Before you sink hours into it: I check honestly whether automatic electricity optimization — charge cheap, discharge expensive — works with your battery, your dynamic tariff and Home Assistant. Including a clear "worth it / not worth it".
Start the free pre-checkA dynamic tariff plus a battery can save up to €1,200 a year. But the free tools (Predbat, EMHASS) are complex, tied to specific inverters and intimidating — and you can't tell up front whether your battery is even controllable via Home Assistant (not just readable). That's exactly what I clarify before you invest time or money.
3 questions, an instant traffic light: likely works / needs checking / unlikely.
Questionnaire → within 14 days an honest report: can your hardware do it, your savings potential, the pitfalls, a clear recommendation. Including an honest "no" if your gear can't do it.
If it's feasible: a ready-made automation, tuned to your devices and your tariff, with a step-by-step guide and one follow-up round. You handle the deployment.
Pay with PayPal — €399Summary: Setup runs fully — charge cheap / discharge expensive is active, measured €180 → €113/month (summer). Traffic light: 🟢 GO
| Battery control | ✅ Anker Solix Solarbank 3 — controllable (local Modbus integration or cloud/MQTT) |
| Inverter | ✅ via OpenDTU/MQTT |
| Price sensor (Octopus dyn.) | ✅ hourly spot prices in HA |
| Home Assistant | ✅ running |
Honest nuance: cloud control has 2-5 min latency (workaround in place) → cleaner upgrade path: the local Modbus integration. Recommendation: 🟢 GO.
Every report is tailored to your exact setup — with real sources per hardware model, never guessed.
I run the system I describe myself — my electricity bill dropped from around €180 to €113 in a summer month, measured. Not marketing, but lived practice, documented in the field report. I'll tell you honestly if it's not worth it for you — that's the real value.
Take the free pre-check Pay with PayPal — €79Worldwide? Yes — the service is location-independent (async, via questionnaire). Examples reference the EU market, but the principle works anywhere hourly electricity pricing exists (UK, Nordics, parts of the US, …).
What if it won't work for me? Then the report says so honestly — before you lose time or money. That's what the free pre-check is for.
Do I need to code? For the report: no. To implement it, a basic interest in Home Assistant helps.