Building your own solar panels is not that hard. On Ebay do a search for "solar cells 3x6". You can get 40 1.8 watt cells for around 30-35 bucks. You will need tabbing wire, flux, buss wire, a diode and a soldering iron. Next buy a Solar panel frame for $35-50 and buy a piece of glass locally. You can get glass on ebay as well. You must also seal the cells from oxygen to prevent oxygen from degrading the cells. So look up a Encapsulation Kit as well. There are several You tube videos that explain how to put it all together.
So you can get a 65 watt panel for a about 100-120 bucks
Consider getting a European 220 VAC Inverter to power your normal Well pump. In other words have 2 inverters. One at 110 vac to run household stuff and another at 220vac to run your well pump. Search ebay for "power inverter 220v". They have a Universal Socket on them but if you look carefully the socket will accept a normal power plug. What I would do is wire the power to my well pump through a double pole double throw switch so either grid power is going to the pump or a plug that goes to my Inverter. Look up "Transfer switch"
A word about inverters. They are basically power oscillators and the components take a lot of stress. In other words they don't last very long. If you open one up you will see a long row of power transistors on a heat sink. Testing these transistors isn't that hard. Just unsolder them and test them with an ohm meter. So you might open yours up and get the parts numbers off the power transistors and get some extras. Either that or buy a couple extra Inverters. Or just wait till yours blows up, because it WILL.
How to test a Transistor