North Devon Homes (CP1139)
|Energy Storage in Fuel-poor Households – CP1139|
|Lead agency||North Devon Homes Ltd.|
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.
Interviews will be conducted with households to collect patterns of electricity-using behaviour and previous energy expenditure. The Tesla app will be used to monitor the charging and discharging of batteries in the homes, and Tesla will also provide daily performance data. Verv loggers will be fitted to monitor 5 of the batteries every second, and current clamps will also be installed to monitor the energy drawn by the different household circuits. Householders will also be requested to take regular meter readings throughout the project, to determine energy and cost savings. The households will be interviewed about their experiences of using the battery, any cost savings and other changes in a final interview at the end of the monitoring period.
|Region in which project will be delivered||South West|
|Local Authority areas(s) / key locations in which project will be delivered||North Devon District|
|Details of technologies being trialled (for Technical Innovation Fund only)||Tesla Powerwall 2 – Tesla, battery storage system.
13.5kWh capacity, 3.6kW or 5kW output
|By NEA||By delivery agents|
|Grant amount requested||Match||Gap|
Eligible households assisted
|NEA grant with gap funding||Match||Total|
|8 (+ 3 controls)||0||8 (+ 3 controls)|