Hi Clodhopper,
Last 12 months or so production figs for 3.92 ground mount in carms south facing.
dec 12- 96kwh, Jan 13-88kwh, Feb 13- 180kwh, Mar 13- 304kwh, apr13-416kwh, May 13- 488kwh, Jun13-502kwh, Jul13- 563kwh, aug13- 424kwh, sept13-307kwh,oct13 -177kwh, nov13-139kwh
I actually manage to use about 1500kwh of the 3500kwh produced annually the rest would go into the grid if I did not send it to the store.
"It is a Bosch cold fill as are most, for the thermal efficiency engineers reckon that only heating the water you actually use is far cheaper than keeping zillions of litres in a tank & making the piping system hot"
True if you are using oil,gas or electricty to heat the water. By having oil and wood feeding into a thermal store and also dumping nearly all the excess leccy (about 2000kwh pa) into the store va an immersun for which I get paid about 2p per unit anyway under the 50% deemed rule as well as the FIT and putting the dishwasher and washing mc onto hot fill I get to choose when they are switched on - typically anytime of the year when the sun is shining because i can then guarantee that I will be producing significantly more than i am using.
We have not used any oil for nearly 3 years and our leccy use from the meter is down to less than 2500 units PA. Wood cost is about £120pa to kepp the house at a minimim of 18 degs C.
Have a look at the navitron PV forum - loads of info on systems and pricing. Some have got 4kw systems for less than £6000.
Good Luck
Regen