Currently these are the two systems recommended for home owners, for commercial use we would need to assess each unique site to specify battery recommendations.

Tesla Powerwall

Powerwall is a battery that stores energy, detects outages and automatically becomes your home’s energy source when the grid goes down. Unlike generators, Powerwall keeps your lights on and phones charged without upkeep, fuel or noise. Pair with solar and recharge with sunlight to keep your appliances running for days. Powerwall reduces your reliance on the grid by storing your solar energy for use when the sun isn’t shining. Use Powerwall alone or combine it with other Tesla products to save money, reduce your carbon footprint and prepare your home for power outages.

With the Tesla app, you can monitor your home’s energy production and consumption in real time. Set your preferences to optimise for energy independence, outage protection or savings. With instant alerts and remote access, you can control your system from anywhere. With easy installation and a minimalist design, Powerwall complements a variety of home styles. The compact, all-in-one construction features versatile mounting options for indoor or outdoor spaces. Manufactured in the US to the highest standard of safety and quality, Powerwall is backed by a 10-year guarantee.


The sonnenBatterie is a high-tech storage system that has proven itself in thousands of households – every day. The combination of a PV system and a sonnenBatterie will allow you to cover about 75% of your yearly energy requirement with self-produced and clean energy. Since your energy is being generated on your roof and not by some anonymous energy provider you are more independent than before. So take your energy future into your own hands and reduce your energy costs to a minimum. The decision for a sonnenBatterie is also a decision for the highest standards in safety and quality that ‘Made in Germany’ stands for, backed by a 10-year guarantee.

The sonnenBatterie was developed as a multi-stage storage system that can be adapted to the most diverse energy needs. With storage sizes ranging from 5-15kWh the sonnenBatterie will power a detached house. The sonnenBatterie’s energy capacity can be individually expanded in blocks of 2.5 kWh. With three entry levels, sonnenBatterie eco is for those wanting the greatest possible flexibility, sonnenBatterie hybrid gives you maximum cost efficiency and the sonnenBatterie pro sets the new standard for responsible energy consumption in commercial operators.

A home solar system gives you the potential to generate electricity to power your house and appliances but combining this with battery storage gives you the flexibility to utilise this power when it’s convenient, giving you ultimate control and independence from the grid.

Tim Haffenden, Technical Director, NWT Energy
Tesla Powerwall reduces your reliance on the grid by storing your solar energy for use when the sun isn’t shining.
The sonnenBatterie is a high-tech storage system that gives you the flexibility of using stored energy when it is convenient.