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Old 09-01-2016, 06:41 PM   #1
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Battery Life

So my 8 house batteries are toast after 3 yrs
GC2 - XHD 232 lead acid by Interstate.
The coach sits for 3 months at a time on power. I'm thinking my Interlec charging system is set too high as the batteries are gassing, bulging and terminals are corroded.
Would I be better just disconnecting the batteries while I'm storage or modifying the charging figures
Currently I've got bulk 14.4 absorb 15.3 and float 13.4
Where am I going wrong



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Old 09-01-2016, 06:51 PM   #2
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15.3 for absorb sounds way high.

Interstate specs page for GC2:

http://www.batteries-faq.com/activek...questionid=101


Multiply 6 times "voltage per cell" numbers for 12 volt chargers gives:

BULK & ABSORB = 14.46 volts

FLOAT = 13.38

EQUALIZE = 15.6
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Old 09-01-2016, 06:52 PM   #3
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Your voltages are exactly what interstate says is optimum. What are the water levels in the batteries? Have you ever let the water level go below the plates ?
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Old 09-01-2016, 06:54 PM   #4
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Old 09-02-2016, 11:52 AM   #5
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Like Bluepill says, that absorb figure seems way high, but I dont think thats user adjustable.
Your float voltage is right where it should be, so I don't see you doing anything wrong.
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Old 09-02-2016, 12:48 PM   #6
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Battery Life

Bluepill How did you find the link to your page? From Google ? It doesn't seem to be linked from the menu, so I am suspect that it's an old page.

http://www.batteries-faq.com

Look at the section of charging. The page you linked to is not accessible from this page.

The page I went to lists 2.55 VPC for the absorb voltage.
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Old 09-02-2016, 01:01 PM   #7
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You can quote all the settings you like, but surely this - "So my 8 house batteries are toast after 3 yrs" and "the batteries are gassing, bulging" is the clue that something is not right.
Could be the OP is hammering the batteries too hard when he is out on the road so they have died prematurely and now the charger is fighting a losing battle to get them fully charged, or the charger is holding the first two stages too long and not going into float mode, or float mode is way too high despite what it is set to.
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Old 09-02-2016, 01:12 PM   #8
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Quote:
Originally Posted by Tony Lee View Post
You can quote all the settings you like, but surely this - "So my 8 house batteries are toast after 3 yrs" and "the batteries are gassing, bulging" is the clue that something is not right.
Tony Lee
I agree.
My coach is currently 2 years on the 3rd set of batteries.
(The 1st and 2nd set each lasted 9 years).
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Old 09-02-2016, 01:22 PM   #9
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Quote:
Originally Posted by pasdad1 View Post
Bluepill How did you find the link to your page? From Google ? It doesn't seem to be linked from the menu, so I am suspect that it's an old page.

http://www.batteries-faq.com

Look at the section of charging. The page you linked to is not accessible from this page.

The page I went to lists 2.55 VPC for the absorb voltage.

#5 under "Recent Entries" (bottom half of page) from your link above.

Interstate Batteries FAQ

Note that this is specifically for IBS "GC2" batteries that the OP mentions. It may not be valid for other types.


Tony makes a good point. You can never assume that the charger is actually performing to spec.
After the batteries are replaced, it should be monitored from time to time. Personally, I would prefer a charger with an absorb voltage no higher than 14.8 and a fourth stage equalization of about 15.5 volts. Interesting that Trojan recommends 16.2 volts for equalization, but I would be concerned for my 12 volt connected electronics at that level. Just MHO.
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Old 09-02-2016, 04:30 PM   #10
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Bluepill look at charging batteries #1 then scroll towards the bottom. It also lists GC2 XHD batteries but the absorb is increased to 2.55vpc
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Old 09-02-2016, 04:35 PM   #11
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The Interstate U-2200 batteries in our '02 DSDP lasted just one month short of 10 years and were still good enough to go through the night with no problems.
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Old 09-02-2016, 05:41 PM   #12
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How far do you discharge the batteries when you are on the road? Anything below 12.2 VDC (50%) will shorten the life. I have left batteries uncharged many times for 6 months.
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Old 09-03-2016, 07:13 PM   #13
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I generally don't boon dock so the batteries never get discharged.
However since the coach is regularly in storage I can't say if it gets left off power for any length of time
2 years ago it was supposed to be on power in storage in LA but I discovered on arrival that they were using my generator to too up the batteries - so could have been dead flat a few times in the 4 months it was there - I changed storage facilities.
after that.


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Old 09-03-2016, 07:20 PM   #14
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So picked up the coach last night - midnight and this morning drove 200 miles.
It was hot so I'd been running the generator.
I turned off the generator and noticed the alternator wasn't charging the batteries. Dam.
The service centre replaced all the battery leads as they were stuffed.
I'll have to get out my trusty multimeter to test the alternator output- in the mean time I guess the genny will be doing the work.
There wouldn't be a fuse on the alternator or some silly reason it's not charging? Can't image it's failed. Bit of a coincidence.


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