Sizing calculators, honest product comparisons, and step-by-step guides for solar, batteries, water, and everything in between.
Start with the system you're working on
Size panels, controllers & inverters
Lithium vs AGM, sizing & monitoring
Backup power sizing & fuel options
Filtration, wells & rainwater collection
Load calculations & system design
Wood stoves, propane & passive design
Honest comparison of the best inverter generators for off-grid use — noise levels, fuel efficiency, runtime, and which one actually makes sense for backup power.
Complete guide to off-grid water filtration — gravity filters, reverse osmosis, and inline systems for well water, rainwater, and stream sources. Real costs, real limitations.
Calculate the exact battery bank size you need for off-grid solar — with formulas, worked examples, and a clear breakdown of LiFePO4 vs AGM for cabins and homesteads.
Step-by-step guide to calculating exactly how many solar panels, batteries, and controller amps your off-grid cabin needs — with worked examples and common mistakes to avoid.
Honest comparison of LiFePO4 and AGM batteries for off-grid solar — real cost over 10 years, weight, cold-weather performance, and which one to buy for your situation.
Every guide shows the math. No vague advice — only specific sizing calculations you can act on.
We tell you the real trade-offs between products, including the downsides other sites skip.
Interactive tools for solar, battery, generator, and water system sizing — always free.