Personal project - 10.3kW home battery storage and monitoring dashboard
An overview of our home battery project: why we built it, how we set it up, and how we track everything through a custom energy dashboard.
Short summary
Together with my father, I designed and installed a home energy storage system consisting of six 9.6 kWh V-TAC batteries and three MultiPlus-II inverters. The system supports day-to-day electricity price arbitrage, adds significant backup capacity for power outages, and lowers the cost of charging our electric car.
To maximize both savings and battery lifetime, I analysed different operating strategies and tuned variables such as minimum state-of-charge, charging schedules, charge targets, and discharge limits. I then integrated the entire setup into Home Assistant, using Shelly power-consumption gauges to log and visualize our household energy profile. Home Assistant runs on a virtual machine on our home server, with Twingate in a Docker container to ensure secure remote monitoring and control from anywhere.
Motivation: Our goal was to add redundancy to our home’s energy supply, make better use of our solar panels by converting more of that generation into usable, low-cost energy, and ensure we have reliable backup during blackouts. As a bonus, the system also makes good use of an otherwise empty corner of the garage.
Below are a few photos of the installation and overall system layout.
Home assistant dashboard
