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Old 12-28-2015, 11:25 AM   #1
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Smile Battery charging system for AGM size 27 sealed batterys.

I am going to replace my old interstate batteries (deep cycle)with two size 27 deep cycle AGM sealed units. I believe my present charging system is original equipment. Will it handle my new batteries when it comes to charging?
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Old 12-28-2015, 12:39 PM   #2
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Yes, it will handle it, but most here, me included would recommend you replace your original Univolt with a new three stage converter/charger which will not only charge your batteries better, but will prolong their life a lot.

Common recommendation is a Progressive Dynamics PD 9245 (45 amp) which will do you just fine. Around $200. best converters.com is a good source.
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Old 12-28-2015, 01:09 PM   #3
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I also have a PD unit mine is a 55 amp that I charge two 6 volt golf cart batts. It works very well. The next step up would be a Magnum unit that can be programed for just about any battery. The but here is the cost at $1700.00 to 2000.00 they are heavy and more difficult to install.
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Old 12-28-2015, 01:20 PM   #4
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Before I upgraded to PD I used a portable 3 stage charger just be sure to have the battery disconnect set to store before hooking it up. The stock charger/converter can ruin the battery if you don't keep a close eye on the state of charge on the battery.
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Old 12-29-2015, 12:10 PM   #5
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I am atill operating on the stock converter on my '05 Classic. I replaced the original wet cells in 2008 with a pair of group 31 AGM batteries which will probably be replaced next year.

I assume that is good battery life even for AGM's. Would I benefit by replacing my converter?

Dwight
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Old 12-29-2015, 12:52 PM   #6
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Maybe some one with more knowledge could weigh in here, but I believe the charging voltage is different for AGMs....a bit lower!??? My solar panel is still set up for the AGMs it was originally installed for; and I only get about 12.8 volts on float, for my Lead Acid deep cycle battery
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Old 12-29-2015, 01:13 PM   #7
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AGM Battery Charging

Here is what a Trojan 12 V AGM takes for charging:

http://www.trojanbattery.com/pdf/Trojan_QSG_AGM.pdf


http://www.trojanbattery.com/pdf/Trojan_QSG_AGM.pdf
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Old 12-29-2015, 01:21 PM   #8
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Converter Replacement

Quote:
Originally Posted by 16595 View Post
I am atill operating on the stock converter on my '05 Classic. I replaced the original wet cells in 2008 with a pair of group 31 AGM batteries which will probably be replaced next year.

I assume that is good battery life even for AGM's. Would I benefit by replacing my converter?

Dwight
I replaced the converter on my 2005 Classic with a Progressive Dynamics PD9260 60 Amp Converter that I purchased from Vintage Trailer Supply for $172.99 plus shipping last March. Previously I was getting about three years life out of my wet sell batteries and now hope for longer life. I keep my AS plugged in at home all of the time when it is at home.

Dennis
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Old 12-29-2015, 04:21 PM   #9
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So group 27 is the size? Didn't know that.
Wondering which batteries are best to buy- thought about Optima, but someone said Lifeline are better-
Someone else said current inverter won't charge AGM batteries-
What do I do?
New converter and new AGM batteries?
How much is a converter? Which converter?
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Old 12-29-2015, 04:29 PM   #10
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Nt sure what the consequences are (if any), but both Lifeline and Trojan recommend approx 14.5 VDC for bulk/absorption charging with a float level of 13.2. The common 4 stage chargers are set for wet cells with bulk of 14.6, absorption of 13.8 and float of 13.2.
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Old 12-29-2015, 05:28 PM   #11
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AGM Battery Charging

It sometimes is hard to do an apples to apples comparison (or a battery to charger compare). Here is how I believe the Progressive Dynamics PD9000 series compares to what the Trojan AGM battery requires as an example:

Bulk Absorption Finish Float
AGM Battery 14.4 14.1 - 14.7 14.7 13.5

Charger 14.4 13.6 14.4 13.2

With 12.84 V being 100% charge for the Trojan AGM battery, it looks to me like the Progressive charger would not harm the batteries, would take a little bit longer to charge them (not as aggressive a charge as the batteries would take in Absorption mode). The Finish or Equalization Mode is a little low so you may not be keeping battery stratification under control. This could be handled by using a conditioning charger at home every 2 months. I don't know if the 0.3 V float difference is an issue or not.

Best bet is to call Progressive and the battery manufacturer and compare their answers as to whether or not the two products specifications are compatible or what issues any limitations may be causing you to have to live with.

PD9200 Series RV Power Converters

Charge Wizard RV Battery Charging

http://www.trojanbattery.com/pdf/Trojan_QSG_AGM.pdf
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Old 12-29-2015, 05:40 PM   #12
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i just got a aimes 2000w converter/inverter with built in xfer switch recently from amazon and it seems to be working pretty well- it has selections for both agm types and other types so the charge cycle is correct.
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Old 12-29-2015, 06:03 PM   #13
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I can't address other battery types as I do not install them, but Lifeline AGM batteries require a bulk/absorb charger of 14.2-14.4 VDC and a float charge of 13.2-13.4VDC. Many 'smart' converter/chargers approach these values, but never attain them with most being too high.

The only way to reach the required voltage levels for Lifeline AGMs is to use a programmable charging system like a Magnum or other fully programmable inverter/charger. There are several marine chargers that have selectable charging profiles for differing types of battery systems, but they still 'approximate' the batteries' voltage requirements.
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Old 12-29-2015, 06:22 PM   #14
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Quote:
Originally Posted by idroba View Post
Yes, it will handle it, but most here, me included would recommend you replace your original Univolt with a new three stage converter/charger which will not only charge your batteries better, but will prolong their life a lot.

Common recommendation is a Progressive Dynamics PD 9245 (45 amp) which will do you just fine. Around $200. best converters.com is a good source.
My post #2 is in error when I said it would handle it. On re reading your OP I see you are putting AGM batteries in, and they definitely should have a different converter/charger than supplied originally.

Sorry for my error.
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