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Fox ESS PQ1 5kW with 20kWh (4x EQS 5000) Storage
Fox ESS PQ1 5kW with 20kWh (4x EQS 5000) Storage
Fox ESS PQ1 5kW with 20kWh (4x EQS 5000) Storage
Fox ESS PQ1 stackable all-in-one with EQ5000 storage — Inverter, battery, heating and EPS as one line, in one floor-standing tower.
A storage package is the parts of a system bought as one line rather than several: the inverter, the battery and the pieces that join them. The Package Contents block on this page is the definitive list of what ships.
Please read before ordering
| 4 x FE-HV-EQS-5000 | Fox EQ5000 4.92kWh HV Battery (Slave) | |
| 1 x FE-PQ1-5.0 | Fox ESS PQ Series 5.0 kW Stackable All-In-One with Heating Function | |
About the Fox ESS PQ1 stackable all-in-one with EQ5000 storage
The PQ1 is not a wall-hung inverter with a battery next to it. It is a floor-standing tower: the power unit sits on top and EQ5000 modules stack beneath it, with the DC and comms cabling made at the factory rather than on site. That removes the battery cabling, the comms cabling and most of the commissioning.
The battery warming function is the detail that matters in a British winter. Lithium cells cannot be charged below 0 °C without damage, so an unheated outdoor battery refuses to charge on the coldest mornings — exactly when the overnight tariff is cheapest. The PQ1 warms its own cells.
IP66 for outdoor use, a 63 A integrated bypass for whole-house backup, a switchover under 4 ms, and up to three towers in parallel.
Which inverter will run this battery?
This is a complete PQ1 tower: the all-in-one power unit on top and the EQ5000 battery modules stacked beneath it.
There is no separate inverter to choose — the PQ1 power unit in this package is the hybrid inverter, the battery management and the EPS supply, and the EQ5000 modules stack under it with the DC cabling made at the factory. The stack takes two to six modules, so capacity can be added later up to that limit. The Package Contents block on this page is the definitive list of what ships.
Stack rules, cabling and what else the job needs
The details that decide whether this battery suits the system:
- The stack takes two to six EQ5000 modules, 9.84 to 29.52 kWh. Fox's compatibility matrix lists the EQ5000 against the PQ1 and not the CQ7.
- Battery window 80 – 500 V. Maximum battery charge power is 12,000 W across the range; maximum charge and discharge current is 50 A.
- Minimum battery voltage at full AC load rises with the inverter: 78 V on the 3.7 kW, 105 V on the 5.0, 165 V on the 8.0, 207 V on the 10.0 and 247 V on the 12.0. A two-module stack bottoms out at 116 V and a four-module stack at 232 V, so check the pairing before promising full output at low state of charge.
- Depth of discharge 90 %. 4.92 kWh a module nominal, 4.43 kWh usable.
- 3.7 and 5.0 kW have two MPP trackers, 6.0 kW has three, 8.0 kW and above have four, at 8,000 W, 20 A and 25 A Isc each.
- EPS load start capability is 122 A for 2 seconds with bypass to 63 A. Switch time under 4 ms.
- Floor mounted. The power unit is 570 × 420 × 380 mm and 35 kg; the modules stack beneath it. IP66.
- 3.7 to 6.0 kW are convection cooled under 35 dB; 7 kW and above use fans under 50 dB. Battery warming and AFCI are both optional; the DC switch is fitted.
- The datasheet's grid regulation row quotes AS/NZS 4777.2:2020. For a UK G98 or G99 application ask us for the current Fox certificate that matches your firmware and we will send it with the order.
Where this battery earns its place
The PQ1 stackable all-in-one with EQ5000 storage is specified most often for these jobs.
Things worth knowing about this listing
- The PQ1 tower takes two to six EQ5000 modules. The power unit carries the battery management, which is why the package lists slave modules and no master.
- Fox ESS have a video introduction to the PQ1 series.
Fox ESS PQ1 5.0 + 4 modules technical data
Questions we get asked about this inverter
What exactly is in the box?
The Package Contents block on this page is the definitive list: the PQ1 power unit and the EQ5000 battery modules that go under it.
Why are the modules listed as slaves?
On the PQ1 the power unit carries the battery management, so the stack beneath it is made of slave modules. There is no separate master to buy.
Can I add battery later?
Yes, up to six modules. Check the minimum battery voltage at full AC load for your inverter size first — on the 12 kW it is 247 V, so a small stack will limit output near the bottom of the battery.
Which battery does it take?
Fox EQ5000 modules, two to six. Fox's UK compatibility matrix does not list the CQ7 against the PQ1, so do not plan on one.
Is it really all-in-one?
The inverter and battery are one stacked unit with the cabling between them made at the factory. You still supply the AC side, the array and the meter.
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.
