad, you will end up with another overcharged battery.

My suggestion is to replace the one you didn't, then check voltage.
I reached that conclusion because I charged them separately and one charged normally and held a charge. The other one got hot while charging and didn't hold voltage afterwards.
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Old 03-25-2019, 09:07 AM   #5
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13.6 is the standard float charge voltage these days, so your WFCO is doing fine. My money says the dealer never looked at the batteries. Or didn't care about their condition because you didn't ask or inspect.


The bad battery will fool any charger into overcharging the better one. The bad battery sucks up the amps so the charger sends more.
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Old 03-25-2019, 10:26 AM   #6
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I'm sure the dealer left the coach plugged in and never checked the water before sale. I think if you really want to start with a level playing field, you need to replace the other battery so BOTH batteries are in the same condition. After that, add a battery watering system to prevent the biggest killer of batteries, low water.

Once everything is up to snuff, you can check on the proper operation of your charger. You don't say what WFCO model you have, it may have some adjustments.
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Old 03-25-2019, 10:43 AM   #7
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Quote:
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I'm sure the dealer left the coach plugged in and never checked the water before sale. I think if you really want to start with a level playing field, you need to replace the other battery so BOTH batteries are in the same condition. After that, add a battery watering system to prevent the biggest killer of batteries, low water.

Once everything is up to snuff, you can check on the proper operation of your charger. You don't say what WFCO model you have, it may have some adjustments.
What does WFCO stand for? Old guy that speaks English.
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Old 03-25-2019, 12:23 PM   #8
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What does WFCO stand for? Old guy that speaks English.
Its a brand name.
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Old 03-25-2019, 07:32 PM   #9
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The WFCO should drop back to 13.2vdc after 48 hours of NOT trying to bring up a battery. I've had four WFCO's...never hadda problem. It's jus' not the Ferrari of converters...but it's also not the Gremlin. Decent & reliable.



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Old 03-25-2019, 08:33 PM   #10
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Quote:
Originally Posted by Rkesselus View Post
What does WFCO stand for? Old guy that speaks English.
I had to look it up!
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Old 03-25-2019, 08:50 PM   #11
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OH Great. Now I have to look it up, LOL.


EDIT: I clicked on the link from above and sent WFCO an email and asked the question, what does WFCO stand for? I am guessing the CO is for Company but who knows, we'll see.
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Old 03-25-2019, 09:27 PM   #12
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Sitt'n here look'n at my battery monitor, in float it's showing 13.5........have added a LITTLE water once since 2014......
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Old 03-26-2019, 09:55 AM   #13
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Ok, thanks for the thoughts, y'all. I'll keep an eye on it. Is there usually an easy way to disconnect the charger when plugged into shore power for prolonged periods, a circuit breaker perhaps? The battery disconnect switch seems to only disconnect the coach from the battery without affecting the charger.
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Old 03-26-2019, 10:02 AM   #14
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Take a volt reading at the batteries with switch on, then with switch off.....
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