Here are our new solar panels on our farm house. My husband and I installed these ourselves. It took us about 6 hours to fasten all the rails and mount 7 panels. My husband Simon who is a registered Electrician did all the wiring which consists of a 230 volt supply from our switch board to the invertor - picture below
The wiring from the invertor to the panels is DC wiring. The panels convert sunlight (even on a cloudy day) into DC power. The invertor changes it to AC which is the same as in your house. Our system is a 2.2 Kilowatt with a 5 Kw single phase invertor. Our best day of generated power was 15.9 Kw to date.
Any power we don't use is exported back into the grid, unfortunately the power company does not pay much for generated solar power (8c per Kw) so we try to use our generated power during the day. We have a timer on our hot water cylinder and I try to use the oven, dish-drawer and vacuum in daylight hours.
As you can see by the graph here it was a cloudy day with sunny spells and around mid morning and midday the sun came out. The total power it generated was 12.8 Kw on this day taken at 6.22pm.
The cost of our system is about $8,000 NZD without installation costs. We saved on doing that ourselves. We are aiming to save 50% off our power bills. My husband has a Diploma in Solar Installations from Australia., where he worked for 18 months doing solar installs around the Gold Coast and Brisbane.