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Old 08-26-2020, 03:16 PM   #1
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Inverter/Charger

2007 Alpine Coach 36mdds se limited
Original Xantrex RS2000 inverter/charger; panel voltage reads .5 volts below actual multi-meter reading! Looking for a work around or what is the best/easiest to do replacement unit? Just installed 8 new Flooded batteries.
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Old 08-26-2020, 03:20 PM   #2
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Is just the remote panel reading off are is charging voltage off by 1/2 volt?
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Old 08-26-2020, 03:31 PM   #3
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Recommend you get a Victron SmartShunt as the first thing. They are less than $150 and will give you much better visibility on your batteries and shows right up on your smartphone

Then you can see much more clearly what's being put out and where the batteries are so you can see what's really going on with your Charger.....even if it needs to be replaced that battery monitor is a huge help.

If it needs replacement you can add either a Victron 12/3000 Multiplus or a Magnum 3012......both of these are hybrid inverters and will give you infinitely more options not to mention being a pure sine wave unit
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Old 08-26-2020, 03:32 PM   #4
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I would get one more meter to confirm if one is off by 1/2 of a volt.
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Old 08-26-2020, 03:59 PM   #5
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The charging voltage is also off by the same .5 volts, and I verified with another meter! I will check out the Victron thanks.
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Old 08-26-2020, 04:28 PM   #6
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Quote:
Originally Posted by Schuby View Post
The charging voltage is also off by the same .5 volts, and I verified with another meter! I will check out the Victron thanks.
I recommend you check the charging voltage at both the output (inverter) and at the batteries. Those cables were at best a bit undersized at 2/0 (I replaced all mine with 4/0) and your .5V could very easily be due to cable loss.

I would measure output at the inverter lugs as well as at the batteries themselves........lots of opportunity for cables/lugs to have developed additional resistance after all these years
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Old 08-26-2020, 05:04 PM   #7
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The output at the inverter and in the battery compartment read the higher +.5 voltage and the cables coming off the inverter are 4/0.
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Old 08-26-2020, 05:11 PM   #8
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Try unplugging shore power, turning off inverter and disconnecting the large-gauge 12 VDC cables to the inverter.


It MAY reset the inverter. Nothing to loose by trying.
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Old 08-26-2020, 05:11 PM   #9
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Quote:
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The output at the inverter and in the battery compartment read the higher +.5 voltage and the cables coming off the inverter are 4/0.
So is the actual charging voltage to the batteries correct but the reading at the control panel reading .5V low??

Sorry I am a bit confused.
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Old 08-26-2020, 05:30 PM   #10
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I will try disconnecting the cable but the coach has been powerless for 3 days; no batteries in it and unplug! It was doing the same thing before I changed the batteries but I thought it was the bad batteries!

Paul, if the panel calls for a float charge of 13.5 volts the charger sends out 14.0 volts to the batteries!
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Old 08-26-2020, 05:41 PM   #11
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Quote:
Originally Posted by Schuby View Post
I will try disconnecting the cable but the coach has been powerless for 3 days; no batteries in it and unplug! It was doing the same thing before I changed the batteries but I thought it was the bad batteries!

Paul, if the panel calls for a float charge of 13.5 volts the charger sends out 14.0 volts to the batteries!
Yeah that's a big deal. Good idea to disconnect cable at both inverter and at the control panel.....might even be a good idea to use some contact cleaner on those connections as well.

That being said, it probably will still be off and could be time to replace the inverter
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Old 08-26-2020, 06:34 PM   #12
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Quote:
Originally Posted by Schuby View Post
I will try disconnecting the cable but the coach has been powerless for 3 days; no batteries in it and unplug! It was doing the same thing before I changed the batteries but I thought it was the bad batteries!

Paul, if the panel calls for a float charge of 13.5 volts the charger sends out 14.0 volts to the batteries!
The panel doesn't call for voltage, it monitors it.

If you are saying the float is set for 13.5 and its outputting 14 volts, that's different.

That's probably a bad battery temp sensor. Unplug it and see if it drops down to 13.5.

The battery temp sensor adjusts the voltage depending on battery temps. Cold batteries need more float voltage then hot ones.
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Old 08-26-2020, 07:01 PM   #13
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Yes I'm saying the float is set for 13.5 and it's outputting 14 volts; if I unplug the temp sensor both the float and the output drop by 1 or 2 volts. I just went out and hit the red reset on the box and now there is no shore power showing up. Turned everything off and unplugged the shore power, tomorrow's another day!
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Old 08-27-2020, 07:00 AM   #14
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Must have been a long day yesterday! I had turned off the breakers for the inverter! Power all working again, but still the .5 discrepancy in voltage readings.
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