Dynamic versus fixed contract: which fits a battery?

A fixed contract is predictable. A dynamic contract follows hourly prices, which enables battery arbitrage but also passes price spikes through to you.

With a battery Only with a battery and the self-plus-arbitrage strategy does the upside of dynamic really show. Without a battery it is mostly a bet on when you happen to use power.

The pitfall If you charge an EV on dynamic prices, it already grabs the cheapest hours. That cuts your battery's extra arbitrage value sharply. Switch both on in the calculator and see the effect at once.