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Old 04-29-2013, 11:09 AM   #1
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Unique Electrical Issue

We have a 2011 Berkshire on a 2009 chassis (no DEF required) and I have a unique situation with my electrical system. When I am plugged into shore power of 50 amps I still have a 9 amp draw even with both the house and chassis batteries shut off. I can hear a humming noise from above the battery banks when I'm plugged into shore power and with all shut offs in the off position. I didn't notice the issue prior to the inverter being changed. That doesn't mean that I think it may be the new inverter, only that I didn't notice the issue before this.

Does anyone have any suggestions on where to look? My first thought was my block heater may be the issue, but I still have the draw with the block heater unplugged. Now I'm just scratching my head.
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Old 04-29-2013, 11:16 AM   #2
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Disconnect the new inverter?????
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Old 04-29-2013, 12:33 PM   #3
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Disconnect the new inverter?????
That may not help him, as I THINK all the 12 volt power (even from the batteries) goes through the inverter. If I'm wrong on this someone will "slap me down"

IF that is the case, then the draw could be coming from anywhere; although he did say it happens with all the master switches turned off

My GUESS would be that the chap that changed out the inverter wired it incorrectly. But then I always tend to blame the tech......

Boowho??
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Old 04-29-2013, 12:50 PM   #4
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Originally Posted by wnytaxman View Post
We have a 2011 Berkshire on a 2009 chassis (no DEF required) and I have a unique situation with my electrical system. When I am plugged into shore power of 50 amps I still have a 9 amp draw even with both the house and chassis batteries shut off. I can hear a humming noise from above the battery banks when I'm plugged into shore power and with all shut offs in the off position. I didn't notice the issue prior to the inverter being changed. That doesn't mean that I think it may be the new inverter, only that I didn't notice the issue before this.

Does anyone have any suggestions on where to look? My first thought was my block heater may be the issue, but I still have the draw with the block heater unplugged. Now I'm just scratching my head.
Is the Inverter Running? Mine charges the batteries when plugged in, even with the disconnect off to the rest of the 12 volt system of interior lights etc. Your steps into the coach and LP detector usually are not off when the 12 volt switch is in the off position either.
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Old 04-29-2013, 12:53 PM   #5
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Quote:
Originally Posted by wnytaxman View Post
We have a 2011 Berkshire on a 2009 chassis (no DEF required) and I have a unique situation with my electrical system. When I am plugged into shore power of 50 amps I still have a 9 amp draw even with both the house and chassis batteries shut off. I can hear a humming noise from above the battery banks when I'm plugged into shore power and with all shut offs in the off position. I didn't notice the issue prior to the inverter being changed. That doesn't mean that I think it may be the new inverter, only that I didn't notice the issue before this.

Does anyone have any suggestions on where to look? My first thought was my block heater may be the issue, but I still have the draw with the block heater unplugged. Now I'm just scratching my head.
wnytaxman, just to make sure I am understanding correct.......are you having a 9 amp DC draw or a 9 amp AC draw?

The reason I am confused, as you are talking about inverters, which convert DC (battery) power into AC power.

You are also talking about being plugged into AC 50 amp shore power, but with your batteries (DC) being shut off.

There's no chance you are referring to a converter (AC to DC) instead of an inverter (DC to AC)
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Old 04-29-2013, 01:00 PM   #6
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I would try to isolate that "humming" noise.

Use a paper "cone" and an ear plug in your opposite ear to try and isolate it.
9 Amps of anything is a lot of power.
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Old 04-29-2013, 01:04 PM   #7
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Water heater amps in reference is 10 - 11 amps!
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Old 04-29-2013, 01:29 PM   #8
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Water heater amps in reference is 10 - 11 amps!
True, but I can't believe it is powered off the inverter.
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Old 04-29-2013, 01:29 PM   #9
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Is it the LP detecor solenoid on the Propane tank?? its always on.
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Old 04-29-2013, 02:52 PM   #10
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I thought about the Propane detectors and the fire alarms, but the draw is pretty high for that. I use a Progressive Surge Protector and when I plug the coach into the Surge Protector, it reads 9 amps as being drawn. I would assume that is AC.

The way this came to the forefront is that where I have inside storage we also have a 50 amp hookup. I usually would leave the unit plugged in during winter storage just as a convenience for winter starting. My landlord called one day questioning his electric bill and telling me that it appeared to be my coach which was causing the problem. Sure enough, it was mine that was continuing to have a fairly substantial electrical draw even though the house, chassis, and interior shut offs were all in the off mode.

I'm not mechanically or electrically inclined, so if I sound dumb on something, it's because I am! I'm trying to isolate what the problem may be or where it may be before I take the plunge of letting the techs at it.

Ed
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