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Eleven Energy battery system |
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This page gives details of the Eleven Energy sodium ion battery installed at the end of Sept 2026 
The sodium-ion battery is made by Eleven Energy I have two 4.5kW battery modules installed and the system is linked to my electricity tariff so that it charges overnight on the cheap rate. It can also be charged from my PV but filling it overnight helps maximise my export during the day. The app is very easy to use and optimises automatically with my export tariff to export at the highest rates each day. It also gives me the ability to programme specific charge/forced export schedules which I have been using for the free electricty hours on Sundays from Octopus. The battery is automatically disabled when the EV is charging. I was on Outgoing which pays 12p/kWh for all export so initially set it to export 5kWh between 5pm and 7pm each evening to help the grid and get some income (as imported at 6.6p/kWh). But after a week I changed my export tariff to Agile Outgoing which tracks the wholesale market so export rate varies every half hour. The app optimisation chooses when to charge and export each day based on the import / Agile rates After my first full month I have nearly doubled my export and income from export compared to previous Octobers, and that included the first week or so learning my usage pattern and being on Outgoing. 
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