If you have a solar system that produces more energy than you can use then having a battery allows you to store this energy and use it at night when the sun isn’t shining. The financial benefits of this are that you pay around 25 cents per unit for electricity you use and only receive around 7 cents per unit of energy you export to the grid. By having a battery large enough to power your household energy requirements and a solar system large enough to charge the battery daily you can potentially never have to pay for electricity again. Please note that there are still grid connection fees you can’t avoid!
The TESLA powerwall is a battery most people in or out of the solar business have heard of but there are multiple other options on the market these days too. We have researched the market and options available for you and provide a solution for single phase houses and for three phase houses.
The POWERWALL 2 from TESLA is the best known battery for solar energy storage worldwide for good reason. It is arguably the most advanced system that can be adapted to any solar system, whether 3-phase or single phase. It can be installed at the time the solar system is installed or it can be added later. You can also add this battery even if you don’t have solar. The POWERWALL connects to the grid, the solar system and the battery through a module known as the GATEWAY. It allows you unparalleled control of your system for monitoring and also for modification of charging and discharging times and parameters. The POWERWALL will operate in the even of a grid failure. Each POWERWALL 2 has 14kWh of energy storage of which 13.5kWH can be used. You can add more if you require additional storage. The POWERWALL can discharge at a high rate to power most appliances in your house, 5kW continuous and 7kW peak. Each POWERWALL battery costs $10,000. The GATEWAY is an additional $2000 and installation is $2000. Additional batteries do not require additional GATEWAY modules.
The ALPHA eSTORE system is a battery storage system suited to single phase houses that incorporates a Goodwe inverter, 10.3 kWh battery storage and a UPS. This system is very neat with all components integrated into a single unit. The UPS allows the battery to operate if grid power is lost. This is perhaps the most cost-effective and reliable solution for residential houses with 2-5 occupants who want to store the solar energy harvested by the solar panel system during the day and use it at night rather than purchasing from Synergy.