Question about Inverter Aims Pure Sine Wave Power 2000/5000w

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Want To Install a 1250 W Power Inverter on a Class A Motorhome

My wife and I dry camp with our A Class Motorhome. There are restrictions on when you can run the generator to provide 110 V.
I want to install a Power Inverter that will handle TV, VCR etc.
My motorhome electical system 110V outlets has two lines from fuse panel. One handles crubside of motorhome (Refrigerator, water heater, furnace). The other handles roadside (TV, Mico Wave) I am interested on providing inverter power to roadside only.
My plan is to hook the Power inverter to battery cables that are hooked to the Power converter (which would not be operating since there is no 110V provided from generator or shore power) Hook the out let of the inverter to the roadside outlet line therefore providing power from batteries. I plan on installing a breaker/switch which would allow the inverter to work on when the other power sources are isolated.
Am i on the right track on slovong this problem? Any help would be appreciated.

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  • dljacks48 Mar 14, 2009

    Gary,

    Thank you!

    I really appreciate the help! I thought I was on the right track and you have confirmed it!

    Regards,

    Don

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You are definitely on the right track. When you choose your power inverter consider the following: buy the inverter for around 40% more of your anticiapted load. You will need a double pole transfer switch to isolate the inverter from the generator(and visa versa). A simple double throw double pole switch with fuse or breaker protection should do it. You wouldn't necessarily have to isolate the curbside circuit as the double pole double throw switch would simply be switching the power from the existing generator to your new inverter for only the roadside circuit; i.e. you don't need to worry about the curbside power source as it will always be connected to the other branch circuit. Even if your generator or other source came on the system would be protected no matter what the the roadside configuration was set to as only one source of the 2 roadside power sources would be connected at any give time to the roadside circuit. The six dots represent the connecions for the double pole, double throw switch; shown supplying the new inverter to the roadside circuit while the source from the existing generator or inverter is disconnected via this switch from the roadside circuit:

existing * *------* new power inverter; switched to source
* *------*
^
Middle 2 dots represent your roadside circuit and represent the "throw arm" of the switch. Safe and simple! If you don't have a voltage meter for your batteries you can purchase one for a few bucks. Just run it across the terminals so you will know battery condition as it is being drained (you may already have this indicator) You can find a transfer switch at an electrical supply place, maybe even Lowes. Make sure you get the switch that will be in a protected enclosre. The enclosurre can be purchased seperately if you can't find the switch/enclosure package together.

Good luck....gary

Posted on Mar 14, 2009

  • Gary Redden Mar 14, 2009

    My drawing got shifted around when I uploaded it.



    Here it is again:



    * *-----* new inverter

    existing cvtr

    * *--- *

  • Gary Redden Mar 14, 2009

    3rd post- My ASCI sketch gets reformatted when I upload my response. Feel free to contact me and I'll send a sketch if you need one. Gary

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DO NOT DO THIS! If I understand you correctly you want to have three ways to have 110 power in your motor home--- (1)Vehicle 12V to inverter to main panel. (2)Generator to main panel. (3)plug the main panel into 110V. If any two of these are connected at the same time and they are both live, somethings going to blow. That's because with AC, the two sources must be synchronized in their cycles very precisely. The utility company connects their power plants together on the grid only with the aid of precise controls. But the really serious problem is the same reason they invented transfers switches for home generators -- if you were connected to (3) and the power went out, and you connected (1) or (2) without disconnecting the dead (3), you will backfeed power to the line outside and you just might kill the lineman who is trying to fix the power outage.

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