I have fabricated a solar powered fountain system in our garden. That must save all of 20p per year! I can look at it and enjoy the cascading water without fretting over the CO2 for what is a non essential luxury water feature. It uses a 10 Watt 12 Volt panel to charge a sealed lead acid battery (from a mobility scooter). The home made controller shuts down the load before the battery goes completely flat and switches to trickle charge if it is full. It generates enough to power a small inverter too for low power mains devices in the garden as well.
My wife (Y) has a well paid job as a senior learning disability nurse doing 12 hour shifts and nights. I am a part time house husband and part time self employed electronic repair tech. I don't feel demasculinized at all not being the main bread winner and I think I have got the better half of the deal. Y likes her job (except for the staff politics bs). I have one 14 year old daughter to keep an eye on and she pretty much looks after herself. All I have to do is iron a few blouses, be here when she gets home from school and cook her some tea. I have to nag her to put the bottles and cans out and to do some maths.
Most of my work as Laluna Technology (www.laluna.co.uk) is fixing band, DJ and HiFi gear (guitar amps, valve amps, mixers, speakers) and LCD televisions.
I did an engineering degree course at Warwick (EDAT - Engineering design and appropriate technology) from 1991-94. It is an accredited BEng course for well meaning environmentally aware hippy types. I am proud to say I fall into that category. We all had to do a domestic PV solar in the UK feasability study as a project. The correct answer was don't bother unless it is for purely environmental reasons and you've got some spare cash. Nowadays with the high energy prices and the FIT, the answer will be different.