Transfer switch

I agree with Doug's earlier post.

We really need more information to assist you. Let's start with what appliances are on your RV-- are they designed for 120VAC/60HZ? That could be a problem right there if powered by 50HZ.


And, if your appliance are 50 HZ, unless you get a 50 HZ inverter, when on inverter power, you will be supplying them with 60 HZ, not 50 HZ.

Either you have NO clue as to what you are attempting to do and you will not answer my questions or you just want to waste people's time on this thread. Your diagram shows 220 and 120 coming IN. NO RV has such a input designed system. A QUALIFIED electrician should be able to answer and wire what you want to do, or will tell you it cannot be done correctly. Doug

Two ways one is a manual trnasfer switch the other automatic

First you "Split" your breaker panel into two boxes/panels one to be powered by the INVERTER the other by Shore/Generator. The "Main" panel has big loads like Air Conditioners, Water heater, Fridge, and depending on the size of the inverter the mirowave.

THe SUB panel has outlets (THe GFCI protected ones) Televisons, radios and optionally the MIcrowave.. I would suggest if you have an RV type Fridge (Absorption cooling) it remain on the MAIN. as does your Converter.

30 amp breaker to 30 amp manual transfer switch one end. Inverter to other end, and to the middle you connect the Feed line to a "SUB" panel mentioned above

AUTOMATIC transfer switch.. Same basic hooikup only

INVERTER.. IF you turn the inverter off it can go to either Generator or Shore (mains) input

Mains goes to the other. IF you do NOT turn the inveerter off then it goes to SHORE/MAIN input and the mains go to Generator (From teh 30 amp breaker in the MAINS box)

In both cases the LOAD is conneted to the sub panel as above

The FW is 110V all appliances, it has had extra 220V power points and main added, 220V 50hz goes through a step down transformer to all but the 220 V power points, it can still be used with 110V as with a generator. I have added a what I think will work, power from main board to a junction box with 1 going to inverter and 2 going to to way switch in 1 return from inverter to to way switch in and return to sup panel, 2 would be when connected to 220V and 1 generator at 110V 60hz

Not clear about a few things.
1. The Magnum OUTPUT is 60htz. So, when on Invert your frequency will NOT be 50 htz but 60htz which will cause certain motors and such to run faster
2. Are you adapting a USA built RV to Australian current?
3. Have you tried to find a Magnum with 50htz operation? This would be the best solution
4. If you have a USA built RV, what about operating all the 120/60htz appliances 0n 50htz? Is that OK? Doug

Really expensive and sophisticated inverter to use with the charger and load support features disabled. Hopefully it was low priced.

The transfer switch has two input and one output.

Remove the cable from the MSH3012 output and connect the cable to the new transfer switch output.
Remove the cable from the MSH3012 input and connect this cable to the normally closed input of the new transfer switch.
Get new wire and connect the output from the MSH3012 to the normally open input on the new transfer switch.

You will have no utility power going into the MSH3012 so the inverter will not charge the battery. But I think that was part of the original issue. Get a separate battery charger rated for the local voltage. This charger needs to draw power before the transfer switch or you will have a power loop with the inverter. Or manually plug it in when the inverter is off.

Here is how I wired my ATS with help from diagrams and folks here to get the "best" way for us.

http://forums.goodsamclub.com/index.cfm/fuseaction/thread/tid/29316554/gotomsg/29335313.cfm#29335313

Key features:

1. Inverter can be turned on, but the ATS will switch with priority over to shore power/generator power via the camper's main cord.

2. If shore power/genny is not available, the ATS switches over to Inverter 120v power feed for the camper

3. Additionally, the shore power/genny side of the ATS powers a 120v receptacle I added that the new converter/charger plugs into. So the battery charging and 120v to 12v converter circuits are only powered when plugged into shore power or generator power


My invert does have a "bypass" mode that is supposed to act like ATS, but a separate Automatic Transfer Switch seemed the better choice overall.

Here's my wiring diagram from the link:

theoldwizard1 wrote:

Slownsy wrote:
It is because in Australia we only have 50hrz so switch won't close.

Frequency (50Hz vs 60Hz) should have nothing to do with the relay pulling in.

Contact the manufacturer.

The Magnum does qualification tests on the shore power input before engaging the transfer switch. The relay is not pulling in by design. At least my theory.

So it thinks there's something wrong with the input power?

Tried talking to tech support? The Magnum are computerized, they may be able to adjust the operating frequency.

I think a single simple transfer switch to your main panel should work. Input A would be shore power, input B would be the Magnums output.