Electricity storage . . .
To maximise self-consumption from a PV system we have a few options to store the energy during the daytime and release when required. The way we do this is by using house batteries, hot water storage or diverting the energy to an electric vehicle.
There are numerous options for house batteries, but they all try to achieve the same objective of storing the solar energy instead of exporting it to the grid. This is done by measuring the power consumption of the property, and as electrical energy starts to flow to or from the grid depending on the usage, then the battery will respond and either store or release electrical energy to maximise self-consumption. An added benefit to batteries is that they have a time of use function, which in conjunction with certain tariffs from the electricity suppliers allows to import energy from the grid when the suppliers are offering it at a reduced rate. This creates savings by enabling energy to be stored from the grid and consumed at other times when energy tariffs are more expensive. This is particularly useful during the winter months when less solar energy is being generated.
Hot water diverters
These devices are used for diverting excess energy into the hot water cylinder. The hot water diverters work by using the existing hot water cylinder and immersion heater to divert power in the same way as the battery does. Subsequently, the energy is stored as hot water allowing you to reduce consumption of gas or oil to heat the hot water. Some of these devices can also be paired up with a car charger and divert the energy into an electric vehicle when not being used by the household.