Octopus Intelligent Go in 2026 — what actually happens to your home battery

Octopus Intelligent Go is one of the most popular smart EV tariffs in the UK. It charges your car cheaply and adapts to the grid automatically, which is why it appeals to many EV-only households.

For homes that also have a battery, it is a different story.

What Intelligent Go actually does

Intelligent Go works by taking control of your EV charger's scheduling. Instead of you setting a charge window, Octopus monitors:

• Your car's current state of charge and target charge level
• Carbon intensity on the grid
• Wholesale electricity prices (which feed into Octopus's cost model)
• Your home's demand

It then tells your charger — via the Ohme, Indra, Wallbox, or compatible charger's cloud API — when to charge and at what rate.

As of March 11, 2026, Octopus's public Intelligent Go page shows a core 8p/kWh window from 23:30 to 05:30 depending on region, with extra smart charging sessions possible outside that window.

This is the part that matters for battery owners.

The window is not fixed — and that changes everything

To understand why this matters, you first need to understand how a home battery behaves during its charging window.

When your battery is set to charge overnight (say, 00:30–05:30), it is in charging mode for that entire window. A battery cannot charge and discharge at the same time — it is either accepting energy or supplying it. During the charging window, your home's other loads (heating, fridge, lights) run from the grid, not the battery. The battery is busy filling up at the cheap rate. This is exactly how it should work.

Once the window closes, the battery switches to discharge mode. From 05:30 onwards, it supplies the home. This is also correct.

The conflict starts here.

Intelligent Go's dispatch window is dynamic. Standard Octopus Go typically charges your EV overnight within a fixed window that your battery's charge schedule is already covering. Intelligent Go may schedule additional sessions at 13:00 on a Tuesday, or 15:30 on a Thursday — hours after the overnight window has closed and your battery has been in discharge mode all day.

When that daytime session starts, Octopus sends a signal to your EV charger to begin drawing power. Your inverter never receives this signal. Your battery management software never receives it.

From the battery's perspective, a 7kW load just appeared on the house circuit. It is in discharge mode, it sees demand, and it supplies power. It has no way to know that the grid — via Octopus — is ready to supply that load at a cheap rate if the battery would simply hold back.

What your battery does not know

Your battery communicates with your inverter. Your inverter communicates with your solar panels and the grid. None of these systems have a live connection to Octopus's dispatch signals.

When Octopus tells your Zappi, Ohme, or Indra to start charging, that signal goes from Octopus's cloud to your charger. Your inverter never receives it. Your battery management software never receives it.

So the battery discharges. The EV session gets part of its energy from the grid (cheap, via Octopus) and part from the battery (which had been storing solar energy for the evening). The cheap rate benefit is diluted. Your solar storage disappears mid-afternoon.

The real cost

A 10kWh battery significantly discharged during a daytime Intelligent Go session represents:

• Lost solar storage: solar energy you generated that morning, consumed by the car instead of being available for evening demand
• Missed export revenue: if you are on an export tariff, some of that stored energy may also have had export value later in the day
• Reduced evening buffer: your battery enters the peak-rate evening period with less charge than planned

In a worked example with three or four daytime sessions per week, the combined cost can become noticeable over a month in wasted solar storage and avoidable battery cycling.

Why this does not show up as an error

Neither Octopus nor your inverter manufacturer considers this a fault. Octopus's job is to schedule your EV charging cheaply. Your inverter's job is to manage your battery according to its configuration. Both are working correctly.

The gap is that there is no coordination layer between them. Octopus does not tell your battery to hold charge before a session. Your battery does not pause before discharging into what might be a scheduled EV load.

This coordination layer is exactly what 1app.energy provides — with two modes of operation:

Hold mode: When a smart charging session is detected, the battery holds its charge. Everything — home load and EV — runs from the grid via the Octopus cheap supply. Your battery stays available for the evening.

Charge mode: The battery holds AND additionally charges during the session. Your car charges from cheap grid supply, your home runs from cheap grid supply, and your battery tops up at the same cheap rate simultaneously. You end the session with more stored energy than you started with — energy you can use in the evening, sell back on an export tariff, or use to reduce how much battery capacity you need to install in the first place.

Does switching back to Go fix it?

For some homes, yes. Standard Go's fixed window is predictable enough that a battery hold schedule can be set to match. If your daily schedule is consistent and you are not relying on daytime solar very heavily, Go can be the simpler choice.

The tradeoff: you lose the flexibility and carbon-aware scheduling that makes Intelligent Go attractive. And if you have solar, Go's fixed overnight window does nothing to help you capture and protect daytime solar generation.

The better answer is whole-home coordination: keeping Intelligent Go's flexibility while ensuring the battery is protected — and potentially charged further — during any session it schedules, day or night.

If you are on Intelligent Go and your battery is not where you expect it to be in the evenings, this is almost certainly the reason. See exactly how 1app.energy detects and handles it — or tell us your setup and we will review whether your home qualifies.