Battery Storage Installers

As a rule of thumb, when installing Battery storage alongside Solar PV, we have on average seen the self-consumption numbers go from around 35/40% to 75/80%, further reducing your energy bills. The higher the self-consumption percentage, the quicker the buy-back period for your installation. 

With some small life-style changes, then these self-consumption numbers can really increase. Such things as timing your dishwasher and washing machine to run in the day-time whilst the sun is out, or diverting your solar to heat up an immersion tank.

This allows you to use your battery storage to be used on such things as cooking in the evening, watching T.V instead of importing from the grid.

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A fairly new concept within the energy market is the idea of making profit from buying cheap electricity, storing this purchase electricity, and then selling it back to the grid during times of high-demand where you can sell it for more than you purchased.

The most beneficial use of your Solar & Battery system is always to self-consume your electricity, however, if you find that you have excess power in your battery in summer months for example, then set;ling back to the grid can increase your return in investment

Selling energy back to the grid is not a new concept, from the days of the Feed in Tariff, and the more recent Smart Export Guarantee. However, what is new, it the ability the ‘play’ the markets. Such tariffs as Octopus Agile will have a continually changing import & export price for electricity. The difference between these two prices is where you are able to join the market and  import during times of low demand, and export in times of high demand.

During summer, your batteries will often fully charge throughout the sunny day so you can use your self-generated electricity whilst you are at home throughout the evening. 

However, on days of low irradiance (cloudy days and winter), you can still make the most of your storage system. If you import the electricity throughout the early-hours of the morning (12:30am to 4:30am for example) at 7.5p/kWh to charge your battery to a set amount. When your home then begins to use electricity, instead of importing this electricity at a high daytime tariff, you can instead use the stored electricity you purchased at the low rate.

Some people really take this further by looking at forecasted weather the night before and deciding home much to ‘fill’ their batteries at the cheaper rate.

Another benefit of having battery storage installed alongside your solar PV system is the ability to still have power when you have power-loss to the building.

The batteries can act as an emergency power supply, where in grid failure, we can still supply power to the property.

The options for back-up power can be as simple and installing a socket outlet to run an extension lead from, or having a changeover switch for circuits deemed essential (usually Internet Routers for most people!).