Part Time AGM Battery Maintainer

Almot wrote:
500 cycles of life is a generic number for 80% cycle, i.e. down to 20% SOC. It could die sooner - or later. The end of life, I think, is considered when it doesn't hold more than 50% of nominal.

I see you are online. Will you tell me what battery cycles have to do with the make and model of batteries you have. Why is is so difficult to answer my question directly?:S

mena661 wrote:

harold1946 wrote:

WRONG!!!!:M The average days of temperatures over 100 is 76.

WRONG!!!! :M :S :S

http://www.wrh.noaa.gov/psr/general/history/index.php?page=100deg

Almot wrote:

I knew that people would not read, as usual :) ... To get 25% charge drop in 2 months, it has to be over 100F for 2 months continuously, every single hour, day and night. Not just 2 or 3 months a year with daily max over 100F.

Gotcha.

Got you also. Are you trolling again or just looking for someone to call a troll? Are you still recommending that an inverter/charger be mounted directly above a generator? You said I was troll and blocked me, now you must have changed your mind. As per usual you did not comprehend what Almot said. Where is it that temperatures exceed 100 24/7?
"Those whom think they know it all are a hindrence to those who do"

smkettner wrote:
Could fully charge the AGM and just put it in the bottom of your garage fridge :B

That's a neat idea.

500 cycles of life is a generic number for 80% cycle, i.e. down to 20% SOC. It could die sooner - or later. The end of life, I think, is considered when it doesn't hold more than 50% of nominal.

Could fully charge the AGM and just put it in the bottom of your garage fridge :B

harold1946 wrote:

WRONG!!!!:M The average days of temperatures over 100 is 76.

WRONG!!!! :M :S :S

http://www.wrh.noaa.gov/psr/general/history/index.php?page=100deg

Almot wrote:

I knew that people would not read, as usual :) ... To get 25% charge drop in 2 months, it has to be over 100F for 2 months continuously, every single hour, day and night. Not just 2 or 3 months a year with daily max over 100F.

Gotcha.

DougE wrote:
I have a Sear Platinum Group 34 AGM battery I use as an auxiliary battery for my portable 12v electric refrigerator. It runs the fridge when parked overnight (or for a couple of days parked) to take that load off of the vehicle battery. In the month or two when it is not being used between trips I have purchased a CTEK Multi US 4.3 Charger battery maintainer. Is it really necessary to run the CTEK 24 hours a day? It would be a simple thing to put the maintainer on a timer and just run it a couple of hours a day.

I would let it run 100% the first week. Then if you want to put it on 2 hours a day that is fine. I would still disconnect a cable unless the charger is over two amps.

Almot wrote:
Harold1946: my manufacturer is UPG (re-branded Panasonic). But this doesn't matter, same monthly drop of charge at ~3% at 68F and ~12% at 104F you will find in other brands as well, like Deka for example. Deka doesn't say that discharge below 60% will reduce the capacity, but you should understand that capacity is decreasing a little with every cycle of charge-discharge, and the deeper is the cycle, the more it's decreasing.

Phoenix, AZ averages 90+ days a year over 100F.

I knew that people would not read, as usual :) ... To get 25% charge drop in 2 months, it has to be over 100F for 2 months continuously, every single hour, day and night. Not just 2 or 3 months a year with daily max over 100F.

I already understand it. Most are designed for 500 cycles of battery life. Just never heard of one that makes that statement.
If it did not matter I would not have asked. It matters to me.

Harold1946: my manufacturer is UPG (re-branded Panasonic). But this doesn't matter, same monthly drop of charge at ~3% at 68F and ~12% at 104F you will find in other brands as well, like Deka for example. Deka doesn't say that discharge below 60% will reduce the capacity, but you should understand that capacity is decreasing a little with every cycle of charge-discharge, and the deeper is the cycle, the more it's decreasing.

Phoenix, AZ averages 90+ days a year over 100F.

I knew that people would not read, as usual :) ... To get 25% charge drop in 2 months, it has to be over 100F for 2 months continuously, every single hour, day and night. Not just 2 or 3 months a year with daily max over 100F.

mena661 wrote:

Almot wrote:
Though I doubt there is ay place in the US that can be that hot for that long.

Phoenix, AZ averages 90+ days a year over 100F. I would imagine that most of the southwestern, low desert areas do also.

WRONG!!!!:M The average days of temperatures over 100 is 76.