Why do the project
Solar array mounted on outbuilding roof
Four banks of three 250watt panels each mounted in an antitheft frame and each frame feeding a grid tie inverter typically at 24 volts DC
What we have learnt
Graph of power control done via a Raspberrypi processor.
Blue is solar energy,
Red is extra power from city council - overgenerating when goes below zero axis (shown as dark blue)
Purple is total power used (solar and city council)
Numbers 1,2,3 refer to control of individual grid tie inverters to shut off part of network- 0 is all grid ties are working
Letter P indicates swimming pool motor control (Red is ON and blue is off)
Khaki graph uses right hand axis and shows instantaneous voltage from city council
Solar power generated on one day in winter
Solar power generated over the month of June 2019
Solar power generated over the first six months of 2019 showing comparison between summer and winter.
Typical profile of electricity supply from council.
Grid Tie inverters
Connecting a grid tie inverter to mains.
Power measurement systems
Batteries - not useful
Security - Why do people want to steal the panels
Converting system to off-grid for load shedding
KEEP WATCHING - Site still being developed
4 July 2019
Also see an article on battery storage systems
Also see an article on Energy equivalents
Also see an article on Converting solar energy to useful electricity