Fox CQ7 28 kWh storage bundle ( 1 x CQ7-M and 3 x CQ7-S)

Fox CQ7 28 kWh storage bundle ( 1 x CQ7-M and 3 x CQ7-S) is a Fox ESS battery stack of 4 modules, giving 28 kWh of nominal storage and about 25.2 kWh usable at 90% depth of discharge.

There is no inverter in this package. These are battery modules only. A battery stores energy; it cannot convert it or connect it to the house on its own, so a compatible Fox ESS hybrid inverter is required and is bought separately. The inverter you choose sets the system's AC power output — how many kilowatts it can actually deliver — while this stack sets how long it can deliver them for.

Before you order

• Please note the FE-CQ7-M must be installed with at least two FE-CQ7-S.

System specification

Battery capacity is the manufacturer's nominal figure for this number of modules. Full electrical, mechanical and installation detail for each component is in its own datasheet and installation manual, all of which are in the Documents tab below.

Which inverter does this stack work with?

This is a 4-module stack, and that number is what decides which Fox ESS hybrid inverters will accept it. From Fox's own UK compatibility matrix:

Source: Fox ESS UK product compatibility matrix, 2026 edition, which is in the Documents tab below. Always confirm against the current version before ordering — ask us and we will check it for you.

Whichever you choose, the inverter sets the system's AC output. A 5 kW hybrid on this stack gives a 5 kW system that runs for a long time; a 20 kW hybrid on the same stack gives a 20 kW system that runs for a quarter as long at full output. The battery's own limits are well above either — see the maximum charge and discharge figures in the table above — so in practice the inverter is what you are choosing when you choose the power.

Buying as a package

The components are ordered, delivered and priced as one line, but they are the same products sold individually — each is linked above, with its own specification and documentation. A hybrid inverter and battery installation is notifiable work: it needs a G98 or G99 application to the network operator before commissioning, and MCS certification if it is going on a grant or an export tariff.

Datasheets, installation manuals, warranty documents and declarations of conformity for every component in this package are in the Documents tab below. Contact our sales team at sales@clearraysolar.com for project pricing.