The Armorgard Volthub™ is a 16-locker, 240V Li-ion battery charging station engineered for construction sites and industrial environments where thermal runaway is a live fire risk.
The Armorgard Volthub™ is a 16-locker, 240V Li-ion battery charging station engineered for construction sites and industrial environments where thermal runaway is a live fire risk.
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Log in to access trade discountsLithium-ion battery fires are the fastest-growing fire risk in UK construction, and standard tool lockers or open charging areas offer no meaningful protection when thermal runaway occurs. The Armorgard Volthub™ is purpose-built to address this: a 16-compartment, IP55-rated charging station that combines active fire suppression, forced gas extraction, and real-time remote alerting in a single mobile unit rated for both indoor and outdoor site use.
Where a standard charging arrangement might allow a single failed battery to ignite adjacent packs and charging equipment, the Volthub's segregated locker design and locker-specific suppression system contain the event at source. The unit is also designed to keep batteries in the conditions they need: optimal temperature, individual ventilation, and OEM-compatible charging sockets throughout.
Locker-localised DLP fire suppression: The 6-litre DLP suppression system deploys directly into the affected compartment rather than flooding the whole unit. This means a thermal runaway event in one locker does not trigger suppression in neighbouring bays, protecting undamaged batteries and chargers.
Automatic 60°C power isolation: When the internal temperature reaches 60°C, power to the charging sockets is automatically cut. Forced ventilation and the fire safety systems continue to operate on 12V battery backup, meaning the unit does not become inert at the exact moment it is needed most.
Negative pressure ventilation system: When a Li-ion cell enters thermal runaway it vents toxic and flammable gases before ignition. The Volthub's forced extraction system actively exhausts these gases rather than allowing them to accumulate, which is the critical risk window in any battery fire.
GSM alert to up to three numbers: The optional GSM module sends calls or texts to designated contacts the moment an alarm is triggered. Unlike fixed alarm panels, this reaches whoever is responsible for the site regardless of where they are when the event occurs.
SP21 external fire alarm integration: The volt-free SP21 connection integrates with most major wireless site fire alarm systems including WES, ProLink, and Cygnus, so the Volthub feeds directly into an existing site emergency response without additional infrastructure.
IP55 rated for site conditions: The unit is rated for both indoor and outdoor deployment. For indoor use, the rear ventilation panel accepts 150mm ducting to exhaust gases outside the building. Crane lifting eyes and forklift pockets allow repositioning across a site without specialist equipment beyond a LOLER-certified lift.
1.5mm powder-coated steel construction: The cabinet body is manufactured from 1.5mm steel finished in RAL 7021 black-grey powder coat. At 334kg the unit is stable in position; heavy-duty 200mm castors with two swivel-braked wheels allow controlled repositioning when empty.
1x Armorgard Volthub™ 16-locker Li-ion battery charging station (240V), external dimensions 1,770 x 750 x 1,820mm
1x castor kit (2 fixed, 2 swivel-braked, 200mm)
1x IP67-rated extension lead
1x SP21 male connector for external fire alarm interface
4x rubber-coated magnetic studs for wireless alarm interface mounting
2x keys
| Specification | Detail |
|---|---|
| Product name | Armorgard Volthub™ 16-locker Li-ion battery charging station - 240V |
| Product code / SKU | VH16-240 |
| Power supply | 240V AC |
| Power inlet | 32A IP67 |
| Number of lockers | 16 (12 small, 4 large) |
| Socket protection | RCD protected (individual per socket) |
| Maximum battery size per locker | 250Wh (OEM, undamaged, regularly inspected) |
| Maximum locker load (UDL) | 40kg per locker |
| Maximum total power draw | 32A |
| Temperature cut-off | Automatic power isolation at 60°C internal temperature |
| Operating temperature range | -10°C to +45°C |
| Fire suppression system | 6-litre DLP fire suppression, locker-localised |
| Fire suppression servicing standard | LPCB LPS1666 |
| Fire extinguisher servicing standards | BS 5306-3:2017 and BS 5306-9:2015 |
| Ventilation | Negative pressure forced ventilation with 12V battery backup |
| Alarm system | Local LED fire beacon and audible siren |
| GSM alert | Optional; call and/or text to up to 3 numbers, 4G |
| External fire alarm interface | SP21 volt-free contact (NO / NC selectable) |
| Compatible fire alarm systems | WES, ProLink, Cygnus and most pre-existing systems |
| IP rating | IP55 (unit body); IP67 (power inlet and extension lead) |
| Crane lifting | 4x crane lifting eyes (all 4 must be used; valid LOLER certificate required) |
| Mobility | Forklift pockets and pallet truck access |
| Castors | 200mm; 2x fixed, 2x swivel-braked; castor plate fitting |
| External dimensions (W x D x H) | 1,770mm x 750mm x 1,820mm |
| Internal dimensions – small locker (W x D x H) | 260mm x 355mm x 260mm |
| Internal dimensions – large locker (W x D x H) | 475mm x 355mm x 260mm |
| Weight | 334kg |
| Body material and thickness | Steel, 1.5mm |
| Finish | Powder coated, RAL 7021 black-grey |
| Keys supplied | 2 |
| Conformity | EN 60335-1:2012; EN 60335-2-29:2019; UK Electrical (Safety) Regulations 2008 |
| Suitable for | Indoor and outdoor use |
| Warranty | 12 months manufacturer’s warranty |
The Volthub™ is intended for site managers, health and safety officers, and facilities managers responsible for cordless tool fleets on UK construction sites, civil engineering projects, utilities infrastructure works, and large-scale facilities maintenance operations. It is suited to any environment where multiple Li-ion battery packs are charged simultaneously and where the consequences of an uncontained battery fire, whether to personnel, assets, or project continuity, are unacceptable.
Charging and secure overnight storage of cordless power tool battery packs on active construction sites where unattended charging presents an insurance and CDM compliance risk
Centralised battery management on civil engineering and utilities projects where operatives work across a wide site and battery collection points need to be repositioned regularly
Indoor battery charging in warehouses, workshops, and plant rooms where exhaust ducting to the 150mm rear vent allows safe gas extraction without exposing staff to thermal runaway gases
Multi-trade sites where different battery platforms are in use simultaneously and segregated compartments prevent charger cross-contamination and simplify PAT audit trails
Facilities management operations in occupied buildings where the SP21 integration feeds directly into a building management or fire alarm system
Temporary site accommodation compounds where batteries are charged overnight without on-site supervision, requiring the GSM alert to notify responsible persons remotely
Plant hire depots and tool stores where a rotating fleet of batteries requires a compliant, auditable charging environment
Position the Volthub™ on flat, stable ground at least 1 metre from surrounding walls and clear of hot works, DSEAR and COSHH areas, naked flames, and high-dust areas.
Lock all four castors before connecting to power.
Connect the IP67 extension lead to the power inlet, inserting and twisting the locking collar anti-clockwise to secure. Confirm the lead does not present a trip hazard.
Turn the isolator switch to "On." Two audible beeps and two flashes from the critical temperature alarm confirm the unit is live. The red LED fire beacon illuminates for five seconds to confirm emergency systems are operational.
Before placing any battery into a locker, inspect it: check for physical damage, swelling, or leaks to the casing; confirm terminals are free from corrosion; confirm the battery is dry; and check for any error indicators on the battery or charger.
Place the battery and OEM charger inside the locker compartment. Push charging leads to the rear of the compartment before closing the locker door. Do not allow leads to cross the door threshold.
For 240V units, press the red test button on each socket before first use each day to confirm RCD function. If a socket trips, remove the plug and press the orange reset button to restore.
Lock the locker door. Batteries must not be charged with locker doors open.
For indoor installation, fit 150mm ducting to the rear ventilation flange using intumescent sealant and a duct clamp, routing the exhaust to outside the building.
If the optional GSM module is fitted, programme alert numbers and message text before leaving the unit unattended.
When charging is complete, remove batteries from lockers. Do not store fully charged batteries inside the unit.
When not in use, turn the isolator switch to "Off" but keep the unit plugged in to maintain charge in the 12V battery backup.
Wear cut-resistant gloves when handling damaged or swollen battery packs. If a battery shows any sign of physical deformation, do not place it in the Volthub: treat it as a fire risk and follow your site's hazardous waste procedure.
If the red LED beacon on the roof begins flashing and the siren sounds, do not approach or open the unit under any circumstances. Evacuate the immediate area and dial 999. If it is safe to do so, disconnect the extension lead from the mains supply. Do not attempt to reset or open the unit until Armorgard has been contacted and re-commissioning has been authorised.
The maximum battery capacity per locker is 250Wh. Do not charge batteries above this rating under any circumstances. Do not stack batteries within a compartment. Space chargers at least 50mm apart from each other within a locker.
The total power draw across all sockets must not exceed 32A at any time. The power supply must include sufficient over-current and surge protection. A qualified person must determine earthing requirements before installation.
Only move the unit when all lockers are empty and all doors are locked. Crane lifts require a valid LOLER certificate; all four lifting eyes must be used simultaneously. Use forklift pockets for forklift or pallet truck movement only, never crane lifting eyes.
Operate within the stated temperature range of -10°C to +45°C. When using outdoors, keep out of direct sunlight and maintain at least 1 metre of open space behind the unit for gas dispersion.
Before each use, visually inspect the Volthub for physical damage. Check both pressure gauges on the front locker lintel: both hands should sit in the green zone. If either reads outside the green zone, remove the unit from service and contact Armorgard.
Inspect the DLP detection hoses inside each locker compartment weekly. Check for cuts, deep gouges, creasing, or folding. Confirm each hose is seated in its friction clips. If a section has come free and shows no damage, press it back into its clip. If damaged, return the unit to Armorgard.
Quarterly, inspect locks, forklift pockets, crane lifting eyes, plug sockets, and rubber door seals to confirm they are serviceable.
The DLP fire suppression system requires annual service by a BAFE-qualified engineer or via an Armorgard service plan. Every five years, the full suppression system must be returned to Armorgard for recommissioning: detection hose and suppressant are replaced in full.
Keep ventilation clear at all times. Clean ducting periodically. Keep the unit free from dust and debris. Do not obstruct the rear exhaust or the locker door airflow at any time.
Q: What is the maximum battery size that can be charged in each locker?
A: Each locker is rated for batteries up to 250Wh, provided the battery is an OEM product, is undamaged, and has been regularly inspected before use. Do not charge third-party, counterfeit, or physically compromised batteries in the unit under any circumstances.
Q: How does the fire suppression system work and is it localised to the affected locker?
A: The Volthub uses a 6-litre DLP (Direct Low Pressure) fire suppression system with detection hoses running through the ceiling of each individual locker compartment. When the detection hose in a specific compartment detects a fire event, suppression is deployed directly into that locker rather than across the whole unit. This means a fire in one bay does not trigger suppression in adjacent compartments, protecting undamaged batteries and chargers. The suppressant is contained in the unit's bunded sump after deployment.
Q: What happens when the internal temperature reaches 60°C?
A: Power to the charging sockets is automatically isolated. The red LED alarm begins to flash and an audible alert sounds. The ventilation fan and all fire safety systems continue to operate on the internal 12V battery backup. To reset, turn the isolator switch off, allow the unit to cool, then turn it back on. If the alarm continues after reset, allow further cooling time and repeat. If the temperature alarm sounds but the ventilation fan cannot be heard, contact Armorgard immediately.
Q: Can the Volthub integrate with our existing site fire alarm system?
A: Yes. The unit has an SP21 external fire alarm interface connection with a volt-free contact that can be wired as normally open or normally closed to suit the existing system. The Volthub is compatible with most major wireless site alarm platforms including WES, ProLink, and Cygnus. Connection requires a 3-core flex terminated into the supplied SP21 plug, then wired into the existing alarm system. Contact your fire alarm system provider to confirm interface requirements before installation.
Q: What do the conformity standards EN 60335-1:2012 and EN 60335-2-29:2019 mean for site use?
A: These are the European and UK safety standards for household and similar electrical appliances, with EN 60335-2-29 specifically covering battery chargers. Conformity means the electrical safety of the Volthub has been independently assessed against defined test criteria. The unit also conforms to the UK Electrical (Safety) Regulations 2008. On a UK construction site, this conformity is relevant to CDM 2015 compliance, insurance requirements, and employer duty of care obligations under the Health and Safety at Work Act 1974.
Q: What does the DLP fire suppression servicing requirement actually mean in practice?
A: LPCB LPS1666 is the Loss Prevention Certification Board standard that governs the servicing of DLP suppression systems. In practice, this means the Volthub requires a weekly visual inspection of pressure gauges and detection hoses by the owner or a competent designated person, an annual full service by a BAFE-qualified engineer, and a full recommission every five years by Armorgard during which the detection hose and suppressant are replaced. Armorgard offers a service plan that can be set up at point of purchase to keep the unit compliant throughout its service life.
Q: How does the GSM alert system work and what network does it require?
A: The optional GSM module alerts up to three designated phone numbers by call, by text, or by both simultaneously when an alarm event is triggered. The module uses a standard-size SIM card, not supplied, which the owner sources and maintains with credit. A 4G-compatible contract SIM is recommended for reliability. The module can also send scheduled status reports and can be armed and disarmed remotely for maintenance. Alert coverage depends on mobile network signal at the unit's location, so this should be confirmed when selecting a site position for the unit.
Q: Can the Volthub be used indoors as well as outdoors?
A: Yes. The unit is IP55 rated and designed for both environments. For indoor use, the rear ventilation panel is replaced with a 150mm ducting flange and a length of 150mm diameter ducting is connected and routed to outside the building, allowing exhaust gases to be safely expelled rather than accumulating indoors. Intumescent sealant should be used to seal the flange to the unit body. The exhaust location must be noted as part of the site fire risk assessment and communicated to the local fire service.
Q: Why buy this from CMT Group rather than directly from the manufacturer?
A: CMT Group has supplied construction sites across the UK and holds ISO 9001:2015, ISO 14001:2015, CHAS Elite, SSIP, and BSIF Registered Safety Supplier accreditations. Most of our products have same or next day delivery, so orders placed before 7pm online are despatched for next working day delivery, with VIP dedicated delivery available UK-wide within 2 to 3 hours for urgent requirements. For projects requiring ongoing supply, CMT's EDGE procurement portal provides agreed contract pricing, role-based spending controls, and full document management including proof of deliveries and invoices.
