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Old 03-13-2016, 01:59 PM   #1
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Eextending battery life

I was told by a RV tech. that it was not a good idea to keep my coach plugged into a shoreline when it is parked at home because the batteries are not being exercised. he said I should unplug it for about a week, leave some lights on so the batteries will run down some, then plug it back in to recharge the batteries.
has anybody else heard of this? This is my 5th coach and I have always kept them plugged in while at home with no problems with the batteries as long as I check the water level periodically.
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Old 03-13-2016, 02:08 PM   #2
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IMO, that's bad advice.

Deep cycle battery life is measured in cycles.

If you cycle them every week, you are using them up for nothing.

Store them at float voltage, like you do, or disconnect them after a full charge for up to 4 or 5 months.
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Old 03-13-2016, 02:14 PM   #3
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Quote:
Originally Posted by twinboat View Post
IMO, that's bad advice.

Deep cycle battery life is measured in cycles.

If you cycle them every week, you are using them up for nothing.

Store them at float voltage, like you do, or disconnect them after a full charge for up to 4 or 5 months.
I agree with Twinboat. But proper charge rate and maintenance is the key. That said, these batteries should last 8-10 years.
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Old 03-13-2016, 05:55 PM   #4
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Makes on sense...
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Old 03-13-2016, 06:01 PM   #5
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Plugged in. Quality charger on float. Check water routinely.

Better than plugged in IMHO - on solar panel power with quality controller instead of shore power.
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Old 03-13-2016, 07:05 PM   #6
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Bad advice, leave them plugged in, especially if you have a smart charger.
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Old 03-14-2016, 09:28 AM   #7
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Bad advice, leave them plugged in, especially if you have a smart charger.
Ditto. Unplug part of the time if it is not a smart (3 or 4 stage) charger; otherwise leave it plugged in.
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Old 03-14-2016, 09:49 AM   #8
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That would e good advice if you had NiCd batteries. It is very bad advice for your lead-acid batteries.

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Old 03-14-2016, 10:18 AM   #9
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Does this guy also sell batteries?
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Old 03-20-2016, 10:03 AM   #10
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I agree with a good quality three stage charger, set properly for your battery bank (Check this, as not always set properly, especially on a used RV that may have had different type batteries installed.) Float will keep the battery topped off.

Now, saying that. Different battery types behave differently. Sulfating build up is a possibility while on extended float. Different batteries have differing levels of concern for this.

By cycling the batteries periodically, say down to 75% SOC and back up to full charge, will help reduce the sulfating effect. On our wet cell Trojans T125, I went with a stand alone Battery Minder that also automatically de-sulfated as required. Small investment, and frankly the charger in our 99 Bounder was not all that sophisticated.

So depending upon battery type, the advice to 'cycle' the batteries was not totally out in left field.

And yes, batteries do have a finite number of Life Cycles DoD 1000 is common. And the cycle down to say 75% SOC and back up to full charge - does use up some of those cycles!

Dang if you do, and possibly dang if you don't!

Best to all,
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Old 03-23-2016, 09:05 AM   #11
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You'll find some good information here. The first item under Lead Acid is how to prolong battery life.

Battery Information Table of Contents, Basic to Advanced
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