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Old 04-10-2015, 08:49 PM   #29
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In addition, it is my understanding that the Parallax is not a steady "clean" 12V output and needs the batts to act as a electrical "stabilizer" or "sink" (pardon my current brain fart on the proper term) and shouldn't be powering the 12V system alone....unlike a more quality converter.
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Old 04-11-2015, 07:11 AM   #30
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Originally Posted by dznf0g View Post
Lew, I don't want it re-wired. I think there are different definitions of "store". Store to me means "batts installed, unit in storage with no 120V power, and as little parasitic drain as possible".

If I have 120V power available (as I will soon as my pad is poured at home) I would just unplug the converter from the wall to "isolate" the batts and 12V system from the converter.
I'm with you!!!!

I have installed a bunch of total battery disconnect switches that interrupt the main DC line from the batteries to the bus bar........ operates just like yours!!!!! When the switch is off......the coach is shut down!!!

I have no idea why anything other than the Classic has the electronic/solenoid version that still has parasitic loads connected directly to the bus bar and only isolates the battery from the bus bar??

Yours is better!!
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Old 04-11-2015, 07:36 AM   #31
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Agree, Lew, I have never understood that electric switch fiasco...other than the desire to have it on the wall rather than down low at the electrical center. But I use it...maybe 3 or 4 times a year...so.....
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Old 04-11-2015, 09:18 AM   #32
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Originally Posted by StillRod View Post
I say flaky because, in comparison to our 2012 19 footer, the battery use curve turns south dramatically faster. Whereas we consistently went three nights boondocking, we are lucky to get through two nights in the 25 with seemingly similar usage of lights, water pump, fans, etc.

It makes me wonder about greater ambient loads from the charger fan, the thermistor controlled reefer fan, and the inverter on the one hand and about the charger's workings on the other.

The batteries themselves were brand new as the trailer had been built only three weeks before we took delivery. Maybe we cooked them, which I accept as possible, but I hope not. Our intent is to keep this trailer a good while, and upgrade where appropriate...perhaps starting with the Parallax?
I noticed the same thing between my 2007 20' and the 2014 25'. The contributing things I've found are:

25' has a subwoofer that is always on if the radio in standby. Now I make sure the radio is fully off.

Inadvertently leaving the TV antenna booster on.

No off switch for the refrigerator fan.

Not sure but I think the water pump with its soft start uses more juice too.
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Old 04-11-2015, 01:25 PM   #33
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My 2009 FC 25' FB has a mechanical battery disconnect switch on the battery box. As a number of posters seem to have newer trailers without a mechanical disconnect switch, was this mechanical battery disconnect switch an option??

My trailer does have the Parallax 8355 converter. Since getting the trailer end of Feb we have had it plugged into shore power with batteries connected in. Today, electrolyte levels appeared normal and there was no evidence of boiling or venting. Voltage, batteries disconnected, was 13.02 volts and, connected to converter, 13.63 volts.

According to the date code, these batteries were new August, 2013. We know battery voltage was near zero when we picked the trailer up, so we are not expecting them to have a long life.

Adviseable to replace converter and batteries at same time??
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Old 04-11-2015, 01:37 PM   #34
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Adviseable to replace converter and batteries at same time??
When you find that your batteries need replacing, it would be a good idea to do the converter/charger too.

If your batteries were near zero charge when you picked the rig up and so far it has worked for you, that is the batteries, you may have lucked out and they did not sulphate or become too damaged. That is pretty rare though. If you boondock and find the battery capacity poor, you will know it is time to replace them.
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Old 04-11-2015, 04:41 PM   #35
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Originally Posted by Burnside Bob View Post
My 2009 FC 25' FB has a mechanical battery disconnect switch on the battery box. As a number of posters seem to have newer trailers without a mechanical disconnect switch, was this mechanical battery disconnect switch an option??

My trailer does have the Parallax 8355 converter. Since getting the trailer end of Feb we have had it plugged into shore power with batteries connected in. Today, electrolyte levels appeared normal and there was no evidence of boiling or venting. Voltage, batteries disconnected, was 13.02 volts and, connected to converter, 13.63 volts.

According to the date code, these batteries were new August, 2013. We know battery voltage was near zero when we picked the trailer up, so we are not expecting them to have a long life.

Adviseable to replace converter and batteries at same time??
The mechanical disconnect was not an option, and some consider the electric store switch an improvement. Based on what I have read here, I don't, and am glad I have an old fashioned mechanical store switch.
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Old 04-12-2015, 09:10 AM   #36
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Good discussion. I've gleaned several Take Aways thus far:
- upgrade to a multistage charger
- tend batteries more vigilantly than I otherwise have
-- consider AGM batteries for their higher capacity and better behavior
- rewire battery disconnect, placing it further upstream to eliminate parasitic drains
- go back to college to study electrical engineering

Do I have that about right?
Any recommendations for a specific brand or model of charger?

Thanks,

Rod
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Old 04-12-2015, 10:30 AM   #37
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Junk that thing and get a Progressive Dynamics converter. The Parallax unit cooks batteries. Ask me how I know.
I followed all the threads and got a Progressive Dynamics replacement. I have to say the installation was pretty easy and no adjustments had to be made to the circuit breaker panel or other items.
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Old 04-12-2015, 10:41 AM   #38
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Cool

Quote:
Originally Posted by StillRod View Post
Good discussion. I've gleaned several Take Aways thus far:
- upgrade to a multistage charger
- tend batteries more vigilantly than I otherwise have
-- consider AGM batteries for their higher capacity and better behavior
- rewire battery disconnect, placing it further upstream to eliminate parasitic drains
- go back to college to study electrical engineering

Do I have that about right?
Any recommendations for a specific brand or model of charger?

Thanks,

Rod
You get an A for thread reading skills. The degree in EE will unfortunately not earn you practical skills, mainly theory on which to base them. Finding the practical side is the most difficult part of electrical things.

The Progressive Dynamics line of independent converter/chargers (92xx series) and their line of built in charger replacement units (46xx) is a good one. There are several others.
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Old 04-12-2015, 02:30 PM   #39
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In case you have not seen it, Randy at Bestconverter.com is the place to go for this kind of question and equipment. Even better, he is in your neck of the woods.

Larry
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Old 04-12-2015, 03:00 PM   #40
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One of the first things I did on our New 2012 25FB was replace the incorrectly engineered change over switch (small relay) that left us with out any power the first two outings till I realized how badly underrated the factory change over switch was.

While I had things torn apart I replaced the bottom of the line converter with a new Iota DLS55MW/IQ4. A very good and easy upgrade.

The black box on the top right was the new 30A change over switch "contactor" assembly. The Iota I mounted on the wall on the left. I don't think I ever heard the fan come on.

I plan on upgrading our new 2015 Bunk in the next month or so. Currently I keep the batteries disconnected in storage and use a battery minder to keep them in good shape.
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Old 04-12-2015, 08:22 PM   #41
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Originally Posted by 2012FB View Post
One of the first things I did on our New 2012 25FB was replace the incorrectly engineered change over switch (small relay) that left us with out any power the first two outings till I realized how badly underrated the factory change over switch was.

While I had things torn apart I replaced the bottom of the line converter with a new Iota DLS55MW/IQ4. A very good and easy upgrade.

The black box on the top right was the new 30A change over switch "contactor" assembly. The Iota I mounted on the wall on the left. I don't think I ever heard the fan come on.

I plan on upgrading our new 2015 Bunk in the next month or so. Currently I keep the batteries disconnected in storage and use a battery minder to keep them in good shape.
Nice Work!

BTW, that black box is 'officially' called an Automatic Transfer Switch
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