The Powerwall battery system is primarily designed to store excess energy generated by solar panels during the day for use at night. The Powerwall is appropriate for buildings with solar panels that generate excess energy during the day in circumstances where there is no rebate for energy exported to the grid. Solar panels installed on buildings which are empty during the day provide little or no benefit to the owner or occupier as the power generated by the solar panels is unused or exported to the grid for no financial benefit.
The solar array must be sized so that the batteries get an opportunity to re-charge during the day. The energy produced by the solar array during the day must be sufficient to recharge the batteries while at the same time providing power to the building. A Powerwall with a capacity of 13.5 kWh will not charge fully during the day unless the solar array on the building generates a surplus of 13.5 kW per day. Prospective battery pack owners should calculate the average daily production of the solar array on the building Vs the average daily consumption of the building to determine whether or not the solar array generates an energy surplus. The battery pack solution can then be sized to match the surplus production.
More information about the average daily production of solar arrays can be found here: click here
The Powerwall 2 will instantly switch to powering the building in the event of a blackout or loss of mains power.
The Powerwall will help reduce exposure to surge pricing if electricity retailers start charging a premium for power consumed between 16:00 and 19:00. The Powerwall can be configured to start discharging after a specific time in the day such as 16:00.
The Powerwall can be configured to charge overnight at cheap rates and discharge during the day when power prices are high.
The Powerall is network capable and can be connected to a local area network via WI-FI or fixed line network cable. It can also be connected directly to the remote Tesla server via the on-board 3G modem. System reports can be viewed via the Tesla Powerwall smart phone app or the Tesla Powerwall web portal. The Powerwall can be configured to connect to the remote Tesla web portal so that system reports can be viewed on any PC via the system owners Tesla Powerwall user account.T