This means the maximum continuous load should not exceed 80% of 15 amps (12 amps), which equates to roughly 1440 watts. Several factors influence how much load your garden outlet circuit can handle: The gauge (thickness) of wiring affects current capacity. Before installing garden power outlets, it's crucial to understand key electrical concepts related to load capacity: Load: The total electrical demand (in watts or amps) placed on a circuit by connected devices. This guide breaks down capacity ranges, real-world applications, and industry trends—helping you make informed decisions for camping, RV trips, or backup energy needs. HOME / How Much Is the Capacity of an Outdoor. If you check the extension cord wattage charts below, you can see that 16 AWG extension cord can handle 1,430 watts (25-feet and 50-feet cord), 1,100 watts (100-feet cord), and less than 770 watts (150-feet cord). Successfully running electrical power to an outbuilding will require a few tools, some research, and experience. Determine the amps and voltage of each of your workshop's electrical tools. Most tools have a metallic plate or a sticker containing the product electrical requirements and. A s a professional landscape lighting designer looking to install and operate a new low voltage lighting system, you need to consider what transformer will be required to convert your standard line voltage outlets using 110-120V into your outdoor low voltage 12V-15V lighting design.