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Old 05-03-2020, 06:08 PM   #1
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Brand: Thor Motor Coach
Model: Challenger 37LX
State: Florida
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THOR #6310
Bypass Mode Failure - Prosine 1800 Inverter

The bypass mode on our Xantrex Prosine 1800 stopped operating. There’s 110V on the AC input, and the unit it does still convert DC to AC, it just doesn’t connect the 110V in bypass mode. Has anyone seen this condition? If so, what’s the remedy?

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Old 05-03-2020, 07:15 PM   #2
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Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
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THOR #12751
Bypass Mode Failure - Prosine 1800 Inverter

There is a built-in transfer switch in several of the Xantrex Inverters.

When you are plugged into shore power, the transfer switch should allow the AC to pass through the the Inverter and directly to the outlets powered by the inverter automatically.

When AC power is removed from the input to the inverter, it should automatically switch to the batteries to supply the AC power to the outlets powered by the inverter IF the inverter is powered on.

Sounds to me like there is an issue with the transfer switch portion of the inverter if AC is not passing through when you are on shore power.

Not sure if they use a physical relay or an electronic rely on a circuit board for the transfer switch but my guess is the problem is in that part of the inverter.
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Old 05-05-2020, 01:09 AM   #3
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THOR #6310
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Originally Posted by Judge View Post
There is a built-in transfer switch in several of the Xantrex Inverters.

When you are plugged into shore power, the transfer switch should allow the AC to pass through the the Inverter and directly to the outlets powered by the inverter automatically.

When AC power is removed from the input to the inverter, it should automatically switch to the batteries to supply the AC power to the outlets powered by the inverter IF the inverter is powered on.

Sounds to me like there is an issue with the transfer switch portion of the inverter if AC is not passing through when you are on shore power.

Not sure if they use a physical relay or an electronic rely on a circuit board for the transfer switch but my guess is the problem is in that part of the inverter.

We're assuming it's the transfer switch in the inverter. We tried disconnecting all power to it, twice, in an effort to "reboot", as directed by Xantrex. That didn't work. Xantrex says transfer switch within the unit is bad. Only resolution is to replace the unit, ($1,200...OUCH) or, we can add a separate transfer switch. Has anyone done this? We're looking at adding this one. Any other ideas or thoughts?
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 05-05-2020, 02:06 AM   #4
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Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 3,322
THOR #12751
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Originally Posted by BradnKaren View Post
We're assuming it's the transfer switch in the inverter. We tried disconnecting all power to it, twice, in an effort to "reboot", as directed by Xantrex. That didn't work. Xantrex says transfer switch within the unit is bad. Only resolution is to replace the unit, ($1,200...OUCH) or, we can add a separate transfer switch. Has anyone done this? We're looking at adding this one. Any other ideas or thoughts?
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

You are going to need to do some rewiring to use it.

First, you would need to pull the cable supplying the AC input to your Inverter out of the Inverter and use it with a junction box so you could connect it to the Utility Input wires of the external transfer switch.

Then, you would need to plug the external transfer switch into the outlet on the Inverter.... assuming it came with the optional outlet. If not, you would need to add one to your Inverter.

You would then need to pull the cable from the output of your inverter and use it with another junction box to connect it to the Load / AC Output wires of the external transfer switch.

You would keep your Inverter powered on all the time and then when you removed shore or generator power, the transfer switch would allow the AC output of the Inverter to go to the outlets wired to the Inverter.
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