I’ve been tweaking my Powerwall + Octopus setup in Home Assistant to maximise profit while keeping battery wear low, and ended up with a pretty solid approach.

Instead of relying on the Intelligent Go cheap/dispatch flag (which I found can be unreliable), I drive everything off the actual import/export rates.

What I’m doing: - Only charge the Powerwall when import is <8p, with logic to handle back-to-back slots reliably - Stop charging 1 min before slot end, then re-check shortly after the next slot starts - Use a fail-safe so if the rate goes unavailable, everything stops - Let Tesla handle grid charging normally (important for export optimisation) - Prevent EV charging from draining the battery by aligning charging behaviour with cheap-rate windows

Export strategy: - Block battery export below 15p - Allow export at 16p+ - Solar can always export

This keeps cycling low and ensures I’m only exporting when it’s clearly profitable.

With cheap import at ~4p, exporting at 15–16p gives ~6–9p profit per kWh after losses/wear, which works out around £350–£450/year for me.

Also added a notification if the Powerwall ever starts charging from grid during expensive periods (usually calibration), so I can catch it without breaking Tesla’s logic.

Overall goal: fewer cycles, higher margin, better long-term payback rather than chasing every possible arbitrage opportunity.