Separate charging from operating tools
Recharging cordless-tool batteries creates a different load profile from running corded tools directly. Add the input watts of simultaneous chargers, then estimate their charging hours. Use charger input ratings rather than the cordless tool’s advertised motor power.
For corded tools, include startup surge and the duration of each task. Continuous site lighting can consume more energy across a shift than a powerful tool used briefly.
A shift-based calculation
Suppose two chargers average a combined 200W for three hours and work lights use 60W for eight hours. The delivered energy budget is 600Wh + 480Wh = 1,080Wh. With 85% assumed efficiency and 20% reserve, nominal capacity is about 1,588Wh.
This example excludes direct tool use. Add each tool’s energy and check that peak simultaneous demand stays within the station’s limits.
Check site suitability
Dust, water, vibration and impact protection vary by model. A portable form factor is not proof that a unit is rated for a construction environment. Check the operating conditions, protective devices, extension-cord requirements and your site’s electrical procedures.
Keep the battery clear of cutting debris, sparks and hot materials. Do not charge a damaged tool battery or power station. Use site-approved equipment and a competent electrical professional where required.
Plan the refill window
A station that takes most of the evening to recharge may still work if the next shift begins fully charged. Midday charging depends on an available circuit and the combined input demand of other equipment. Solar recovery may be limited by site shade and dust.
For long-duration high-output work, compare alternative site power arrangements. A larger inverter without more battery capacity can still run out quickly.