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Old 12-12-2011, 06:11 PM   #1
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Inverter integration

I've been using a portable inverter for our computers and such but it wasn't a very slick solution. The challenge was how to integrate an inverter with my existing shore power/converter infrastructure.

After some research I decided to go with a Xantrex ProWatt 600 with remote switch and Xantrex inline transfer relay. This setup would allow me to keep both systems in parallel without having to manually switch the power source. The transfer relay automatically switches to shore power in the event my inverter is on.

The only unforeseen issue is the breaker for the converter/charger must be off or the inverter will try and charge the battery through the converter. Not a big deal, I never use shore power and it's a small inconvenience if I do.


Wiring schematic



Purchased components. Xantrex ProWatt 600, Xantrex inline transfer relay, 80amp ANL fuse, 4awg wire. Approximately $250.



Where to put it, here's a free spot.



Installed and secured to couch frame.



Remote switch integrates nicely with SMB panel.
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Old 12-13-2011, 02:43 PM   #2
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Re: Inverter integration

I've never used an inverter, so maybe there's something I don't understand why would a transfer switch reduce the number of switches that have to be operated?

With the transfer switch installed, the 12v converter circuit breaker has to be operated when connecting to shore power.

Without the transfer switch, the inverter has to be switched off when connecting to shore power.

Am I missing something?
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Old 12-13-2011, 03:39 PM   #3
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Re: Inverter integration

The transfer relay is automatic, nothing to switch. The reason I need a transfer relay ( in this case automatic ) is because AC power sources must never be connected together. If you have more than one source for AC current it must go through a transfer relay, which is a device that keeps the different incoming AC power sources separated. The relay should be located before the AC distribution panel hence why I have to turn off the converter/charger breaker while using the inverter.

SMB optionally installs a single unit that handles all of this (converter/inverter/charger/transfer relay). I didn't get that option because it was expensive and overkill for my electrical needs.

The distribution panel in your SMB has 2 sides. The left side is 110v AC, the right side is 12v DC. In my setup the shore power is connected to the top breaker, the 2nd breaker is the converter/charger, the 3rd breaker is for the 110v power outlets. Normally shore power connects to the top breaker which is now connected to the output of the transfer relay. The shore power in my SMB is now one of the inputs to the transfer relay. I think I confused myself now....

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Old 12-13-2011, 04:25 PM   #4
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Re: Inverter integration

Transfer switch also keeps the AC inlet from being 'hot' when the inverter is on. Could save a kids life.

Transfer switch is legally required for a home generator to keep from powering 'dead' power lines caused by falling trees etc. and is needed to keep the linemen alive.

A really good idea, and one I hadn't thought of.

Good job!

Mike
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Old 12-14-2011, 11:12 AM   #5
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Re: Inverter integration

Quote:
Originally Posted by Ford_6L_E350
Transfer switch also keeps the AC inlet from being 'hot' when the inverter is on. Could save a kids life....
Good point.
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