1 MWH is an awful lot in 8 days. If my maths are right it is only 152 kwh short of its maximum theorectical output (assuming 6kw peak). It would almost certainly have to be making more than a "100 kwhs a day", more like an average of 125!
Just imagine if it could continue like this you would make 45,000 kwh a year. Say £5400 at 12p a kwh. Three to four year payback.