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Inverter problem I think? Xantrex SW3000
Original purchase in Jan 2019 and coach had a long period of sitting.  Before purchase owner put in 3 8D flooded coach batteries and 3 chassi batteries all new.  I'm sure in conversation with them that they let the batteries go dead several times...

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  • jcus
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Re: Inverter problem I think? Xantrex SW3000
Reply #1
Buy a IR temp gun and shoot all cables and connections. Loose or bad connections will produce heat and you will able to see the higher temps.
Milwaukee Laser Temperature Gun Infrared 10:1 Thermometer-2267-20 - The Home...

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Re: Inverter problem I think? Xantrex SW3000
Reply #2
Sounds like a bad charger and now the batteries are toast. Or maybe they just let them go. But...
If so, replace with a Victron multiplus inverter charger and new batteries.
I'm sure many will give you advice on the battery side. If you can afford...

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Re: Inverter problem I think? Xantrex SW3000
Reply #3
Sounds like a bad charger and now the batteries are toast. Or maybe they just let them go. But...
If so, replace with a Victron multiplus inverter charger and new batteries.
I'm sure many...


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Re: Inverter problem I think? Xantrex SW3000
Reply #4
Correct.  Battery voltage is/should be measured with BATTERIES AT REST.

If measured under a load, posted minimum voltage readings are MISLEADING.

Re: Inverter problem I think? Xantrex SW3000
Reply #5
Will try again tomorrow and post readings at rest as well.  Hope they are not toast!  Ordered the IR gun. 

Any other way to troubleshoot an inverter?

Re: Inverter problem I think? Xantrex SW3000
Reply #6
I would check your re settable settings.  You can download a manual from the Xantrex site or use the link I've attached.  I would set the low battery dc cutoff to 10 to 10.5 volts should you find it higher.  I believe this might eliminate your...

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Re: Inverter problem I think? Xantrex SW3000
Reply #7
Wondering if you have a bad isolator- sounds like it could be bleeding amps through a bad diode when you are not plugged in or running engine or generator.  This could take down both sets of batteries as they are connected and not separated (...

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Re: Inverter problem I think? Xantrex SW3000
Reply #8
I don't think the batteries were fully charged its been overcast for several days now, with the 200w solar plugged in, the charge at the solar controller was reading 13.1.  Did not unplug solar and ran microwave for 2m.  Realizing what I had done...

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Re: Inverter problem I think? Xantrex SW3000
Reply #9
THIS is a problem:

With microwave on heated water for 2m
inside panel 12.1
Battery 12.0
Fuse both sides 11.4
inverter 11.3
Why would voltage drop so much at the inverter and both sides of the fuse when it is under load?


You need to trace down where you...

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Re: Inverter problem I think? Xantrex SW3000
Reply #10
THIS is a problem:

With microwave on heated water for 2m
inside panel 12.1
Battery 12.0
Fuse both sides 11.4
inverter 11.3
Why would voltage drop so much at the inverter and both sides of the fuse...


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Re: Inverter problem I think? Xantrex SW3000
Reply #11
Tommy, I am glad you found out you had the incorrect low dc battery setting.  This is a common mistake people make when they change their inverter/charger settings. 

I believe you are correct, your batteries are not fully charged. Your water...

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Re: Inverter problem I think? Xantrex SW3000
Reply #12
Could the distance of the cables from the battery to the fuse and inverter cause the voltage loss?
Don't think its the distance, as the cable to fuse is 3' tops.  Its on the next compartment...

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Re: Inverter problem I think? Xantrex SW3000
Reply #13
Brett, I will check the connections and report back.

Re: Inverter problem I think? Xantrex SW3000
Reply #14
Thanks Jack, good article.

Re: Inverter problem I think? Xantrex SW3000
Reply #15
Could the distance of the cables from the battery to the fuse and inverter cause the voltage loss?

Not if properly sized wire.  What is length of wire run and what gauge? What wattage was the load?

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Re: Inverter problem I think? Xantrex SW3000
Reply #16
Not if properly sized wire.  What is length of wire run and what gauge? What wattage was the load?
3' to fuse, 3' to inverter.  4/0 guage looks like.  Microwave 850W

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Re: Inverter problem I think? Xantrex SW3000
Reply #17
Tommy, Since now we know you do not have an inverter problem (such good news), if you do not already have, I recommend to you to help moniter your batteries, an easy install, is to purchase a battery moniter, the Victron BMV 712 Smart that has a...

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Re: Inverter problem I think? Xantrex SW3000
Reply #18
Thanks Jack, I will look into the battery monitor.

Re did voltage to see if I did something wrong

No Load
inside panel 13.0
Battery 13.01
Fuse both sides 12.98
inverter 12.98

With microwave on heated water for 2m
inside panel 11.7
Battery 12.13
Fuse both...

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Re: Inverter problem I think? Xantrex SW3000
Reply #19
No, as long as you can tighten it up, rust on the bolt is not a problem.

Could you replace it-- sure. But, it is not causing a voltage drop if it is tight.

Re: Inverter problem I think? Xantrex SW3000
Reply #20
Jcus, Jim c. (Sorry I had cranemans name here before by mistake)
How much difference in temperature will there be with a loose or bad connection on a battery terminal. Does 1 degree, 2 or is it more like 10 degrees difference in temperature that...

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Re: Inverter problem I think? Xantrex SW3000
Reply #21
Voltage is a better gauge of bad connection. Voltage on one side of a connection should be the same as the other. I never used a IR temp. for connection problems use them for wheel, tire and bearing temps.

  • jcus
  • [*][*][*][*][*]
Re: Inverter problem I think? Xantrex SW3000
Reply #22
Jcus, Jim c. (Sorry I had cranemans name here before by mistake)
How much difference in temperature will there be with a loose or bad connection on a battery terminal. Does 1 degree, 2 or is it...


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Re: Inverter problem I think? Xantrex SW3000
Reply #23

Best done after, or during a heavy load. Any bad connection will cause resistance, which causes heat, thus he higher temps.
https://dam-assets.fluke.com/s3fs-public/2562804_6250_eng_a_w.pdf

Actually...

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  • jcus
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Re: Inverter problem I think? Xantrex SW3000
Reply #24
Actually ONLY done under high load.  At low load, even a bad connection is usually able to pass a few amps.  Think of a bad connection as a 10 gauge wire. vs 4/0 cable.  Small loads, no...


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