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When a rescue operation moves onto tidal flats, offshore islands or unmanned coastal ground, it leaves the grid behind — and with it, communications, equipment and drone support.

On 25–26 August 2026, HQESS took part in a live emergency-response exercise staged on coastal tidal flats. The scenario was a sudden incident in a remote area with no grid connection — exactly the conditions that produce the "triple breakdown" response teams train to prevent: communications lost, equipment down, drones grounded.

A 215 kWh mobile charging vehicle was deployed as the site's power hub.

Communications base stations. Base stations are the command nerve centre of any rescue operation. The mobile unit delivered stable output that kept the link open between the command post and search teams in the field.

Search-and-rescue drones. Drones are the "eyes in the air" over tidal flats, but flight time is the binding constraint. On-site fast charging kept them cycling continuously — reconnaissance, search and image relay.

Rescue equipment. From emergency lighting and command systems to communication terminals and individual kit, everything that needed power was covered.

The engineering behind it

Stable output is the lifeline of emergency work. The unit integrates a BMS and an EMS with seamless grid/off-grid switching. If supply is lost or the grid fluctuates, it takes over instantly — base stations and drone charging are unaffected.

Three advantages over fixed charging

Mobility — deploys and relocates fast: tidal flats, wasteland or city centre.

Fast charging — grid and off-grid modes shorten downtime, turning waiting time into working time.

Multi-purpose — one vehicle covers drone charging, EV fast charging, emergency backup and peak shaving.

Smart operations

An integrated monitoring module tracks remaining charge, output power and equipment status in real time, with remote O&M and metering. Operators can plan charging around off-peak tariffs and schedule drone flight rosters accordingly.

Beyond the exercise: a tracked emergency variant

HQESS emergency-response units combine power supply, satellite communications, drone survey, infrared search and environmental monitoring in a single vehicle. A tracked chassis with unmanned and remote-control capability lets them move through mud and rough terrain and reach high-risk zones — power delivered wherever the response goes.

A large earthworks project had a familiar problem: excavators that need to be charged, a site that moves, and a neighbourhood close enough to hear every diesel engine.

HQESS delivered two mobile charging vehicles in one shipment — 1,075 kWh and 215 kWh — sized to two different jobs on the same site.

01 · Charge at night, work quietly by day

The units charge from the grid during off-peak hours and discharge to the excavators during the day. That combination matters on urban sites next to residential areas: electric machines run silently, with no exhaust and no engine noise — meeting environmental and noise requirements without slowing the schedule.

02 · Cut the cost per kWh

Charging construction machinery away from site is expensive. Where an external charging station charges roughly RMB 2–3 per kWh, charging from the grid during off-peak hours cuts the cost substantially — for this project, savings of about $0.1–$0.3 per kWh. The more the equipment runs, the more the saving compounds.

03 · Keep the machines working

Under the old model, an excavator that ran flat had to stop, be hauled away, charge, and come back — time lost at both ends. With the mobile units on site, machines top up during work breaks and return to work at full charge. No round trips, no schedule slip.

Two capacities, one system

1,075 kWh — high capacity, long endurance and stable output for multiple excavators, large earthworks and overnight continuous work.

215 kWh — compact and easy to reposition for scattered work points, short transfers and smaller equipment.

Both are detachable, highly mobile and easy to transport, which is what a site with changing layouts and frequent relocation actually requires.

Delivery discipline

The units were built, factory-tested, transported and verified by a combined technical, production and delivery team, with safety structures checked item by item before handover — so both units arrived on site on time and in working order.

For a tunnelling project on a compressed schedule, time is cost — and a power interruption is a disaster.

The site needed immediate power for its core equipment, grouting units. Every conventional option was blocked.

Option 1 — mains extension: too slow

The original plan was to run a cable from a substation across the road. That requires occupying the roadway, which in turn requires road-occupation permits from several authorities. The process runs into dozens of days. On a project measured in days and hours, that option simply doesn't arrive in time.

Option 2 — diesel generator: ruled out

A diesel genset failed on two counts. Cost: rental plus fuel, running continuously. Environment: the site sits next to a residential area, and noise and exhaust from a diesel set are restricted under environmental and noise rules — with complaints, shutdown or penalties as the downside. Also unworkable.

The hard constraint

The site's stable operating load is 500 kW — a high-power, continuous demand. Its core equipment, the grouting units, runs 6–7 hours in a single continuous operation with absolutely no interruption permitted. If power is lost for more than about 15 minutes, the underground grout sets, jams the drill bit, damages equipment and forces rework — an irreversible engineering and financial loss.

Uninterrupted, high-stability, zero-fluctuation power was therefore a hard prerequisite, not a preference.

The solution: mobile storage sized to the duty

A 1,075 kWh mobile charging vehicle was selected as the green-power supply.

Two units in parallel, on load: two 1,075 kWh systems run simultaneously to carry the site's 500 kW load.

Two more as standby: matching units are configured as on-load backup, creating layered redundancy.

Seamless on-load transfer: unit rotation and standby switch-in happen without interrupting supply — zero fluctuation, zero interruption, matching the grouting units' continuous duty.

Why it worked

No emissions, no noise — no exhaust, quiet operation, no disturbance to residents; clears environmental and community requirements.

Flexible and mobile — quick to assemble, relocate and position, with no lengthy approval process; fast to bring on site.

Long duration, high power, uninterrupted — covers 6–7 hours of continuous grouting with redundant backup.

The only option that cleared every constraint — with mains power too slow and diesel unworkable, mobile green power was the only route that satisfied schedule, environment, community and safety at once.

HQESS has completed factory acceptance and dispatched a 3.3 MW / 3-hour indoor battery storage system for an overseas project, with the final units consolidated for shipment to the project site.

Overseas storage markets set high bars on safety, stability and grid compatibility. This project was engineered against those requirements from the start.

What was delivered

A 3.3 MW / 3-hour high-safety indoor storage system

16 battery cabinets, organised into 8 clusters

1,375 kW single-unit PCS — among the highest single-unit capacities in its class among deployed overseas storage systems

Safety engineering

The system uses high-safety lithium iron phosphate (LFP) cells, together with a new full-system insulation material that substantially raises high-temperature and arc-resistance performance. The combination is designed to meet strict overseas fire-safety requirements, adding a second layer of protection beyond standard practice.

Performance engineering

The 1,375 kW PCS raises both operating efficiency and grid compatibility — the result of sustained R&D investment in high-end storage hardware.

Factory acceptance before shipment

On 19 March, a full factory acceptance review was completed with the project party and HQESS's delivery partner. A combined technical team verified the complete system item by item, and every indicator met overseas market requirements before the equipment cleared acceptance.

The units were packed and consolidated in early June and are being shipped to the overseas project site.

What it represents

For HQESS, this is a milestone in commercial deployment outside its home market — and a step from product export toward technology, standards and brand export. The company continues to focus on storage R&D and quality, building safer, more efficient systems for overseas high-end markets.

A large used-EV storage yard holds more than a hundred electric vehicles at any time. The operator noticed a problem: leave a car parked for more than two weeks and its state of charge can fall below 20%, eventually tripping the BMS undervoltage protection. The vehicle can no longer start — or move.

Conventional fixes all fall short:

Fixed chargers require site modification and extra electrical capacity — high cost, low flexibility.

Towing to an external charge point costs roughly $30 — $70 per trip, plus labour and time.

Storing at low charge accelerates degradation of the lithium-ion cells, reducing cycle life and — for used vehicles — residual value.

The solution: charging without infrastructure

HQESS deployed a 215 kWh mobile charging vehicle on site:

Charger-free deployment — the unit carries its own 215 kWh battery and drives directly to any depleted vehicle.

80 kW DC output — supports mainstream EV fast-charging protocols; bringing a vehicle back to a healthy range typically takes 15–30 minutes.

State-of-charge strategy — stored vehicles are held at 50–70% SOC, a range widely regarded as appropriate for both NMC and LFP chemistries. It avoids the irreversible damage caused by very low charge (copper dissolution, SEI growth) while preventing the calendar ageing that full-charge storage accelerates.

One unit, multiple vehicles — a single full charge serves several cars, at a fraction of the cost of towing plus external charging.

The cooperation

Under a long-term charging-service agreement, the mobile unit is stationed at the yard on a regular, on-demand basis. It moves between parking bays to jump-start vehicles that have gone flat, and gives inventory cars periodic shallow charges to hold them in the healthy range — removing the risk of a flat battery becoming a write-off.

An in-house energy management system monitors voltage and current throughout each charge and controls the charge rate precisely, preventing overcharge damage while balancing speed and cell safety.

Where it applies

HQESS continues to serve emergency mobile charging needs across industrial parks, logistics hubs and large parking facilities, replacing fixed-charger construction with a lightweight model that needs no infrastructure, can be scheduled flexibly and responds around the clock.