Solar Energy Battery Storage With Tesla Powerwall

Cost – $12499 for a 13.5 kWh system fully installed.

Download Application Form/Specifications

Use with new or existing solar panels. Save on energy costs by using batteries at night.

Tesla Powerwall. 13.5 kWh storage. 5 kW continuous discharge. 7 kW peak discharge

Usage Patterns

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

Blackout Protection

The Powerwall 2 will instantly switch to powering the building in the event of a blackout or loss of mains power.

Blackout Demo

Surge Pricing

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.

System Reports

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

Tesla Powerall Battery Storage System

The Powerwall battery storage system consists of two components, an energy gateway that monitors energy consumption and production and a lithium ion battery pack or packs with an integrated battery management system and inverter.

Powerwall Battery Packs

Powerwall Demo

Each Powerwall battery pack is a self contained module consisting of battery cells, battery management system and an integrated AC/DC inverter. Mutiple Powerwall battery packs can be daisy chained together. The battery packs are connected to the meter board via an AC circuit. The battery packs will draw power from the AC circuit and start recharging when signaled by the Energy Gateway that the building is producing surplus energy and exporting to the grid. The batteries will discharge power into the AC circuit when signaled by the Energy Gateway that the building is importing energy from the grid. The building draws from the external grid when the Powerwall reaches its reserve.

Each Powerwall battery pack has a usable capacity of 13.5 kWh and a discharge rate of 5 kW continuous and 7 kW peak. Up to 9 Powerwall battery packs can be installed in a cluster.

The Powerwall has a 10 year warranty.

Download Application Form/Specifications

Powerwall Energy Gateway (EG)

The Energy Gateway is a mini computer that measures the energy production from a solar array and the energy consumption of the building. Energy production and consumption is measured via current transformer clamps which are connected to the AC output circuit of the solar array inverter and the AC inbound circuit of the mains supply to the building. The current transformer clamps are wired back to the Energy Gateway which monitors the flow of energy into and out of the building. If the building is exporting energy to the grid the Energy Gateway signals the Powerwall to start charging in order to use up the surplus energy. If the building is importing energy from the grid the Energy Gateway signals the Powerwall to start discharging in order to reduce the amount of energy imported from the grid.

The Powerall and Energy Gateway offered in Australia are single phase compatible only. The Energy Gateway communicates with the Powerwall via a direct cable connection and in most cases the Energy Gateway box is positioned close to the Powerwall. The Energy Gateway itself is powered from one of the existing AC circuits in the building. The Energy Gateway can be configured not to discharge the Powerwall until after a certain time such as five pm in the evening.

Electric Car Owners

The Powerwall is particularly attractive to electric car owners who wish to charge their vehicles in the evening from solar power generated during the day. An electric car uses an average of 1 kWh of power per 5 km of travel at freeway speeds. An electric car owner who travels 50 km per day uses around 10 kWh of power. In Perth a 5 kW solar array generates around 21 kWh per day. A Powerwall will deliver 13.5 kWh of power at 5 kW continuous. An electric car charging at at 3 kW will get most of its power from the battery pack. The rest will come from the grid.

An electric car owner who wishes to re-charge an electric car entirely from the battery needs a pack that is sized to re-charge the car and provide power to the house overnight. Otherwise an electric car which starts charging in the evening will quickly deplete the battery pack and the building will cut back to the grid.

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