So you are all grid tied ? How do you know how much you did produce or where are your KWH flowing to ? If not used at home ..... And how much do you get from the electricity supplier per kwh (if the watts leave your house)
Hi Billi
Yes - grid tied. Total amount generated from a meter that the PV installers put between the inverter and the AC reaching anything else. It's this meter whose readings go to Ofgem for ROC allowances if you go that route. After that, I don't know where my generation goes - if I use it in the house, then so well and good, and if I don't then it goes out to the grid. The latter isn't metered at present. Once Southern Electric (a.k.a. Ebico, etc.) get round to installing an 'export' meter, which sounds like it will be soon, then I'll be paid 18p/kWh for everything it measures (but they will take the potential ~4p/kWh from ROCs on the total generation). I'm kind of expecting they'll come to an agreement about what I might have exported before they fit the meter, as they mentioned this on the phone, but if it ends up that they don't, then at least it will have gone towards the free export meter and installation.
I've also got an OWL/Electrisave 'clamp-on' whole house power meter. This gives an instantaneous power reading (only), and isn't sensitive to direction of flow. Depending which wire I clamp it round, I could measure (1) PV generated power, but I've already got a device which does that; or (2) export/import from grid power (can't tell which, but fairly obvious); or (3) power being used by the house whether from PV or grid. I actually do (3), because that's the one which encourages the turning off of things.
