Use only a pure sine inverter, unless you only want to power a couple of lights. There's a lot of stuff that will not run with modified sine waves.
Pure sine wave is always best because anything will run on it. That said there are grades of "pure sine wave". A Xantrex PROwatt SW 2000 watt "pure sine wave" inverter is a lot less expensive than a Xantrex PROsine, and the quality of the output is a lot lower. The PROsine specifies the distortion, and has tighter tolerances on the output voltage and frequency.
There are many things other than lights that will work fine on "modified sine wave". Any device with a universal power supply that says it can run on anything from 100 to 240 volts without switching, will run just fine on modified sine wave power.
Get a lot of panels... More than I have. Get twice as much as you think you need. Charging is slow.
My first two systems had 3 panels each for a total of 55 watts per system. One system runs my CPAP at night and charges my cell phone. The other system runs my ham radio.
Everything was fine all summer, but come winter the system for the CPAP could not keep the battery charged, so I had to supplement the solar charging with an AC powered charger. I have now bought another 55 watt system and put 2 of the new panels on my CPAP system (because that was the limit of the charge controller). So I now have 91 watts of panel and I am hoping that will get me through the winter without needed extra battery charging.
Incorporate wind. I can't speak from experience but I've read that they cost more for good reason. A wind turbine may be my next addition.
I have a friend with a (now broken) wind turbine. He tells me it is very hard to size them so they produce useful power at a given location. He found that his turbine produced useful power only on rare occasions because most of the time the wind was either too slow or two fast.
The manufacturer of his turbine went out of business, then the bearings died and trashed the windings of the turbine. The cost to repair was very close to the new cost so he has not had it repaired.
Use the heaviest wire you can, with the shortest possible run. It seems that every inch of extra wire = power loss.
True, but this is most critical in the high current parts of the system. My solar panels came with very thin wire, and I replaced the long run into the charge controller with 10 gauge speaker wire. For my battery bank I connected the batteries together with the heaviest gauge (lower number) battery wires I could buy at Walmart, and did the same to connect the batteries to the big inverter.