GetWattLogic is a free, calculator-driven tool for planning off-grid energy systems. Instead of relying on generic rules of thumb, you build your actual loadout — the devices you run, how many hours a day you run them, your battery chemistry, your regional sun hours — and the calculator returns a matched battery bank capacity, solar panel wattage, inverter size, and generator backup spec. The math is transparent and runs in real time as you adjust your loadout, so you can see exactly how each choice changes the numbers.

It is built for the people who actually live and build off-grid: tiny-home owners, van and RV builders, cabin and hunting-camp owners, remote-work setups, and homesteaders who need honest sizing rather than a one-size marketing chart. It also covers lighter on-grid use cases like plug-in balcony solar, with a separate estimator for payback and legality. A curated gear section and long-form field-note guides round out the tool, so you can move from a sizing estimate to a real, purchasable parts list without a second source.

GetWattLogic is built and maintained by an independent team focused on practical, no-fluff energy education. We do not sell solar hardware, and affiliate links — where present — are disclosed and never change the recommendations or the math. If something here helped you size a build, or if you found a gap, we want to hear about it. Head to the contact page.