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Old 04-24-2016, 11:31 AM   #21
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Even with the PD 4655 the charger never gets to storage mode just stays at normal mode of charging at 13.6 volts. I have not got the new batteries yet as I hate to make another 100 trip to the dealer so will have till wait till mid may for an appointment for other things.

Should I let the batteries set for a while then put it boost mode?

Thanks Dave
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Old 06-15-2016, 06:26 PM   #22
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Lewster is right on. About 12.2 volts is 50% charge in an AGM or flooded 12 volt DC battery. To get to the estimated state of charge the batteries need to be resting with no loads in or out. They should rest for an hour or two to settle near their true state of charge. That is why a SOC meter is so important to battery management. They give state of charge based on amps used and amps restored. It is very seldom that you will be reading your battery voltage after completely resting them. A SOC meter is only as good as the parameters you set up for it.
I've been reading some of the posts relative to batteries to try to get a better understanding. I have older analog voltmeter which I'm beginning to believe is not accurate enough to read tenths (unless I'm not using it correctly). I read in your post about a SOC meter. I have no idea what that is. Could you (or someone) provide a description and some information?

Thanks!
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Old 06-15-2016, 07:02 PM   #23
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Old 06-15-2016, 07:02 PM   #24
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This might help.


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Old 06-15-2016, 07:39 PM   #25
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For long life try to keep your batteries at least at 50% state of charge.
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Old 06-15-2016, 08:02 PM   #26
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Its not really the depth of discharge.... its how long you leave it there and not bring it back to full!
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Old 06-16-2016, 04:53 AM   #27
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For long life try to keep your batteries at least at 50% state of charge.
Thanks. And just what is a SOC meter?
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Old 06-16-2016, 05:32 AM   #28
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SOC = state of charge
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Old 06-16-2016, 06:16 AM   #29
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All I can add is I've not looked up any manufacturers specs recently, however, when I was in an industry that used 100,000's of 12v deep cycle batteries we were advised to discharge batteries to 0% and re charge prior to putting them to sleep for winter storage. The golf car industry routinely discharges and re-charges these batteries yearly and despite daily use drawing batteries well below 50% levels they come back and last 4-5 years, in most cases. My group of employees and distributors routinely maintained over 80,000 batteries yearly.

I called one of my former technicians and the industry is still doing this today. We started putting in the AGM product as an option and I'm not sure what they are doing with these, but Trojan and Interstate both got the discharge and re-charge program yearly.

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Old 06-16-2016, 02:22 PM   #30
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SOC = state of charge
Thanks. Now I need to research SOC meters. Do others find this a useful device?

In my trailer it shows level of charge by the color indicator on the monitor. I'm assuming this is not a very accurate indicator. Is that correct?
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Old 06-16-2016, 02:26 PM   #31
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Just buy a simple cigarette lighter plug in volt meter. Leave it plugged in all the time to see your soc at a glance. This is not rocket science. After a while youll instinctually know just where you are!
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Old 07-13-2016, 08:35 PM   #32
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Just buy a simple cigarette lighter plug in volt meter. Leave it plugged in all the time to see your soc at a glance. This is not rocket science. After a while youll instinctually know just where you are!
I ordered one of these meters that plugs into the cigarette lighter from Amazon. I took about four weeks to get it but it works great.

Thanks for the recommendations.
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Old 07-15-2016, 03:05 PM   #33
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Even with the PD 4655 the charger never gets to storage mode just stays at normal mode of charging at 13.6 volts. I have not got the new batteries yet as I hate to make another 100 trip to the dealer so will have till wait till mid may for an appointment for other things.

Should I let the batteries set for a while then put it boost mode?

Thanks Dave




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Old 07-15-2016, 03:07 PM   #34
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It takes my pd4655 a couple of days (at least)before it goes to float mode. I have 260 AH of lifeline AGMs


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