About the Customer
Suttons Farm consists of numerous building for agricultural and residential use. With a forward-thinking site owner, making significant investment in decarbonized heating, a daily import was in excess of 100 kWh. The 3 phase site supply has an Economy 7 tariff allowing them to benefit from electricity at 8p per unit over night, but daytime remained the highest consumption period. Daily spend on electricity was becoming an increasingly good opportunity for optimisation.
How did Wattstor help?
Wattstor installed their propriety Energy Management System, iMP, at Suttons Farm ahead of any other assets. This allowed Wattstor to monitor the consumption of power at sub distribution board level with minute by minute accuracy. With this real and accurate data, Wattstor were able to specify an integrated solar storage system in which output power, storage capacity and generation are each separately tailored to the Farm’s requirements.
A single piece 3 phase inverter/charger was sized appropriately to match the maximum power demand of the site. Directly linked DC solar PV can then be added behind piecemeal to the system as different roofs are developed, without requiring their own G99 applications. A total of 60kWp of solar PV will be added over a number of months, with each array commissioned as they go.
A 108 kWh battery provides storage suitable to the sites daily import, minus direct solar consumption. In the summer this will capture excess generation for use at night. Through the winter, off peak tariff electricity will be used to fill the battery at nighttime, and used in place of daytime import.
Wattstor’s iMP Energy Management System forms a closed loop controller for the battery system, accurately matching inverter output with the demand for power on site. In later phases it may also be used to integrate thermal storage into the energy management scheme, activating heat pumps when the battery is full.