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Old 04-29-2013, 03:07 PM   #11
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your progressive surge protector is reading AC draw from the shore power outlet.

from shore power to your coach, it hits the automatic transfer switch (silver/gray box) first then into the coach's sub panel's main breakers. all the outlets including the one next to the inverter connect back to the sub panel (under the bed).

the inverter has an automatic transfer switch inside of it as well to switch from battery to shore power for the outlets it powers (mainly the entertainment media outlets).

the inverter also has a converter on it to charge the batteries. chances are what you are hearing is the fan from the converter as it's charging your batteries because it has shore power. this converter/charger also charges the chassis batteries.


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Old 04-29-2013, 03:15 PM   #12
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Here are some charts/schematics of how the electrical may work in your coach. You could have an inverter/charger as Himcules pointed out, although some coaches have a separate converter and inverter. I am posting both charts for information purposes, and someone else may read it in the future.




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Old 04-29-2013, 03:22 PM   #13
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wnytaxman, what make and model is your inverter?

if you have a multi-meter, you can test on your batteries to see if you are getting a a reading of 13.5v or so, which means your batteris are being charged...
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Old 04-29-2013, 03:30 PM   #14
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I'm going to try to get down to the storage facility tonight to answer your questions. As I said, this is something totally out of my league so let me see what I can find out and then answer your questions.

ed
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Old 04-29-2013, 03:35 PM   #15
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Ed,
Not sure about the electrical draw but could it be that the transfer switch is where the hum is coming from? Also, I don't know if the transfer switch draws any power when it is working. Maybe someone here knows if it does.

Also, could the switch to use electric for the water heater be on?
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Old 04-29-2013, 03:38 PM   #16
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Quote:
Originally Posted by wnytaxman View Post
I'm going to try to get down to the storage facility tonight to answer your questions. As I said, this is something totally out of my league so let me see what I can find out and then answer your questions.

ed

as you can see from my pictures, i still have the stock magnum 1200 watt inverter. mine makes noise as well when i am on shore power with nothing running. if your inverter was replaced with a stock unit, then it's probably the same make and model. unless you had a completely different type installed...

i do plan to rewire the coach to have all outlets inverted with a much larger inverter (long time from now when i get to dry camp a lot more). right now, it stays stock until it breaks and out of warranty.
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Old 04-30-2013, 04:11 PM   #17
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So here is where we are at the moment. FR suggested the problem may have been that the inverter was on, which would have a draw on the shore power. I checked and the inverter was not on. So far we have eliminated the block heater being on and the inverter being on.

My transfer switch is a Progressive Dynamics PD52 and I have a Magnum inverter. I don't know if that information helps, but that's what's in the bay. BTW Himcules, my power set up is much different than yours. My power cord is in a bay which contains only the power cord and teh transfer switch.

Here is the sequence of events that occur when I plug into shore power. It shows no draw on either line 1 or 2 for about 30 seconds. Then I get an immediate draw of 10 amps. After that first burst, the draw will be from 7-10 amps.

I don't know if that info helps, but that's where I'm at.

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Old 04-30-2013, 04:33 PM   #18
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well.. the inverter doesn't have to be on for the converter/charger portion of it to work and charge the batteries.

there is a breaker on the magnum inverter. i do not know if that cuts off everything on the inverter or just the a/c power side of it. maybe try to set that breaker off and see if the noise and draw disappears. if it does, then you know for sure it's your magnum inverter trying to charge your batteries.
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Old 05-01-2013, 11:14 AM   #19
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We have a '13 360QL with an 8K Onan generator. Recently it is shutting down when batteries reach full charge. Onan said the Magnum inverter is 'back charging' the Onan inverter tripping the shut down. Onan replaced generator inverter during my visit. It's still occurring and Magnam said they haven't had any other problems like this. Xantrex inverters did previously, according to Onan techs, but modification was made to correct the issue. For now have to run load on house batteries to insure never gets fully charged if I want to use generator. FR is going to replace my inverter, but wanted to know if any other Berkshire owners have had this problem?
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Old 05-01-2013, 11:27 AM   #20
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We have a '13 360QL with an 8K Onan generator. Recently it is shutting down when batteries reach full charge. Onan said the Magnum inverter is 'back charging' the Onan inverter tripping the shut down. Onan replaced generator inverter during my visit. It's still occurring and Magnam said they haven't had any other problems like this. Xantrex inverters did previously, according to Onan techs, but modification was made to correct the issue. For now have to run load on house batteries to insure never gets fully charged if I want to use generator. FR is going to replace my inverter, but wanted to know if any other Berkshire owners have had this problem?
my 390bh did not come with a remote onan autostart module. only way for the generator to turn itself off is with the autostart module. perhaps there is something programmed in yours? do you happen to have the wireless onan autostart?

something doesn't sound right...

the generator does not directly charge the batteries. it uses the inverter to charge the batteries. generators are not hooked up like the vehicle's alternator where there is a direct charge. the generators produce AC power into the auto transfer switch which powers the house portion of the coach. the inverter is plugged into one of the house outlets and takes the AC power and charges the batteries and transfers its outlets over to AC as well. so the "back charging" is SUPPOSED to happen. the magnum inverter goes from bulk to float charge when the batteries are full. it does send the full signal back to the generator autostart module.
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