Tesla Powerwall 2 batteries charged using off peak electricity (CP1139)

This project will install Tesla Powerwall 2 batteries in all-electric, storage heated properties in North Devon using an Economy 7 tariff type. These homes are at particular risk of fuel poverty due to the higher cost of using electric heating. The project will be the first in the UK to use Tesla Powerwall 2 batteries without solar PV and only charged from the grid.  The aim is to assess cost savings to householders by charging the battery overnight from the mains, using cheaper off-peak rate electricity, and using this stored energy to reduce household daytime peak-rate energy costs. Previous evaluations studied smaller batteries (typically 2kWh), with smaller power outputs (500W-1200W) on homes with solar PV. This study will assess the benefit to high electricity consuming households of the greater battery capacity (13.5kWh) and higher power output (3.6kW or 5kW) of the Tesla Powerwall 2.

North Devon Homes and NEA will identify potential properties to be surveyed for suitability and 8 will be fitted with a battery by SunGift Energy. 3 similar control properties will also be monitored in comparison. The households will be monitored from spring 2018 until January 2019, to determine cost-effectiveness and savings.