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tlaffourtit's avatar
Sep 08, 2014

inverter, batteries,converter,tranfer switch, etc.

We own a 2015 thor ace 30.2 motor home. We are installing a 5000w pure sine wave inverter using 870ah batteries(12v). We are using 12v batteries because I was given them for free and they are deep cell batteries and are new. will also be installing 790w solar panels. we are trying to find out if this is enough power for the unit and would like to verify the manner we are installing them. I need to know how many amps the present converter/charger charges at, if I can change out the transfer switch to a 3 way to include the inverter with the generator and shore power(assuming there is only a 2 way transfer switch installed now), and if I use an inline transfer relay between the inverter and converter will this work correctly.( so the unit does not try and charge the batteries while the inverter is in use) since I never attempted this before I am sure I have most of this wrong. ideas would be helpful

79 Replies

  • 2oldman wrote:
    tlaffourtitkway wrote:
    yes 5000w- 10,000w peak inverter. brand is powerjack. .
    Ok. From what I saw those are 220vac inverters. Ain't gonna do it for you.

    Personally, I think you need lots of study time.

    I already have the inverter and it is 120 v
  • Some/all inverter chargers have a 120v "pass through" (by internal switch) in the inverter section for when on shore power. So all they need is the usual transfer switch between generator and shore power.

    Here we have an actual inverter so no pass through etc so you have to be on one of three 120v inputs and never on more than one of them at a time.

    There is also a side issue of switching time so you don't lose your television settings--people use an inverter/battery UPS set-up for that

    We have had threads on this sort of set-up before. It doesn't matter if it is a 5000w inverter or a 1000w inverter doing "whole house" the transfer problem is the same.

    ( We just plug the shore cable into either the shore power, generator, or inverter(converter off) so I am the transfer switch. :) But I know there are clever ways--you have to pick which is the primary source for the transfer and which the secondary ISTR)

    Over to the experts on all that like smk.
  • tlaffourtitkway wrote:
    yes 5000w- 10,000w peak inverter. brand is powerjack. .
    Ok. From what I saw those are 220vac inverters. Ain't gonna do it for you.

    Personally, I think you need lots of study time.
  • Is that 8 batteries in parallel? Going to need 600 amp bus bars to connect.




    Just need a 50 amp transfer switch. (50a RV assumed) Insert between existing TS and the main panel. Converter needs to be moved to get power from before the added switch.

    I have seen a 3-way transfer switch but not at this power level.

    This inverter? Get a copy of the installation manual and read it at least twice before you buy.
  • yes 5000w- 10,000w peak inverter. brand is powerjack. plan to run entire motor home on it while dry camping. the inverter didn't mention auto transfer switch in manual. as far as having someone else do the work; I rather do it myself. just looking for some guidance since thor doesn't seem to release their schematics or any useful specs on their products.
  • I only have a 2000 watt in my 40 footer which is plenty enough.
    Your inverter will have an internal transfer switch.
    Better get a professional to do the install and wiring. Might need a bigger sub panel.
  • 5000w at 12 volts. What brand makes that? I would think you would go to at least 24 volts for such a high power set up. Then use a 24/12 converter for the incidentals.

    What do you plan to run?

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