In message , Alan
writes
Data logger is the Resol DL1, which cost about £150. It's just a data
connecton to the solar controller, and has 2mb memory on board. Enough for
about 3 months of readings, taken every 5 minutes, of 18 variables such as
temperatures, pump speeds, heat transferred etc.


all that in 1/500th of a byte ?

cunning



--
geoff