Yeah, the towel rail is for the people who don't understand kWh. That is 3.5KWH per day, powered using a 640W solar array and a petrol generator when there are

Yeah, the towel rail is for the people who don't understand kWh. That is 3.5KWH per day, powered using a 640W solar array and a petrol generator when there are several days of particularly bad weather. The battery bank stores 1200AH at 24V, and like you we try to keep it at 70% charge or above. Gridspy was born out of monitoring power usage at the house both while there and while back in Auckland (90km away). Read more here (should probably add more numbers to this blog entry) http://blog.gridspy.co.nz/2009/08/the-barrier-house.html http://blog.gridspy.co.nz/2009/08/the-barrier-house.html