Solar Voltaics have selected two of the most advanced battery systems available on the market – Tesla Powerwall 2 and Givenergy. Not only do they have excellent storage capacity and warranties, but they are designed to integrate with smart energy tariffs such as Octopus Agile and Octopus Go. By combining battery storage with one of these ‘time of use’ tariffs you can make dramatic savings in your energy costs.
Solar Battery Storage
Tesla Powerwall 2
Powerwall’s lithium ion battery inherits Tesla’s proven automotive battery technology to power your home safely and economically. An integrated inverter reduces external components, which simplifies and lowers installation costs. Powerwall is a completely automated system that requires no maintenance. The Tesla Powerwall 2 AC is a fully integrated AC battery system for residential or light commercial use. Its rechargeable lithium-ion battery pack provides energy storage for solar self-consumption, load shifting and backup power.
- Fully installed from £9,550 + VAT (No VAT if installed with Solar!)
- Large stocks on order.
GivEnergy
Hybrid inverters are ideal when installing solar and battery storage at the same time. The hybrid inverter converts DC power from the solar panels into AC mains power, but also manages when to charge and discharge the battery. Because all this happens in one unit it reduces the overall cost of the system whilst maintaining high efficiencies.
AC Coupled inverters are ideal where a solar PV system is already installed with an existing inverter. The addition of the AC coupled coupled inverter is purely for managing the battery charge and discharge.
- Fully installed from £3,542 + VAT (AC Coupled + 2.6KWh battery) (No VAT if installed with Solar!)
Understanding Solar Battery Storage
Your solar PV system without Battery Storage
The solar PV system on your roof will generate electricity during the day that you can use in your home. Without a means of storing that solar electricity, any surplus energy that you don’t use is ‘exported’ to the local grid. During times when the panels are no longer generating (or not generating enough for your needs), you need to buy electricity back from your electricity supplier.
Solar PV with added Battery Storage – How it Works
‘Energy storage’ lets you store the surplus solar electricity, instead of exporting it. Battery storage lets you use more of your solar PV system’s output (in the jargon, it ‘increases ‘self-consumption’). This reduces the amount of grid electricity you need to buy, saving you money on your electricity bill.
During the day:
- The solar PV system generates solar electricity.
- The solar battery storage system will check if all the generation is being used to power your lights and appliances.
- If you’re not using all the electricity that the solar PV system is generating, then the system will ensure that any surplus energy is used to charge the battery.
- Once the battery is fully charged, if there is still more solar electricity being generated, this will be exported to the grid (or in some systems, will be diverted to other uses e.g. to an immersion heater).
In the evening or at time of low solar weather:
- The solar PV panels have a reduced or zero output.
- The battery system can discharge the stored electricity, providing you with renewable-generated electricity at no additional cost.
- Once the battery is discharged, if you need to use more electricity, you buy it from your electricity supplier.
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