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Old 09-29-2014, 11:31 PM   #29
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I spoke to randy at best converter


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Old 09-30-2014, 12:42 AM   #30
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If you currently have a Parallax 7355, you should be good replacing it with a Progressive Dynamics 4655. Here's a helpful web page from BestConverter that may help you decide what is likely to work for you: Magnetek/Parallax 6300/7300 Upgrade Kit
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Old 09-30-2014, 12:48 AM   #31
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Main reason I upgraded to AGM's. No water problems to deal with. Also upgraded to a 3 stage charger.
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Old 10-15-2014, 10:00 AM   #32
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OK, put in my 4 stage charger this past weekend....batteries have been on it charging for 48 hours....checked the output voltage from the converter...started off originally at 14.79v...now down to 13.2v if I recall.....

I took the batteries out of the coach - tested them with my meter...one was at 13.0, one at 13.02 volts, but that was just after disconnecting...I am going to let them sit for a few hours then recheck them...then have them load tested up the road....

I really figured that if these batteries did not have bad cells, that 2 days of charging on the new converter (I use 15amp extension cord to the trailer from my house) that it would charged up much higher volts?
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Old 10-15-2014, 10:25 AM   #33
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A good 12 volt battery with 100% charge should read about 12.7 VDC. Initial reading after charging may be higher, as in your case. Read the voltage 1-2 hours after removal of charge.

There's an excellent State of Charge chart floating around the forum somewhere.
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Old 10-15-2014, 10:42 AM   #34
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A good 12 volt battery with 100% charge should read about 12.7 VDC. Initial reading after charging may be higher, as in your case. Read the voltage 1-2 hours after removal of charge.

There's an excellent State of Charge chart floating around the forum somewhere.

Actually, some batteries read at 12.8-13.2,VDC when fully charged. For example, Lifelines at 12.7 VDC are considered 10% discharged. All depends on the specifications of the battery manufacturer.


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Old 10-15-2014, 12:40 PM   #35
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Now reads 12.95 and 12.97




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Old 10-15-2014, 12:41 PM   #36
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I hope this men's they are A-OK


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Old 10-15-2014, 01:49 PM   #37
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I hope this men's they are A-OK


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I would be comfortable with the batteries being 'ok'..
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Old 10-15-2014, 02:14 PM   #38
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I will have them tested at the advanced auto up the road as a final check as I already have them out just as a final check

Then I just cruise on

Can someone tell me what to expect with use in boondocking? How many amp hours do I have and is there a way I can just check the voltage like this at the battery and have a more accurate sense of how much charge I have left?


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Old 10-15-2014, 02:54 PM   #39
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If you had an amp probe or just a simple amp meter in series with a battery you can put a load on it and measure the voltage of the battery. When it gets below say 11V I would say it is done. Find a known constant load like a a fan motor etc and just let it run till the battery is dead. You can calculate the amp hours by multiplying the load amp by the time in hours. 2 A for 24 hrs is 48 AHr. The problem is figuring out when the voltage drops below 11V. If I were doing this at work I would use a data logger of some sort to measure all this and graph it and record the data to a file. You will find some load curves of batteries online. The more current you draw, the less amp hours you will get from a battery. You can make your own standard test and do it about once a year to see if your batteries are up to snuff. It is not something I would do often since deep cycling the batteries uses them up.

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Old 10-15-2014, 02:58 PM   #40
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Old 10-15-2014, 02:59 PM   #41
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You should be able to download a spec sheet for your battery from the manufacturer...

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Old 10-15-2014, 03:11 PM   #42
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GOOD BATTERIES!!

But you don't know the whole story..

One way to 'check' your systems... but not the only one... based upon your ticket above, you have over 500 AMPs...here is yet another link to 'convert' watts/amps/volts... How to Convert Watts to Amps Simplified -- Converting Amps to Watts the easy way

So, using 500 AMPS x 12Volts = 6000 watts.

If you put an 'ammeter' in the circuit, you can read the loads easier.. but, doing the 'test at load' as mentioned below will give you a 'ballpark' of your capability and longevity on the batteries and YOUR system.

Before you head out... for a "test".. start up all the 12V goodies... check voltage when all 'load' is on the batteries... run for an hour... check voltage.... repeat for 6 hours. Compare the voltages at each hour.. When you go 'boon docking', check voltages every couple of hours.. I bet you will find the voltages hold up pretty well...unless you are running extra loads like the heater.
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