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Old 08-29-2012, 10:47 PM   #1
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Should I unhook batteries from shore power?

Ok dumb question I am sure, but when you are plugged in to shore power for extended periods should I unhook the batteries or at least from the charging? Just thought about it the other day and was wondering if it was hard in the batteries to be charging all the time.

Matt
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Old 08-29-2012, 11:02 PM   #2
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With a simple one stage charger, that would not be a bad idea. With the modern 3 stage chargers available it is unnecessary. If you have an original simple Univolt it is time to replace it anyway. Something like a Progressive Dynamics PD 9245 or 9260 would bring you up to date.
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Old 08-30-2012, 10:37 AM   #3
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So can you explain to me how I know if I need 45amp or 60amp? I understand voltage stuff better but this combining of volts and amps is new to me.
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Old 08-30-2012, 11:00 AM   #4
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It has to do with the rate at which the converter will recharge batteries and the capacity it has to handle 12v use without using power from the batteries while connected to shore power.

For a larger trailer with lots of lights, I would lean towards the 60 vs the 45. Even with all the lights on, it would still recharge the batteries quickly.

I also like the Progressive Dynamics PD 9260. I have PD converters in both of mine.
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Old 08-30-2012, 12:00 PM   #5
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Thanks Vaughn,

Wasn't sure what all that meant really. Well it is a 34ft trailer so with all those lights and open space I should probably go with the 60!
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Old 08-30-2012, 12:22 PM   #6
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I remember Andy Rogozinski posting something to the effect that the Univolt systems didn't balance properly if the coach battery was out of the circuity. Leaving one of those constantly plugged in requires regular checking of electrolyte levels.

A modern voltage converter certainly will do an excellent job of protecting your battery.
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Old 08-30-2012, 12:27 PM   #7
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Originally Posted by flyfishrra
Thanks Vaughn,

Wasn't sure what all that meant really. Well it is a 34ft trailer so with all those lights and open space I should probably go with the 60!
I just replaced the buzzy-volt in our 31' 76 with a PD9260. It was fairly simple and quick.

We purchased ours from http://www.adventurerv.net/
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Old 08-30-2012, 12:49 PM   #8
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Ok I haven't looked down there yet but two batteries equals one 9260 or one does both batteries? Dumb question I know but I am at work and can't go look! Stupid work getting in the way of trailer stuff!
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Old 08-30-2012, 01:05 PM   #9
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One converter charges both batteries at the same time with a stock 2-battery system.
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Old 08-30-2012, 01:15 PM   #10
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Thanks Vaughn,

Wasn't sure what all that meant really. Well it is a 34ft trailer so with all those lights and open space I should probably go with the 60!
That would be my recommendation.

If you want to see photos of an install, check out http://www.airforums.com/forums/f449...0-a-57567.html. I went way overboard with a 9280, which required an adapter to even plug it in. It certaianly doesn't sweat the load, the fan almost never comes on. I think the 9260 would have been more than enough.

The first few posts in the thread are good for you. After that, it took some strange turns (as threads here on the forums often do) into unrelated issues in a motorhome.
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Old 08-30-2012, 02:07 PM   #11
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Originally Posted by flyfishrra View Post
Thanks Vaughn,

Wasn't sure what all that meant really. Well it is a 34ft trailer so with all those lights and open space I should probably go with the 60!
I really don't know all that much about converters and amps and all that stuff but let me give this a try. I am with you when it comes to confusion about such stuff. Since I am also a fly fisherman, I think I should step up and help you a bit.

When you plug into shore power the 110 goes directly to your 110 outlets in the coach and to your converter. The converter "converts" this to 12 V DC which powers all your lights, water pump and fridge electronics. It also starts charging your battery or batteries if you have more than one.

The old converters had a 1 stage battery charger built in which means that it simply started charging batteries at a set level. If left unattended, these would over charge batteries in short order and "fry" them. The newer units have 3 stage chargers that sense when the batteries are nearing complete charge and step down the rate of charge accordingly.

Now, as far as the amp ratings issue, this is what I understand. The more amps the converter has will allow it to run more 12 V appliances at once AND still have power to charge the batteries. I don't have a clue as to what is needed so when I replaced mine, I listened to the tech guy. I have an IOTA converter with 55 amp rating and a three stage charger. It is rather sweet and I don't worry about my batteries when I am hooked up. The PO left the trailer plugged in 24/7 and the batteries were toast. When he took it out he always plugged it in at his destination. When I opened the battery compartment, it was an ugly sight.

I hoped I have not insulted you with this and that at least some of what I have said was useful. I am sure we will hear from others if I have said anything in error.
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Old 08-30-2012, 02:22 PM   #12
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I've also decided to replace my Parallax with an Iota and the IQ4 module. As a fulltimer, I'm always plugged in. As a result, I recently found one of my batteries dry. I had an indication that the batteries might not be healthy after a 3 hour power outage. Of course I had the fantastic fans running front and rear. When the power came back up, the fans noticebly increased in speed, telling me all was not well. My batteries were installed in 2006 by a PO, so we've gotten our collective monies worth.

By the way, both batteries look to be in excellent shape physically, no corroded terminals, etc.
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Old 08-30-2012, 02:59 PM   #13
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Thanks Everyone! Not offended at all guys. The more information I can get the better. I have helped build houses and lots of other stuff. Not new to most of it but some of this is new to me so just trying to understand from those that have dealt with it! Ordering a new 9260 today! Batteries are brand new and I would like to keep them that way! Also hate the stupid 24/7 buzzing!
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Old 08-30-2012, 04:02 PM   #14
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You'll love it. The PD I installed is dead quiet even when the fan runs.
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