WattWise

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23 free calculators for home energy and electronics. Size a solar system from your bill, see how long a battery will run, estimate appliance running costs, plan EV charging, or pick a wire size with voltage drop. For makers and engineers: resistor colour codes, LED resistors, voltage dividers, RC filters, 555 timers, PCB trace width, plus FPGA clock, CRC and FIFO tools. Every result shows the formula and a worked example. No sign-up, and any calculator embeds in a blog.

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