Fire Department Quick Reference

ThunderBank · Mobile BESS

Lightnin 24/7 Live Tech Consultation

678-472-5682 · 470-244-3905
877-433-0313

Quick Facts

Chemistry

LiFePO4

Capacity

270 kWh

DC Bus

48 V nominal

AC Output

208 V 3φ, 90 kVA

Cert

UL 1741 / 1973 / 9540A*
*or equivalent IEC 62619/62620/UN 38.3 with 9540A pending

Suppression

Built-in (AC panels)

Disconnect & Connection Locations

EMERGENCY STOP	Exterior, rear-right corner. Red/white decal. Latches.
Alternator switch	Cab, left of steering wheel. Kills engine DC charge. Lit = fault, leave OFF.
AC Output	"Waterfall" panel, right side of rear wall. Camlocks G/W/R/Bl/Bk.
AC Input	Exterior, front-right. "Input Only". 3φ vertical, 1φ horizontal.
Internal AC panels	Ceiling, center. Fwd = Input, Rear = Output. Suppression inside.
DC bus bars	Under each of the 3 inverter banks; runs join in the ceiling fwd of AC Input panel. Internal, not field-accessible.
Rooftop solar	~2,900 W. Keeps charging in daylight after EMERGENCY STOP — cover with opaque tarp. Internal breakers (right wall, front, under MPPT) not field-accessible in fire.
External PV breakers	Shielded box, rear-left corner, near ABC extinguisher. 3 breakers for customer solar. Field-accessible — flip OFF.
Display (exterior)	Outside, rear-right, unlocked grey Polycase. Live power + alarms. No need to open the door.
Level 2 EV charger	Black jockey box, front-right. Customer deploys for EV charging.

Personnel door: combo-locked. Call Lightnin for combo or force with axe. Do not open during fire — adds oxygen.

FD Quick Reference · Back

Firefighting Approach

LiFePO4 is water-suitable. Apply copious water for cooling — do not ration. Lower toxicity and lower runaway risk than NMC, but SCBA mandatory (HF gas + organic vapors possible).

On-Arrival Checklist

Confirm EMERGENCY STOP pressed (rear-right corner). If not, press it.
Confirm truck engine OFF + alternator switch OFF (left of steering wheel) — 3rd DC charge path.
Visually check camlock connections at AC In / AC Out for arcing or melting.
Stay-back: 50 ft minimum, 100 ft if venting / flame / audible relief.
Call Lightnin for live consult: 678-472-5682 (backup 470-244-3905, 3rd 877-433-0313). Lightnin can grant the incident commander real-time VRM data (cell temps, voltages, alarms).

Battery Thermal Event

Apply water liberally until cell temps stabilize.
Monitor 24-48 hr post-extinguish for reignition.
Full structural turnout + SCBA.
Contain runoff where practical; notify environmental authorities.

AC Panel Electrical Fire

Built-in suppression may have activated. Confirm EMERGENCY STOP pressed.
Treat as Class C until batteries confirmed not involved.
Suppression activation cannot be directly confirmed. Lightnin can monitor compartment + panel temperature trends in VRM as a proxy.

Residual hazards: ~270 kWh stored at 48 VDC even after EMERGENCY STOP. Batteries isolated but charged. Rooftop solar keeps charging in daylight — cover with opaque tarp to stop. Truck-box panels may be hot — use a thermal-imaging camera before approach. Vehicle hazards remain — truck fuel, engine, tires. A truck-cab fire can spread to the BESS in the box.