Initially we installed an in-roof mounted PV array on the SSE facing roof to supply power to this detached new build house. After a period of monitoring the output of the array versus their daytime consumption, the owners concluded that the array was generating a significant surplus which was being exported to the grid, receiving a minimal tariff. Subsequently they asked us to retrofit an energy storage system (ESS) to enable them to store this surplus and use it overnight.


The PV array comprising 17 JA Solar 345 Wp modules is in-roof mounted using a GSE mounting system. It is connected to a Soils 6kW hybrid inverter which is mounted in the utility room and is connected to the main distribution board. The inverter is DC coupled to a 10.65 kWh Pylon Force-L2 low voltage battery, comprised of 3 battery modules. The modular construction of the battery provides a flexible solution which allows its capacity to be extended whilst in service.


The inverter is connected to an energy meter which monitors the import and export of power at the incoming supply to the house. It uses this to determine whether power generated by the PV array is used to supply household loads or if there is surplus that can be used to charge the battery. If there is a deficit it will determine whether this can be supplied from the battery rather than importing electricity from the grid.


The inverter is connected to a broadband router which allows it to be monitored online.