Does Your Battery Work With Smart Tariffs?

Most battery quotations compare capacity, power rating, warranty and price. All four matter. None of them tells you whether the battery will work with the tariff you were planning to put it on.

That question has a different answer for every combination of manufacturer and supplier, it is invisible on the quotation, and by the time it becomes obvious the equipment is on the wall.

Two different things are being sold as the same thing

A time of use tariff gives you cheap and expensive periods and leaves you to respond. You, or your battery’s own scheduling, decide when to charge. Any battery can do this. Nothing needs to talk to anything.

A supplier controlled tariff is different in kind. Your energy supplier takes direct control of the battery: deciding when it charges, how full it gets and when it pushes power back to the grid. In exchange the supplier pays a better rate, because a battery they can steer is worth more to them than one they cannot.

The second type is where the stronger numbers are. It is also the type that needs your hardware and your supplier’s software to be connected, and that connection either exists or it does not.

What “compatible” actually means here

It is not a cable, and it is not something your installer can configure on the day.

It is a commercial and technical integration between the battery manufacturer and the energy supplier: the manufacturer exposes an interface to its cloud platform, the supplier builds against it, and the two companies agree to support it. Your battery is then controlled through the manufacturer’s servers by your supplier’s system.

That has three consequences worth understanding before you spend the money:

No installer can create it. If the integration does not exist between your chosen manufacturer and your chosen supplier, no amount of good installation work produces it.
It can arrive later. Manufacturers do get added. “On the roadmap” is a real thing, and it is also an entirely unenforceable promise with no date attached.
It can be withdrawn. An integration is a commercial arrangement between two companies, and those end.

A live example, and why it is dated

As of 24 September 2026, Octopus Energy’s own published guidance states that its Intelligent Octopus Flux tariff is compatible with GivEnergy, Enphase, SolarEdge and Tesla Powerwall batteries only, with one further manufacturer listed as coming soon. One battery per property.

We are naming that list for one reason: to show you what the constraint looks like in practice. Do not treat it as current. It is a snapshot of one supplier’s page on one day, and this is exactly the kind of list that changes without announcement. Open the supplier’s own page and read it yourself on the day you are deciding.

We are not publishing a compatibility table across suppliers and manufacturers. Any such table would be wrong within weeks, and a table that is quietly out of date is worse than no table, because people rely on it.

Source: Octopus Energy, Intelligent Octopus Flux frequently asked questions. Checked 24 September 2026, https://octopus.energy/intelligent-flux-faqs/

What you hand over, stated plainly

Handing control to a supplier is a real trade, and the honest version includes what you give up. Using the same published example:

You do not set your own charge levels. The supplier sets targets, and those targets can change through the year.
The battery is held at a minimum state of charge, in this case 20 per cent.
The battery discharges to the grid during the late afternoon peak, in this case within a window from 4pm to 7pm.

For most households that is a good bargain, because the rate more than covers the loss of control. But if you bought a battery specifically to ride through power cuts, or to cover a particular evening load, understand that a supplier controlled tariff is making those decisions on different grounds from yours. What your battery actually powers in a power cut covers the backup side of that question.

The questions to ask, before you sign anything

Put these to the installer in writing, and put the last two to the supplier rather than the installer. An installer’s verbal reassurance about another company’s software is worth nothing, and they are not being dishonest when they get it wrong. It is simply not their system.

Exactly which inverter and battery are you quoting? Manufacturer and model number, not a brand name. Integrations are usually specific to particular product lines.
Does this equipment work with supplier controlled tariffs today? Not “is it smart”, not “is it compatible with time of use”. Those are different questions with easier answers.
Which suppliers and which named tariffs? A yes with no names attached is not an answer.
Does it need an internet connection, and what happens when that drops? The control runs through the manufacturer’s cloud.
Ask the supplier directly whether this exact model is on their list today. Their page, their list, their answer.
Ask the supplier what happens if they remove it. You want to know what you fall back to.

If the honest answer to question 2 is no, that does not automatically rule the equipment out. It may be better hardware, better supported locally, or several thousand pounds cheaper. It does mean you should be choosing it knowingly, with the tariff difference priced into the comparison, rather than finding out afterwards.

If you already own equipment that does not integrate

This is a more common position than the marketing suggests, and it is not a disaster.

You still have the standard export arrangement, you still have whatever time of use tariff you can schedule against manually, and you still have the self consumption saving, which for most households is the largest component anyway. When should your home battery actually charge works through getting the most out of a battery you control yourself.

What you do not have is the premium that comes from handing over control, and it is worth knowing the size of that gap rather than guessing at it. Check periodically whether your manufacturer has been added: this is one of the few things in renewables that can improve on its own while you do nothing.

Where our knowledge ends

We cannot tell you whether a particular battery works with a particular tariff today. That changes on the companies’ own timetables, not ours, and any figure or list we published would carry a date on it for good reason.

What we can do is make sure the question gets asked before the order is placed rather than after, and help you price the difference between a system that can join a supplier controlled tariff and one that cannot.

Eco Connect is an independent advisory business. We do not install equipment, we do not sell batteries or inverters, and we have no commercial relationship with any manufacturer or supplier named on this page.

Information and source control

Information correct as of: 24 September 2026.

The compatibility list on this page is taken from one supplier’s own published guidance on the date shown, and is included as an illustration rather than as a current reference. Check the source before you rely on it, including ours.