update:

well basically dave i looked into the whole idea... and basically it just seemed all a bit much for one thing. ive decided on the simplest option, even if it is a bit time consuming and not as efficient for the pic. im just gonna save the data to eeprom every 0.25 kwh instead of only saving when pic powers down... this will require a bit more pic power and wont be as accurate since it could be 0.24kwh through when the pic dies... and that 0.24 kwh is not actually added on... this could happen quite alot if the wind is low and the turbine keeps starting and stopping...(although it wont matter that much since the energy out at those stages is pretty negligible anyway) but will be cheaper and easier probably! less things to go wrong in my case