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Old 12-12-2020, 08:38 PM   #6
JamieGeek
Axis/Vegas Enthusiast
 
Brand: Thor Motor Coach
Model: Axis 24.4
State: Michigan
Posts: 9,837
THOR #1150
Quote:
Originally Posted by The_Breeze View Post
Thanks for the replies. I don’t know if this helps anyone else so just throwing it out here. No one has to read it if they don’t want to 

I believe I have a solution and, like OldWeb suggested, the original xfr switch and converter/charger will be removed from the system and set aside for future consideration. I may remove it completely if the space proves useful for something else.

I have a question into AIMs. We’ll see if they answer. I don’t have a copy of that message because it’s all online and I forgot to capture a copy. I’ll replicate it best I can below.

The clincher in this setup was the 30A receptacle doesn’t exist yet. and I’d planned to install that in the electrical bay. If the invert is throwing 120 at the receptacle, I don’t know the inverter has the logic to say ‘I’m outputting that juice, so it’s not really coming from a power pole’. I believe it will interpret that 120 as shore power and say ‘hey, the batteries are getting low, let’s charge them’. The problem here is the batteries are supplying the 120 so the inverter draws on the batteries to charge the batteries – aka death loop or death spiral – and the batteries are toast in no time flat.


Possible solution:
The inverter has a Charger Input Circuit Breaker. The current solution out there for whole-house power is to throw the existing charger circuit breaker, effectively removing it from the system. Most don’t fool with the transfer switch. No need.

I believe I can simulate that behavior with the Charger Input Circuit Breaker and the steps in this process would be:

Inverter power:
1) open the Charger Input Circuit Breaker
2) plug the SP cord into the electrical bay receptacle
3) turn inverter on

Shore power:
Reverse the process with one extra step
1) turn inverter completely off
2) close the Charger Input Circuit Breaker
3) plug the SP cord into the power pole
4) turn the inverter on

In the shore power scenario, I don’t want the initial connection power pole surge to harm the inverter, though don’t know that turning it on manually will help much. I certainly don’t think it could be any worse but I’ve been wrong before.

In the inverter power scenario, I will have already disconnected from SP in some facility and rolled the cord up into the electrical bay.

Like I wrote, this may help someone else too so shoot holes in it if there’s the opportunity. I’d rather it turn into a piece of swiss cheese than cause someone heartache and expense (me included).
I'm pretty sure you are over thinking it.

If the inverter has a charger and a transfer switch built into it all that logic of "where is the 120V coming from" is already built in. You simply need to wire it up as the instructions say. No need for that extra 30a plug.

I'm guessing the instructions will say take the output of the transfer switch you already have (the one that sources 120V from either the generator or "shore power") and wire that into the inverter. Then wire the output of the inverter to your breaker panel. (Also wire the inverter to the 12V batteries.)

At that point you can turn off/remove the 12V converter since the inverter will do that.
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