I have 16 solar panels already. My wife's Oxygen units use a lot of power but I can live with that cost.
I chose no heat on my new split units...being cool is what we needed and her oxygen converters are heat producers, a lot of heat.
As to cost...every job will be different, wiring, hardware for mounting, paint, access, new electric boxes for each unit with shutoffs, connectiion to my solar meter etc ...but I am pleased with, after conversion to USD, a cost of $2300.00....
As to contact....I will share that on a case to case basis....as some of the posters would not pass my standards.
Fred Habacht