Battery arbitrage
Home battery arbitrage is simple in theory and messy in a real house.
Charging low and using or exporting high is easy to explain. The hard part is doing it without draining resilience, missing comfort needs or fighting other devices.
What makes a good arbitrage window?
A good window is not just a cheap hour. It must account for battery efficiency, future household demand, expected solar generation, export value, fees and whether the home needs backup reserve. A cheap charge can become a bad decision if it displaces better solar or leaves no room for resilience.
The resilience tradeoff
The battery is both a financial asset and a safety asset. A system that empties it for a small price gain right before an outage risk has misunderstood the product. GridPassport should let the home earn or save where rational while protecting the reserve the family actually wants.
Why manual arbitrage does not scale
A motivated homeowner can watch prices for a week. Almost nobody wants to do it for years. Automation matters because the value comes from many small decisions repeated calmly.
Where GridPassport fits
GridPassport frames arbitrage as one possible outcome of a broader operating system. Sometimes the best decision is to charge. Sometimes it is to wait. Sometimes it is to keep the reserve and ignore the market.
FAQ
Home battery arbitrage questions.
What is home battery arbitrage?
Home battery arbitrage means charging a battery when electricity is cheaper or solar is abundant, then using or exporting that energy when electricity is more valuable.
Can a home battery always make money this way?
No. The result depends on tariff structure, export rules, battery efficiency, degradation, fees, household load and whether automation can consistently choose good windows.
Should arbitrage use the whole battery?
Usually not. A home battery also has a resilience role. A responsible control system keeps reserve according to user preference, weather risk and outage tolerance.
Is arbitrage the same as solar self-consumption?
No. Solar self-consumption uses locally generated energy inside the home. Arbitrage is specifically about moving energy across price windows.
Sources
References for this guide.
- Polish Energy Regulatory Office: dynamic price contracts
Official context for dynamic electricity contracts in Poland, including smart meter requirements and 2024 adoption.
- Tesla Virtual Power Plant
A consumer example of home batteries supporting the grid and earning incentives.
- SMA Sunny Home Manager 2.0
A mature HEMS reference for dynamic tariffs, EV charging, heat pumps and battery control.