Sunday, 25 January 2009
Devon Off Grid
We completed an Off Grid electricity system today. Consisting of 720 watts of Sharp PV monocrystalline modules mounted onto a custom made support frame, and a 1kW Futurenergy mini turbine on a 9 metre Altron tilt over tower.
Both these power sources have been designed to complement each other. When the weather is sunny and calm, the PV modules can push out up to 24 amps of power to charge the 540Ah battery bank, which runs a 1500 watt pure sine inverter.
Of course, there are many days in the UK, when daylight is low and bad weather rules, which is where the wind turbine comes in, keeping the batteries topped up while the PV modules struggle, and of course overnight the turbine comes into its own!
The whole system has been designed for a light load of A+ rated fridge, consuming only 150kW a year. Plus lights and TV/radio when required.
Keeping the batteries up to a decent voltage without too much loading is best for any off grid system to
ensure it will give years of low cost power.
Couple of images here.. The Concrete base with just cable duct and bolt studs poking out, and the other shot with tower base in position, with horizontal tower being painted.