Wiltshire and Swindon Autumn Green Open Homes
9 - 17 Nov 2024
Not open for visits during this event but enquiries welcome
This event has now finished.
Other email philgilvin@btinternet.com with any questions
Solar Together installation, PV with 3kWh battery, December 2022. Six 390W panels facing south-west, 3 facing south-east. The chart (second picture) shows the performance over the first full year.
Our Energy Supply:
Scheme Used: Solar Together (https://solartogether.co.uk)
ST work with Local Authorities (LAs), who surveys residents and collect names.
Then ST:
Then selected installer carries out installation and commissions system.
Installer Used: Infinity Renewables (https://infinity-renewables.com). Handover pack supplied on completion.
Export Tariff:
Your electricity company should have an export tariff – this will be much lower per kWh than the price at which you buy (e.g. 12p vs. 30p).
Equipment:
Panels: JA Solar (Japan) (https://www.jasolar.com/html/en/)
Inverter & Battery: Growatt (China) (https://www.ginverter.com)
Cost: £11.3k including installation.
Return visits were made later to install:
Performance - Good.
Generated (first year): approx 2,500 kWh = approx the same as our annual electricity usage
Owing to seasonality (more generated in summer, when usage is lower) we only used about 50% of this, and exported the rest.
Therefore our electricity consumption from the grid fell by half.
We have tried to use more electricity when available, e.g. using dishwasher rather than hot water (gas), and (in spring and autumn) using auxiliary electrical heating with central heating turned down.
Estimated Savings
Total for first year about £660
At this rate the payback time will be about 17 y – although energy prices are likely to rise over time, making the payback time shorter.
CO2e saving in first y: about 280 kg.
Tips