High power inverters are difficult builds by "experimenters" so most of the ones that can offer one are reluctant to do it for that reason.
Basic reason I do not offer schematics -- First the effort to offer it is EXPENSIVE in time, if you are willing to offer it , it would take many hours ( sometimes several hundred hours ) to make the circuit work reliable.
Just to offer the schematic and CAVEAT EMPTOR for the one trying to build one, is not my doing.
I have many designs that have been done under company money, so those can not be given away, though so many ask me to GIVE them away -- They are not MINE -- period.
To spend the time to develop a KIT that anyone can build takes a lot of time and money that unless many buy it, it would a financial disaster, so a job in futility.
MANY -- means several thousands !!
Now you know the reason why the products from a company like from OUTBACK cost so much, it may take 2000 hours to design a product like the MX60, to work reliably and long term -- do you care to calculate what this development cost is ?.
Many ask me to up load schematics for certain circuits that require a lot of work to build -- and now you have the reason for me not to do it --
Many months ago there was somebody designing a sine wave high power inverter -- that from the beginning had troubles and I started to show him where the problems were -- he may have thought that I was trying to copy ( steal ) such design - so he did not responded to my messages -- still the design has not appeared yet -- HOPEFULLY it will appear one of these days.
The simple high power inverter MSW type, is one using high voltage battery bank from a beginning ( 120 volts) that can be made with most available --FINISHED -- parts with a limited manual work in the output section -- 1 to 10 KW is possible -- but how many members of these groups, if they have a 120/240 volts battery bank, are going to spend the money for such effort ?.
I receive constant requests for complicated circuits, that I do not accept to do, even with CAVEAT EMPTOR -- because it may comeback later with requests to fix what one or a few built and is not working.
Only way, would be if a group of people with enough knowledge in electronics get together and in a group build the prototype and develop the KIT, I have done in Radio and Radio frequency years ago.
Early satellite receivers.
No such group exist for such endeavor.
Nando