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Fox EQ5000 4.92kWh HV Battery (Slave)
Fox ESS Fox EQ5000 4.92kWh HV Battery (Slave)
Fox EQ5000 4.92kWh HV Battery (Slave)
Fox ESS EQ5000 high voltage series — 4.92 kWh a module and the module the PQ1 all-in-one is built around.
Storage earns its keep by moving energy in time: solar generated at noon and cheap electricity bought overnight, both spent in the evening. The numbers that decide whether it pays are usable capacity, charge rate and cycle life — not the figure on the box.
Please read before ordering
If you are adding battery modules to a pre-existing EQ stack, it’s important that the new batteries are compatible with your original battery modules. Please contact your Technical person via the portal and provide a photograph of the original battery stack to help us determine correct compatibility.
About the Fox ESS EQ5000 high voltage series
The EQ5000 is the largest of Fox's EQ modules at 4.92 kWh nominal and 4.43 kWh usable, and it is the module the PQ1 stackable all-in-one is designed around. Six of them make 29.52 kWh.
As with every EQ stack, one EQ5000-M master carries the battery management and the slaves add capacity. Two modules is the minimum and six the maximum in a series stack.
IP65 for outdoor or indoor use, natural convection cooling, charge from 0 °C and discharge from −10 °C.
What each stack size gives you
Two modules is the smallest stack and six the largest:
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 five slaves. Two modules minimum, six maximum.
- 38.5 A recommended discharge, 50 A maximum charge and discharge, 65 A peak for 60 seconds.
- 64 V per module: 128 V at two modules through to 384 V at six, with operating windows of 116 – 146 V and 348 – 438 V.
- On the PQ1 the modules stack under the power unit and the inverter carries the management, which is why the PQ1 packages list slave modules only.
- 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, 375 mm tall at two modules rising to 915 mm at six; 97.2 kg to 271.2 kg.
- Charge 0 to 55 °C, discharge −10 to 55 °C. IP65, natural convection.
Where this battery earns its place
The EQ5000 high voltage series is specified most often for these jobs.
Things worth knowing about this listing
- Register the installation with Fox ESS to activate the 10-year product warranty. The registration page is at fox-ess.com, and the warranty document on this listing has the full terms.
Fox ESS EQ5000-S 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. A stack is one EQ5000-M master plus at least one EQ5000-S slave — 9.84 kWh at two modules.
Why do the PQ1 packages contain slaves only?
On the PQ1 the power unit carries the battery management, so the stack under it is made of slave modules. On an H1, KH or H3 you need a master.
How many will my inverter take?
Between two and six depending on the family — the table on this page has the numbers.
How much can I use?
4.43 kWh a module, at a 90 % depth of discharge.
Can it go outside?
Yes, IP65, outdoor or indoor on the Fox stand.
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.
Usable energy is the nominal capacity multiplied by the depth of discharge, and both figures are in the Technical Specifications. Most current lithium batteries allow 90% or more.
It needs to appear on your inverter manufacturer's approved battery list and the voltage ranges have to match. Send us your inverter model and we'll confirm compatibility before you order.
Most systems stack in modules up to a maximum number of units per installation, given in the datasheet. Keep to the same model, and buy the full stack together where budget allows.
Only where the IP rating and operating temperature range allow it - both are in the Technical Specifications. Cold reduces usable capacity, so a garage or utility space is usually the better location.
Yes, where the inverter supports timed or forced charging. Paired with a time-of-use tariff this is often the quickest route to a shorter payback.
Warranty terms, and the throughput or cycle count they are based on, are listed under the Warranty tab and in the manufacturer documentation.
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.
