--- title: "Street lighting management and control system | GridBit" description: "Control and monitor street lighting cabinets from one system, with schedules that follow sunrise and sunset, measurements per phase and alarms for every." url: "https://www.gridbit.tech/solutions/street-lighting" language: "en" translation: "https://www.gridbit.tech/bg/solutions/street-lighting" --- # Street lighting management GridBit SLMS puts a street lighting cabinet on the network. You see voltage, current and power per phase, switch the lighting from a map and get an alarm when a branch fails. - Control at cabinet level - Modbus RTU modules on a DIN rail - Keeps the schedule without a connection [Request a quote](https://www.gridbit.tech/contact?product=Street%20lighting) - **street lighting cabinets digitalised**: 5000 + - **municipalities with GridBit SLMS**: 80 + - **partner companies**: 30 + - **years in street lighting**: 15 + The problem ## Most cities cannot see their street lighting A cabinet switches a few streets on and off, and nobody knows what happens inside it until someone reports a dark street. Cities need to see and control the network to deal with: 1. 01 High electricity costs 2. 02 Theft and losses that are hard to find 3. 03 Late information and slow repairs 4. 04 Expensive, inefficient maintenance 5. 05 Targets for lower emissions A street lighting cabinet with GridBit modules of an earlier generation How it works ## From the cabinet to the screen The system works at cabinet level. Compact modules go on the DIN rail of the existing cabinet and talk to each other over Modbus. 01 RTU ### Switches the lighting The control module turns the lighting on and off by sunrise and sunset. It has its own clock with a backup battery, so the schedule holds even when the connection drops. [Open the module](https://www.gridbit.tech/hardware/rtu-4) 02 MCU ### Measures every phase The network analyser reads voltage, current, power, cos φ and energy per phase. The current shows failed luminaires and loads that should not be on the line. [Open the module](https://www.gridbit.tech/hardware/mcu-4) 03 SMU ### Watches the branches The voltage detector checks up to eight outgoing branches. A tripped breaker or a blown fuse shows up as a branch without voltage, by number. [Open the module](https://www.gridbit.tech/hardware/smu-3) 04 GWU ### Connects the cabinet The gateway reads the modules over Modbus RTU and sends the data over the mobile network. One gateway reads up to 127 devices. [Open the module](https://www.gridbit.tech/hardware/gwu-5) 05 WDT ### Restarts what hangs If the electronics stop answering after a surge or a bad supply, the watchdog module restarts them. Nobody drives to the cabinet for a reset. [Open the module](https://www.gridbit.tech/hardware/wdt-1) 06 Platform ### Shows it all in a browser Map, live diagram, alarms, history and reports. No servers to buy: you open the platform on a phone, tablet or laptop. The platform ## What the operator sees ### Every cabinet on one map Plovdiv: 267 cabinets on one map. Markers show the state of each cabinet, clusters open as you zoom in and a filter narrows the map to the cabinets you need. ### One click opens the cabinet Photo, group, the schedule for the day, connection, GSM signal and active alarms. From here you switch the lighting or open the full technical view. ### Remote switching asks for a PIN Turning the lighting on or off from the platform needs a PIN code set by the administrator, so nobody switches a street by mistake. ### The cabinet as a live diagram The single-line diagram of the cabinet with live values: voltage, current and power per phase, the contactor, the breakers and the state of every outgoing branch. ### Live Pulse: a virtual meter for the city Energy for today, the week, the month and the year, the current power and a corridor of normal consumption learned from the last 14 days. ### History for any period Charts of voltage, current, power and cos φ per phase, with the state of the branches and the relay at each moment. Export to Excel. ### Alarm reports with expected and measured values Every alarm per cabinet with start, end, the expected range and the measured value, for example a phase current outside its range. Each cabinet links to the map. ### A log of availability Day by day, which cabinets reported all day, part of the day or not at all, with signal strength and mobile operator. ### An AI helper inside the platform Ask it how to configure something, or to summarise the alarms and logs in plain language. Screens from the installation in Plovdiv. Serial numbers, coordinates and addresses are blurred. Live Pulse ## The load curve tells you what happened at night Street lighting has a simple signature: a step up at dusk, a flat load through the night, a step down at dawn. Live Pulse learns this shape from the last 14 days and draws a corridor around it. A line outside the corridor means something changed: lamps that failed, a branch without voltage or a load that should not be there. Measured power Expected corridor Outside the corridor - A virtual meter for the whole network: today, this week, this month, this year - Share of the time inside the corridor, per day, week, month and year - An alarm when the load leaves the corridor Benefits ## What you get 10 to 15 % energy saved by optimising the schedule 20 to 30 % lower maintenance costs 01 ### Failed luminaires found on time The current of a phase drops when lamps fail. The alarm names the cabinet and the phase. 02 ### Unauthorised connections detected A load that is not lighting shows in the measured current and in the load curve. 03 ### Faults in the supply found quickly Missing voltage on a phase or a branch is visible at once, with the time it started. 04 ### The investment managed after the project Reports and history show what the new lighting consumes and how it behaves, year after year. In the field ## Made for real cabinets ### Recovers by itself The watchdog module restarts the electronics if they hang after a surge or a bad supply. ### Works without a connection When the mobile network is down the lighting keeps its schedule. The clock of the control module has a backup battery. ### No servers to buy The platform runs in the cloud and opens in a browser on a phone, tablet or laptop. ### Thousands of devices The platform receives, checks and shows the state of thousands of devices within seconds. ### One Modbus bus, room for more The modules talk Modbus RTU and one gateway reads up to 127 devices, so a cabinet can carry more than lighting. Options for a project: - Environmental sensors Particulate matter, CO2 or noise on the existing bus, without new cabling. - EV charging Power is already measured, so charging points can be balanced against the load. - Door and vibration sensors For the cabinet door and for the cable network. - Dimming modules Lower light in the small hours for extra savings. For whom ## Who uses it 01 ### Municipalities See where the lighting budget goes and what state the network is in. 02 ### ESCO companies and contractors Measure the savings of a project and manage it after commissioning. 03 ### Maintenance companies Drive out knowing which branch failed and which parts to take. Projects ## Dusk in more than 80 municipalities ADD Bulgaria has worked on street lighting control for more than 15 years. GridBit is its technology brand. - **street lighting cabinets digitalised**: 5000+ - **municipalities with GridBit SLMS**: 80+ - **partner companies**: 30+ - **years in street lighting**: 15+ Municipalities from the project map - Balchik - Dobrich - Sozopol - Pomorie - Devnya - Sungurlare - Yambol - Omurtag - Lyubimets - Ruse - Dimitrovgrad - Dryanovo - Kardzhali - Kirkovo - Svishtov - Pavlikeni - Brezovo - Sopot - Plovdiv - Hisarya - Smolyan - Saedinenie - Stamboliyski - Devin - Pazardzhik - Dospat - Belovo - Sarnitsa - Roman - Miziya - Mezdra - Vratsa - Bansko - Sofia - Montana - Dupnitsa - Pernik - Dragoman Clients ## What clients say > ADD Bulgaria stands out with professionalism, technical competence and correctness in projects for the modernisation of street lighting. We especially value their commitment in the field and their quick reaction to specific requirements. Dimitar Georgiev Member of the Board of Directors, Smart Light > The team of ADD Bulgaria reacts quickly and flexibly to different requirements and challenges. Stoyan Kovachev Project Manager, FILKAB > The GridBit SLMS system has brought real benefits to the municipalities we work with. Vladimir Siromahov General Manager, Lighting Engineering > Thanks to the innovative solutions and the support of ADD Bulgaria, the street lighting systems that were put in place work reliably and contribute to energy efficiency, safety and the modernisation of the urban environment. Kemal Bayryam Managing Director, Efes Energy Translated from Bulgarian. ## Hardware in this system - [Gateway GWU-5 4G LTE gateway for Modbus devices, with Ethernet and MQTT 4G LTE Cat 1 Mobile network, 2G fallback RS485 + Ethernet Modbus RTU and Modbus TCP](https://www.gridbit.tech/hardware/gwu-5) - [Meter MCU-4 Three-phase network analyser with Modbus RTU 3P+N / 1P+N Pole configuration U, I, P, cos φ, E Measured parameters](https://www.gridbit.tech/hardware/mcu-4) - [Relay RTU-4 Astronomical relay with Modbus RTU and energy saving mode Sunrise and sunset Relay schedule 250 VAC Max. relay voltage](https://www.gridbit.tech/hardware/rtu-4) - [Inputs SMU-3 Eight-channel AC voltage detector with Modbus RTU 8 Voltage detection inputs 280 VAC Maximum input voltage](https://www.gridbit.tech/hardware/smu-3) - [Watchdog WDT-1 Watchdog relay that restarts devices when Modbus communication stops Normally open Relay contact 250 VAC Max. relay voltage](https://www.gridbit.tech/hardware/wdt-1) - [Watchdog WDT-4 Modbus watchdog relay, fallback to photo sensor or clock Normally open Relay contact 250 VAC Max. relay voltage](https://www.gridbit.tech/hardware/wdt-4) Questions ## Short answers Another question? [Ask an engineer](https://www.gridbit.tech/contact) ### What is GridBit SLMS? GridBit SLMS is a street lighting management system that works at cabinet level. Modules on the DIN rail of the existing cabinet switch the lighting, measure every phase and watch the outgoing branches. A gateway sends the data over the mobile network, and the platform shows every cabinet on a map with alarms, history and reports. ### Does the lighting keep its schedule when the connection drops? Yes. The control module switches the lighting by sunrise and sunset and has its own clock with a backup battery. When the mobile network is down, the lighting keeps its schedule. ### How does the system find failed luminaires and unauthorised connections? It reads the current of every phase. The current drops when lamps fail, and a load that is not lighting shows in the measured current and in the load curve. Live Pulse learns the normal curve from the last 14 days and raises an alarm when the load leaves that corridor. ### How much does street lighting management save? The figures GridBit works with are 10 to 15 % energy saved by optimising the schedule and 20 to 30 % lower maintenance costs. The reports and the history show what the lighting consumes after the project, year after year. ### Which hardware goes into a cabinet? Five modules on the DIN rail. RTU-4 switches the lighting, MCU-4 measures voltage, current, power, cos φ and energy per phase, SMU-3 watches up to eight outgoing branches, a GWU gateway connects the cabinet and a WDT watchdog relay restarts the electronics if they hang. One gateway reads up to 127 Modbus devices. ### Do we need our own servers? No. The platform runs in the cloud and opens in a browser on a phone, tablet or laptop. ### Where does the system work today? In more than 80 municipalities in Bulgaria, with more than 5 000 street lighting cabinets digitalised. The installation in Plovdiv shows 267 cabinets on one map. ### Can the cabinet carry more than lighting? Yes. The modules share one Modbus bus, so a project can add environmental sensors for particulate matter, CO2 or noise, EV charging balanced against the load, door and vibration sensors, and dimming modules. ## Ask for a street lighting proposal Tell us how many cabinets you have and what is in them. We answer with a configuration and a quote. [Request a quote](https://www.gridbit.tech/contact?product=Street%20lighting) [office@add-bg.com](mailto:office@add-bg.com)