Launching today
WattWise
Free solar, battery and electronics calculators
1 follower
Free solar, battery and electronics calculators
1 follower
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.
Hi Product Hunt! I built WattWise because most online calculators for solar, batteries and electronics either hide the maths or bury the answer under ads and sign-up walls.
Every calculator here shows the formula it uses and a worked example, so you can check the result yourself. There are 23 so far, from solar sizing and battery runtime to resistor codes and FPGA clock settings. Results can be shared as a link, and bloggers can embed any calculator for free.
I'd love to hear which calculator you'd want next, and if any result looks off for your setup.