Construction sites rarely have access to a permanent grid connection. Temporary power covers lighting, power tools, welding, concrete work, and site offices. Project durations range from a few weeks to several years. Power demand can vary from 10 kW to over 500 kW depending on the scope.
Common loads include tower cranes at 30 to 100 kW, welding machines at 10 to 50 kW, lighting at 5 to 20 kW, air compressors at 15 to 75 kW, and site offices at 5 to 15 kW. Starting surge for motors and compressors can reach three to five times the running load. This surge must be factored into generator or battery sizing.
Diesel generators range from 5 kVA to over 2000 kVA. They operate most efficiently at 60 to 80 percent load. Fuel consumption is typically 0.25 to 0.35 liters per kWh. Maintenance intervals are usually 250 to 500 hours. Main drawbacks include emissions, noise, and fuel logistics.
A hybrid system pairs a diesel generator with battery storage. The generator runs at its optimal load and charges the battery. The battery handles peak loads. This can cut fuel consumption by 20 to 40 percent. Generator run time is reduced, which extends maintenance intervals.
Lithium iron phosphate batteries are a common choice. They offer 3000 to 6000 cycles. Energy density is 100 to 200 Wh per kg. Systems can be scaled in parallel. They provide instant backup power with no emissions at the point of use.
Solar panels can supplement temporary power. A 10 kW array can produce about 40 to 50 kWh per day depending on location. This reduces daytime fuel consumption. Combined with storage, solar can cover base loads at night.
List all equipment and record rated power. Apply a diversity factor for simultaneous use. Add 20 to 30 percent margin. Check starting surge for large motors. Use data loggers for on-site measurement when possible.
Consider project duration, load profile, fuel access, noise limits, emission rules, and budget. Short projects often favor generators. Long or remote projects benefit from hybrid or storage systems. A load study helps match the source to the actual demand.
INJET HanCang provides temporary power systems for construction sites. Products include diesel generators, battery storage, and hybrid configurations. Systems support parallel operation to match changing loads. The company offers solutions from 5 kW to over 1 MW.
Temporary power planning affects project cost, schedule, and compliance. Matching the load to the right source is key. Hybrid and storage systems offer practical advantages for many sites. INJET HanCang supports contractors in selecting the right configuration.