SMD Screen Power Consumption: Electricity Use, UPS and Solar Backup
SMD screen power consumption is the first thing buyers forget to check, and the first thing they notice when the electricity bill arrives. A 6 m² indoor screen that runs 12 hours a day can add about Rs 17,000 a month to a commercial bill. If you are planning to install SMD screens in Pakistan, you need to know the power draw before you sign the quote. This guide shows how much power a screen uses, how to work out monthly units from the spec sheet, and how to size a UPS or solar system so the screen keeps running during load shedding. The tariff figures are current, and the solar numbers come from a real installation we completed. Quick answer: An indoor SMD screen uses about 150 to 200 watts per square metre on average and up to 500 W/m² at full white. An outdoor screen uses about 250 to 350 W/m² on average and up to 900 W/m². At the base commercial rate of Rs 45.43 per unit, a 6 m² indoor screen running 12 hours a day uses about 378 units a month and costs roughly Rs 17,000. How much power does an SMD screen use? Every spec sheet gives two numbers. Maximum power is what the screen draws when every pixel shows full white at full brightness. Average power is what it draws with normal video and images. You will almost never see the maximum in daily use. Published sheets from major brands show the same pattern. On LG’s indoor LED sheets, average draw is about 40 to 45 percent of the maximum. Dark backgrounds and text push the average even lower. Screen type Average draw (W/m²) Peak draw (W/m²) Indoor SMD screen 150 to 200 400 to 500 Outdoor SMD screen 250 to 350 700 to 900 Typical ranges used in our own project planning. Always confirm with the datasheet of the exact screen you buy. Outdoor screens draw more because they run at 5,000 nits or higher to stay visible in sunlight. Indoor screens run at 800 to 1,500 nits. What changes the power draw Brightness setting. Lowering brightness lowers power directly. Many screens are set far brighter than the room needs. White and bright colours use more power than dark backgrounds. Screen size. Power grows with area. Double the area, double the load. The controller, video processor and any cooling fans add to the total. How to calculate SMD screen power consumption You only need the screen area, the average watts per square metre, and the hours it runs each day. Monthly units = (W/m² × area in m² ÷ 1000) × hours per day × 30 Measure the screen. Length times height in metres. One square metre is about 10.76 square feet. Take the average W/m² from the spec sheet. If it is not listed, use the ranges in the table above. Multiply watts per square metre by the area to get total watts. Divide by 1,000 to get kilowatts, then multiply by the hours the screen runs each day. Multiply by 30 for monthly units, then by your rate per unit for the cost. Worked example: 6 m² indoor screen, 12 hours a day Total draw: 6 m² × 175 W/m² = 1,050 W, or 1.05 kW Daily use: 1.05 kW × 12 hours = 12.6 units Monthly use: 12.6 × 30 = 378 units Monthly cost at Rs 45.43: about Rs 17,170 Add 100 to 150 W for the controller and processor. That small load runs all day, so it counts. LED screen electricity bill: what to expect NEPRA’s base commercial tariff is Rs 45.43 per unit, and general service connections pay Rs 43.17. These are base rates. Fuel adjustments and taxes are added on top, so your real rate is higher. Check the latest rate on your own bill before you budget. Here is what that means for common screen sizes, running 12 hours a day at average draw. The figures use Rs 45.43 and leave out taxes and adjustments. Screen size Type Daily units Monthly units Monthly cost 2 m² (22 sq ft) Indoor 4.2 126 Rs 5,700 6 m² (65 sq ft) Indoor 12.6 378 Rs 17,200 12 m² (129 sq ft) Indoor 25.2 756 Rs 34,300 2 m² (22 sq ft) Outdoor 7.2 216 Rs 9,800 6 m² (65 sq ft) Outdoor 21.6 648 Rs 29,400 12 m² (129 sq ft) Outdoor 43.2 1,296 Rs 58,900 Indoor at 175 W/m² average, outdoor at 300 W/m² average. Commercial rates are mostly flat, so there is no slab relief for heavy use. Simple ways to lower the bill Set brightness by time of day. Night content needs far less brightness than noon. Schedule the screen off when the shop or venue is closed. Use dark backgrounds in your content where the design allows it. Move the daytime load to solar. This is the biggest saving, and the solar section below covers it. UPS for LED screen: size it the right way Power cuts and voltage dips make an SMD screen flicker, restart or shut down in the middle of a campaign. A UPS gives clean power and covers short outages. It is also the first piece of backup most buyers add. The rule is simple: size the UPS for the peak load, and size the battery for the average load. Step 1: Find the peak load Use the peak W/m² from the spec sheet, not the average. For a 6 m² indoor screen: 6 × 450 W/m² = 2,700 W, plus 100 W for the controller, gives 2,800 W. Step 2: Convert watts to VA UPS units are rated in VA, not watts. Divide watts by the power factor. LED power supplies often sit between 0.7 and 0.95, so use 0.8 if the sheet does not say. 2,800 W ÷ 0.8 = 3,500 VA Step 3: Add 20 percent headroom 3,500 VA × 1.2 = 4,200 VA, so choose a 5 kVA UPS An online (double conversion)