Redneck in training
Elite Member
According to the data with the A/C unit it has a "total unit amps" of 30.7 and it is single phase 220-240v
At 240 volts that would be 7369 watts needed to operate the unit.
I would assume that would be for A/C-Heat Pump operation since it takes an additional breaker to run the heat strips. The heat strips are actually optional and the unit can run without them. In fact, the heat strips could be connected to the grid while the A/C-Heat Pump is run from the Solar Power.
As far as roof area, I have an East/West roof - no South facing roof. However, I have 30 acres so finding a place to put a free standing array would not be a problem. I am also capable of DIY.
With this information is it possible to give a more bottom-line type figure for the panels and inverters needed. As far as a frame, I am sure I could build something if need be.
Typical 60 cell panel is 250W DC. The typical efficiency of the system is about 0.85-87. You need 7400W/0.85/250=35. You will need 35 ea 250W panels. Then you have to decide if you want to use single inverter or microinverters. There are pros and cons for each.
Single inverter is generally cheaper, can be placed close to the grid connection. But you have to deal with high DC voltage, there is possibility of arcing etc. Adding panels later on might be also problematic because all panels in the branch has to have the same specs. Shading of one panel affects the whole branch.
Micro Inverters are more expensive but you don't need to deal with high voltages. Wiring is easy because of pre made cable with connectors. You can mix different panels in the array as long as they are compatible with the inverter. Since the inverters are at the array voltage rise between the array and the grid connection is potential issue because the inverters disconect when the voltage rises above 260V AC. In example if you are close to the substation voltage in your place might be at the upper limit (250V) then you have only 10 V cushion for voltage rise between inverters and the AC connection point. In other words the length and gauge of the cable might increase the cost of the system.
Preferably you should buy all the material from one source so the connectors on the panels and microinverters match. You can usually get substantial discount when you buy all the hardware as a package.
Before you start the project make sure that you know what the incentives, regulations and fees are. Do you need a permit? Can you do it all DIY or does the electrical part have to be done by licensed person? What inspections you need? How the metering is handled? etc.