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newguy
I wonder if using an AGM or GEL battery will have less likelyhood of exploding vs. the flooded acid battery?
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johnc
Newguy: Read back thru the exploding battery threads. I think there are 3 of them. One of the members is a battery expert (been in the battery business for years). You may be able to contact him.
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Dave Carney
Well, that's enough for me. Converted to a battery tender plus today. :)
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johnc
I was reading thru some of the installation threads. One post was about a battery charger for a liquid cooled generator. Seems the liquid cooled models have a different charging system than the air cooled models. Or is this Generacs new, better charging system than their 2 amp trickle charger? That's better than admitting a problem, I guess.
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pcfrisch
The battery minder plus seems to work fine so far. Since I switched this fall, I had lost power twice for a total of 65 hours generator run time with no problem.
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xk8driver
Two Exploding Batteries in a 4390-03!

OK, I've discovered this forum after I've [B]had [/B]two batteries explode in my Model 4390-03 Generac (Serial # 4058269) installed in 2005. The first one exploded in September 2008. I chalked it up to a bad battery and bought a recommended replacement (Autocraft Silver Type 26). I also checked the charging voltage and it was 14.1 vdc.

Well, I went out last weekend (Nov 2010) after I realized the generator had not done its weekly run. I opened up the unit and found another exploded battery...This seemed like something more than a fluke. I then started looking on the web and found a number of people complaining about this very problem. I've already order a Battery Tender and will put it in next week. As an electrical engineer I'm puzzled by the lack of interest by Generac in this issue. I'm not even bothering to contact them since they don't seem to answer anybody. I agree with Bill L. It will take someone getting hurt and an attorney to get their attention...Sad...they were a great company at one time.
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Canada_Guy
xk8driver;7765 wrote:
I also checked the charging voltage and it was 14.1 vdc.


Anything above about 13.2 vdc long term float voltage on a wet cell batery will result in fluid loss and ultimatly, battery failure.

This should be added as a maintenace checklist item.
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ebellinder
Measured battery float voltage on 2005 4390-3

Guys

For what it is worth I just put a Fluke 87 on my battery that I replaced this past October and I have a float voltage of 13.86 volts

Have not had a battery issue to date but I do change the battery every 24 months as a precaution

Currently have an excide battery in place
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Skip Douglas SkipD
ebellinder;7778 wrote:
Guys

For what it is worth I just put a Fluke 87 on my battery that I replaced this past October and I have a float voltage of 13.86 volts

Have not had a battery issue to date but I do change the battery every 24 months as a precaution

Currently have an excide battery in place
Have you been losing electrolyte level over time? Typically it happens at that voltage.

I have used a Schumacher battery maintainer to keep my generator's battery charged for several years and have not had to add any water to it since I started using the battery maintainer instead of Generac's charger.
Skip Douglas
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johnc
My Battery Tender Plus charges at a steady 13.1 VDC when needed. Haven't had to add water in 2 years since retrofit.
Good info by Canada Guy.
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xk8driver
SkipD;7779 wrote:
Have you been losing electrolyte level over time? Typically it happens at that voltage.

I have used a Schumacher battery maintainer to keep my generator's battery charged for several years and have not had to add any water to it since I started using the battery maintainer instead of Generac's charger.


The batteries have been "Maintenannce Free" so I could not check the fluid level. I have a Battery Tender on order and will bypass the generator charger.
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Skip Douglas SkipD
xk8driver;7784 wrote:
The batteries have been "Maintenannce Free" so I could not check the fluid level. I have a Battery Tender on order and will bypass the generator charger.
Based on my experience, the Battery Tender should be just what is needed.

Do make sure that you totally disable the original charger. Mine had two plugs connecting it into the system and I pulled both of them off the charger.

Depending on what sort of generator you are running, you may want to consider running a branch circuit from the backed-up power to the generator housing to power the new charger. That's what I did to maintain charging on both utility and generator power.
Skip Douglas
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xk8driver
SkipD;7785 wrote:
Based on my experience, the Battery Tender should be just what is needed.

Do make sure that you totally disable the original charger. Mine had two plugs connecting it into the system and I pulled both of them off the charger.

Depending on what sort of generator you are running, you may want to consider running a branch circuit from the backed-up power to the generator housing to power the new charger. That's what I did to maintain charging on both utility and generator power.


I'm ordering a 25' extension for the Battery Tender 12vdc output line. I'll keep it in the garage powered by a backed up outlet. Should work great! Thanks for all the good comments...
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