EV Charging in Underground Garages
No LAN. No WiFi. No cellular.
EV charging infrastructure for underground garages is different: no network coverage, high cost for LAN cable runs, unreliable WiFi mesh. HeyCharge solves it with patented SecureCharge technology — EV charging in the Tiefgarage via Bluetooth, with asynchronous billing through the app. 100% reliable, even where other systems fail.
Why conventional wallboxes
fail in underground garages
EV charging in underground garages almost always fails for one reason: connectivity.
No cellular in the Tiefgarage
Underground garages are signal dead zones. LTE, 4G, 5G — all blocked by reinforced concrete. Conventional wallboxes with SIM cards can't connect. Authentication and billing fail. Background: EV charging in parking garages without cellular and why charging apps fail in underground garages.
LAN cabling is expensive
Running network cable from the utility room to every parking space — cable trays, switches, patch panels. Installation cost balloons to €200–500 per space just for data lines.
WiFi mesh is unreliable
Mesh WiFi in underground garages sounds like a solution but it's flaky: reinforced concrete, signal reflections, property management fielding support calls at 9 PM when someone can't charge.
Standard wallboxes break down
Without network, no authentication, no billing, no §14a EnWG grid control. The wallbox either refuses to charge — or charges without any record, uncontrolled and unbilled.
SecureCharge: Bluetooth, not LAN
Patented offline technology. The smartphone becomes the network.
Driver opens the app at the car
The HeyCharge app connects via Bluetooth directly to the wallbox — no internet needed. Authentication and charge release happen locally, in milliseconds.
Charging runs offline
The wallbox charges the vehicle and stores usage data in an Eichrecht-compliant manner. No cloud connection at the wallbox. No network, no problem.
Data syncs asynchronously
Once the driver leaves the garage and reconnects, the app uploads usage data to the HeyCharge backend. Billing runs automatically each month.
Legally compliant — even offline
Eichrecht, MID, §14a EnWG — all requirements met. No compromises in the Tiefgarage.
Anywhere the
underground garage is the problem
Residential and commercial properties, hotels, mixed-use — the challenge is the same everywhere.
Multi-family buildings
Residential properties, HOAs (WEGs), property managers — tenants and owners charge in the underground garage.
Learn moreOffice buildings
Employees, company cars, commercial tenants — charging infrastructure for the employee garage.
Learn moreVacation rentals & hotels
Guests charge in the hotel garage — automatic billing onto the room invoice.
Learn moreGet your garage assessed
Free initial consultation: we assess feasibility for your underground garage — grid connection, parking layout, load management, funding.