Intelligent Octopus Go Charge Cap examples: small top-ups, low batteries and manual boost

The main Charge Cap guide explains the rule. This page is for the messier question people usually have next: what does it mean on a normal night when the battery is at 20%, the app says 80% by 7am, or someone presses boost because a journey changed?

The useful pattern is not to memorise one perfect schedule. Separate the fixed whole-home overnight window, the smart slots Octopus schedules, any charging beyond the allowance and any manual override you start yourself.

Example 1: a small regular top-up

This is the easiest case. If you plug in often and the car only needs a modest top-up, Octopus should usually have enough room to schedule it inside the smart-charging allowance. The whole home still has the guaranteed overnight cheap window, and any official smart slot outside that window may also discount the home during that slot.

The practical check is simple: look for an official Intelligent charging schedule in the app or charger app before moving household use around it. Do not treat a car waking up, a charger status change or a manual action as proof that the whole home is on a cheap slot.

Example 2: arriving home very low before a long trip

This is where Charge Cap becomes useful. If the car is low and you ask for a high target by the morning, the requested charge may need more time than the cheap smart allowance. Octopus's 7 May guidance says Charge Cap is designed to stop the car before it spills into the expensive part of the charge, or warn you that the target may not be reached.

That creates a real choice. If reaching the target matters more than price, you may need to accept extra charging at the higher rate. If price matters more, lower the target, plug in earlier, or split the charge across more than one session where your routine allows it.

Example 3: manual boost or Max charge

Manual boost is for urgency, not optimisation. It can be the right button before an unexpected journey, but it should not be treated as the same thing as an official smart slot. Octopus's Charge Cap explanation says boost charging can be billed differently from scheduled Intelligent charging.

Ohme's current Intelligent Octopus Go support uses the same practical distinction. Normal smart charging works through a target and ready-by time, while Max charge overrides the smart schedule and may cost more during peak hours. If the app says you are overriding the plan, assume the whole-home bonus may not apply unless Octopus or the charger app says otherwise.

Example 4: Ohme users and the Prioritise setting

Ohme users do not manage the new choice in quite the same place as everyone else. Octopus says Ohme schedules are managed in the Ohme app, not the Octopus app. Current Ohme support says the old Price cap feature is removed when the tariff is connected and the new choice is between prioritising savings and prioritising the target.

In plain English, prioritising savings is the safer setting if you want charging limited to the cheap allowance. Prioritising the target is the setting to treat carefully: it may keep charging to hit the battery target, with extra time billed at the higher rate.

Example 5: BMW, Mini or Polestar app control

Octopus's Charge Cap blog says BMW, Mini and Polestar integrations work differently because the battery target and departure time may live in the car's own app. That means an Octopus notification can tell you the plan may exceed the allowance, but you may still need to open the car app to lower the target.

The mistake to avoid is assuming the Octopus notification has changed the car's target for you. If the target is set in the car app, check the car app. Keep notifications on, especially while the new Charge Cap behaviour is still settling across accounts and devices.

Example 6: a second EV or a shared charger

The allowance is easiest to reason about when one connected EV follows one predictable routine. A second EV, shared charger or frequent car swap makes the schedule harder to read. Check which vehicle or charger is actually connected to Intelligent Octopus Go before assuming both charging sessions are being treated the same way.

If one car needs an urgent charge and the other only needs a top-up, do not let the urgent car's boost session become your mental model for every night. Treat it as an exception, then check the next bill against smart-meter half-hour data if something looks wrong.

Example 7: daytime smart slots and home batteries

A daytime smart slot can be useful because Octopus says the home can also get the cheap rate during official scheduled smart charging outside the fixed overnight window. That can tempt people to charge a home battery, run appliances or move other use into the slot.

Do that only when the slot is clearly part of the official smart schedule. If a home battery, solar diverter or charger automation starts doing its own thing, billing may not match the tidy example in your head. For solar and battery homes, the separate follow-on question is import and export value, not just whether the car got a cheap slot.

When Intelligent Go still fits well

Intelligent Octopus Go still fits many EV households because it combines a fixed overnight whole-home window with smart charging outside that window when the system can schedule it. The newer Charge Cap framing mainly asks you to be more honest about very large charges and manual overrides.

If your normal pattern is frequent small top-ups, a compatible car or charger and a routine where the car is plugged in for long enough, the examples above are mostly reassurance. If your normal pattern is last-minute large charging, repeated boost use or a setup you do not want to monitor, standard Go, Agile or a simpler tariff may be worth comparing.