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Old 05-10-2015, 08:58 PM   #1
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Battery failure

A relative newbie to TT. We have replaced two batteries that have failed to charge. Our third battery now fails to charge. We returned from a three thousand mile trip three weeks ago. A continuous beep from a sensor alert resulted in me pulling the battery and attempting to charge it. It will not charge fully only going to 25%. Indication of some electrical issue causing the battery to deplete so low that it is damaged? Thanks for suggestions.
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Old 05-10-2015, 10:13 PM   #2
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When plugged into shore power does the battery read 13ish volts or show full on the battery status gauge indivating it is charging?
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Old 05-10-2015, 10:19 PM   #3
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I pulled the battery and am charging on shop bench with a charger. Reads 12 volt but stays at 25 %.
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Old 05-10-2015, 10:32 PM   #4
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Is the converter of trailer putting out a charging voltage? Some have fuses both sides of charging leads.
If your are charging battery now with stand alone battery charger give it time to charge the battery, check and see if any bubbling action in water.
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Old 05-11-2015, 07:42 AM   #5
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My guess is that your trailer's converter/charger is not doing its job.
Either a fuse is blown or the charging voltage is too low.

WFCO converters are notorious for not going over 13.6V and the batteries soon end up sulfated. Progressive Dynamics makes a drop in replacement for the WFCO.
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Old 05-11-2015, 09:55 AM   #6
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Are your batteries low on water?
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Old 05-11-2015, 12:43 PM   #7
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Need to use a digital multimeter to read battery voltage and use that reading to determine the state of charge of the battery once it has been resting (neither charging nor discharging) for several hours.
If they are flooded cell batteries, you can use a hydrometer to do the same thing more accurately.

Also, if you are travelling every day and rarely going onto mains power and therefore relying on charging from the engine alternator, it is very likely that you are not getting the battery anywhere near fully charged and depending on your power draw at night, they could be getting flatter and flatter as each day passes. Called batterycide.
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Old 05-11-2015, 09:03 PM   #8
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"Also, if you are travelling every day and rarely going onto mains power and therefore relying on charging from the engine alternator, it is very likely that you are not getting the battery anywhere near fully charged and depending on your power draw at night, they could be getting flatter and flatter as each day passes. Called batterycide."

This seems a likely analysis. Thanks.
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Old 05-11-2015, 09:05 PM   #9
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Water level down but not to plates. Added distilled water. Charger reads 11.5 v and 12 v after a few minutes of charging. Will leave on charger longer when home for exteeded time. If there is bubbling, does that mean the battery is fried?
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Old 05-11-2015, 09:35 PM   #10
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Quote:
Originally Posted by brulaz View Post
My guess is that your trailer's converter/charger is not doing its job.
Either a fuse is blown or the charging voltage is too low.

WFCO converters are notorious for not going over 13.6V and the batteries soon end up sulfated. Progressive Dynamics makes a drop in replacement for the WFCO.
the converter is an Iota DLS Series Converter/Charger.

The Progressive Dynamics website is quite informative. thanks.
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Old 05-12-2015, 06:46 AM   #11
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Quote:
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Water level down but not to plates. Added distilled water. Charger reads 11.5 v and 12 v after a few minutes of charging. Will leave on charger longer when home for exteeded time. If there is bubbling, does that mean the battery is fried?
No. It just means it's charging.

But you can over-charge your batteries as well as under-charge them.
The constant bubbling will evaporate water from the batteries and dry them out.

So after awhile once the batteries are fully charged (assuming they are ok and still accept a charge) the voltage should drop to a low number (13.2V ? depending upon the battery & charger) called the float voltage and the bubbling will stop. This voltage will maintain the batteries for a long time without harm.

Really, maintaining and charging batteries has been a quite a "learning experience" for me. They are tricky beasts.
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Old 05-12-2015, 06:56 AM   #12
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the converter is an Iota DLS Series Converter/Charger.

The Progressive Dynamics website is quite informative. thanks.
My understanding is that the Iota makes good units, but you would want the IQ4 option to really be able to use it. It's sort of equivalent to the Progressive Dynamics with the Wizard option.

Here's a discussion of the two:RV.Net Open Roads Forum: General RVing Issues: IOTA vs Progressive Dynamics
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Old 05-12-2015, 07:06 AM   #13
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The IOTA with IQ=4 Technology is supposed to be the equal of the Progrssive Dynamics 9200 without remote dongle.

In short: IT SHOULD CHARGE.

One thing that might affect is the Salesman Switch..May be labeled USE/Store or AUX On/Off or Disconnct this basicaly disconnects the house battery... If disconnected it can not charge.. If there are loads that bypass the switch.. It will still discharge.

Finally you have the amount of battery v/s the amount of load. That one I can not determine long distance. But what battery (Batteries) do you have for the house?
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Old 05-13-2015, 07:20 AM   #14
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I took the battery in to analyze. They put it on their tester/charger and it boiled over. i think I may be guilty as charged of "batterycide" as Tony Lee suggests.
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