ShiftCharge.ioLearn · 9 May 2026
Octopus Agile and your home battery: a practical strategy
A plain-English guide to running a home battery on Octopus Agile — what to charge, when to discharge, and where automation actually helps.
Join the betaOctopus Agile is one of the most flexible smart tariffs in the UK, but the price signal only pays off if your battery actually responds to it. This guide walks through how to think about charging, discharging, and the bits that matter most.
It is intentionally vendor-neutral — the same logic applies whether your battery is Growatt, GivEnergy, Solis, or any other hybrid inverter on a smart tariff.
The core idea
Tomorrow’s Agile prices are published the night before. A good battery strategy uses that price curve plus your expected solar generation to pick the cheapest hours to charge and the most expensive hours to lean on the battery instead of the grid.
The trap most people fall into is charging blindly overnight. On a sunny day in summer, that wastes the battery on cheap-but-not-free electricity when you could have filled it for free from the roof.
When to charge
Look for runs of low-priced half-hours that line up with your expected morning demand and any solar shortfall. The exact threshold depends on the standing rate, but cheap on Agile is usually the bottom 25–30% of the day.
Leave headroom for the solar forecast: if tomorrow looks bright, you only need enough overnight charge to bridge the morning, not to fill the battery.
When to discharge
Discharge into your home through the most expensive import periods rather than the most expensive single half-hour. Stretching the battery across the peak is what saves the most.
If you have an export tariff, the calculation flips during high export periods — sometimes selling beats self-consumption.
Where automation earns its keep
Manual scheduling works for a week. Then prices change, solar changes, your kid comes home from uni and the household demand shifts. A scheduler that re-plans daily is what turns a smart tariff from a hobby into a saving.
Common questions
- Should I always charge the battery to 100% on Agile?
- No. Charging to 100% wastes capacity if tomorrow is sunny or if the cheap window is short. A good plan fills only as much as you need to bridge the next expensive period.
- Does Agile beat a fixed tariff for a battery owner?
- Usually yes, if you can shift load. The bigger your battery and the more solar you have, the more Agile pays off compared to a fixed rate. Run a few days through a planner before committing.
Want this running in your home?
ShiftCharge is in private beta. Join the waitlist and we will reach out when there is a slot open for your hardware and tariff.
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