This domestic installation was designed to run as a grid minimisation installation. Although the grid remains connected it is rarely used.

This is an area with frequent power outages, often for many days so the ability to have power in an off-grid installation when the grid wasn’t available was a major requirement.

Sodium Nickel Chloride (SoNick) batteries were selected as they have the highest energy density of any batteries and are completely safe with no off-gassing or fire risk, meaning there are no safety issues with installing the batteries. As the SoNick batteries operate with no temperature effects and no degradation from -20°C to +60°C there are no issues with either heat or freezing temperatures that are often experienced and the batteries don’t require air conditioning to keep them cool or heaters to heat them enough for them to work.

Lithium-ion batteries weren’t considered due to the difficulty in recycling lithium batteries at end of life and to their inherent fire risk.

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