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Fox EQ2900 2.88kWh HV Battery (Master)
Fox ESS Fox EQ2900 2.88kWh HV Battery (Master)
Fox EQ2900 2.88kWh HV Battery (Master)
Fox ESS EQ2900 high voltage series — The small EQ module — 2.88 kWh a step, up to 20.16 kWh, for sizing a stack finely.
The reason to store electricity is arbitrage in time: charge when it is cheap or free, spend when it is not. A stack sized close to what a house actually shifts each evening pays back faster than one sized to the nearest round number.
Please read before ordering
About the Fox ESS EQ2900 high voltage series
That is what the EQ2900 is for. At 2.88 kWh nominal and 2.59 kWh usable it is the smallest step Fox's high-voltage range offers, so a system can be sized in 2.88 kWh increments up to 20.16 kWh rather than 4.66 or 4.92 kWh ones.
One EQ2900-M master carries the battery management; each EQ2900-S slave adds a step. Two modules is the minimum and seven the maximum.
IP65, outdoor or indoor, natural convection, and rated to 3,000 m.
What each stack size gives you
Two modules minimum, seven maximum:
Which inverter will run this battery?
This is a Fox ESS high-voltage stack: modules wired in series to a few hundred volts, with one master carrying the battery management and the rest of the stack reporting to it.
How many of this module each Fox inverter family takes, from Product Compatibility Fox ESS UK 2026, the module count range for this inverter family:
Inverters we stock that will run it:
Stack rules, cabling and what else the job needs
The details that decide whether this battery suits the system:
- One master plus one to six slaves. Two modules minimum, seven maximum, 20.16 kWh at full stack.
- 25 A recommended discharge, 50 A maximum charge and discharge, 65 A peak for 60 seconds.
- 57.6 V per module: 115.2 V at two modules through to 403.2 V at seven, operating 97.2 – 131.4 V and 340.2 – 459.9 V.
- Charge derating occurs between 0 and +15 °C.
- Fox's compatibility matrix counts the modules an inverter will carry in total. Where that number is larger than the maximum stack on the datasheet, it is because the inverter takes more than one stack in parallel — the per-stack limit still applies to each one.
- A stack is one module type throughout. Fox modules of different capacities are not mixed in a series string, and a Fox low-voltage battery will not work on a high-voltage inverter or the other way round.
- 570 mm wide, 380 mm deep, 350 mm tall at two modules to 950 mm at seven; 71.1 kg to 230.1 kg.
- Storage temperature −10 to +40 °C. Maximum altitude 3,000 m.
Where this battery earns its place
The EQ2900 high voltage series is specified most often for these jobs.
Fox ESS EQ2900-M technical data
Ordered with this battery more often than anything else
A battery is one part of a storage system. These are the parts our customers add most often:
Questions we get asked about this inverter
Is one module a battery?
No. Two is the minimum: an EQ2900-M master and at least one EQ2900-S slave, 5.76 kWh together.
How big can it get?
Seven modules, 20.16 kWh. Your inverter may cap it lower — the table on this page has the numbers.
How much can I use?
2.59 kWh a module, at a 90 % depth of discharge.
Can I mix EQ2900 with a bigger EQ module?
No. A stack is one module type throughout.
Can it go outside?
Yes, IP65, outdoor or indoor.
Documents, advice and trade pricing
Every datasheet, certificate, installation manual and warranty document we hold for this product is in the Documents tab below. See the rest of our battery range, our hybrid inverters and our solar panels, or email sales@clearraysolar.com if you would like us to check a battery and inverter pairing before you order.
Build your complete solar system
Everything you need in one place.
- Inverters
- Batteries
- Mounting Systems
- Cabling & Accessories
- Protection Devices
Delivery times vary by region:
- UK — 1-2 business days
- Highlands & Islands — 1-2 business days
Returns accepted within 14 days of delivery for unused items in original packaging.
