jpru5112
I have a 2008 20KW, I just put a new battery in it in December. I went out the other day to make sure everything was working on the Generator. I went to manually start it and "click click click".
I put my battery analyzer/charger on it, and it read "over charged" Long story short, the charger is putting out 19V to the battery and fried it. I bought a new battery and am attempting to locate a new charger locally. My question is: if I don't replace the charger now, how long will this new battery last. This hurricane is 2 days out and I'd rather wait until it's gone to replace the charger. I assume it would last a few months, I just need it to last a week or two. I'm not hooking up the new battery until the last minute before the storm hits.

Thanks,
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78buckshot
Without the charger the generator will run about 15 - 20 hours on a fully charged battery. If you connect a new battery to the system that is putting out 19 volts it will probably get you through the storm but it will do damage to the battery.
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Skip Douglas SkipD
Get a good quality 3-Ampere charger/maintainer if you can find one. If you cannot find this combination, get a regular charger that works at up to about 4 Amps and get a battery maintainer that works at 3A (or a bit less). Use the conventional charger to top up the battery and then swap it out for the maintainer. Leave the maintainer on and powered as long as you have safe time for.
Skip Douglas
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jpru5112
SkipD;n59160 wrote:
Get a good quality 3-Ampere charger/maintainer if you can find one. If you cannot find this combination, get a regular charger that works at up to about 4 Amps and get a battery maintainer that works at 3A (or a bit less). Use the conventional charger to top up the battery and then swap it out for the maintainer. Leave the maintainer on and powered as long as you have safe time for.


I have up a 3 amp maintainer, I'm thinking about hooking it up and using the outlet at the generator to power it. That outlet is only live when the generator is running, but since I have a brand new battery, it will start the generator no problem, then once it running its charging. I think this might work to get me through the storm and not cause damage to the new battery. I just need to disconnect to (over)charger in the ATS. Hopefully it has a fuse I can pull.
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78buckshot
Your transfer switch probably has two fuses, N1 & N2, these are not serving the charger if the unit is wired correctly. Is the charger mounted inside the transfer switch?, if so disconnect the line voltage from it, should be live all the time so be aware.
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exrace
I picked up the "Battery Tender Power plus 3 Amp Charger" and the tender works perfectly.
Found one at Costco online for cheaper than any other location.

I ran a 20 amp branch circuit during my install and is plugged into that circuit.
Simple and is not overcharging. Simple status lights too.

Still need to permanently mount the tender.
I am leaning towards mounting near the serial number sticker so I can easily see the status when I open the cover.
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Skip Douglas SkipD
exrace;n59196 wrote:
I picked up the "Battery Tender Power plus 3 Amp Charger" and the tender works perfectly.
Found one at Costco online for cheaper than any other location.
That 3A Battery Tender is a special model that is sold only to Costco. I saw a similar model somewhere else but at 2 or 3 times the price. I bought 4 of the units from Costco.
Skip Douglas
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exrace
Exactly what I found. Even with a non-member charge the unit was still cheaper. Thank you for posting the details before.
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restosud
keep an eye on battery water level when using battery tender brand charger/maintainer.
i've seen a few boil them dry.
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exrace
What is nice about this tender is the firmware monitors the battery voltage and stops charging. Confirmed this with a digital volt/amp meter.
The tender truly rests unlike some chargers which have no firmware programming and can boil a battery.
Add a AGM battery and you have a troublefree setup.
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GMc
exrace;n59220 wrote:
What is nice about this tender is the firmware monitors the battery voltage and stops charging. Confirmed this with a digital volt/amp meter.
The tender truly rests unlike some chargers which have no firmware programming and can boil a battery.
Add a AGM battery and you have a troublefree setup.


Is this the one you purchased?



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exrace
Yes. That is the one.
The case has holes through so case can be mounted.

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GMc
Thanks
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