Kilowatt Matrix

Kilowatt Matrix is an offline toolkit built for DIY solar builders, van-lifers, and backup power enthusiasts designing off-grid battery systems. Every calculator runs entirely on your device — no internet connection needed, ever.

Whether you're wiring a battery bank for a camper van, sizing cable runs for a solar array, or figuring out how long your fridge will run before your battery hits its safe discharge limit, Kilowatt Matrix gives you fast, precise answers on the spot — even with zero signal.

FOUR ESSENTIAL TOOLS

⚡ Battery Bank Capacity Aggregator
Model series and parallel battery wiring configurations to instantly calculate your bank's total voltage, amp-hour capacity, and watt-hour energy storage. See your configuration visualized as you build it.

🔌 Wire Gauge (AWG) Voltage Drop Finder
Pick a wire gauge, enter your current draw and cable run length, and get an exact voltage drop percentage. Know immediately if your wiring is undersized before you install it.

☀️ Solar Array Yield Estimator
Enter your panel wattage, panel count, system efficiency, and daily sun hours to estimate your expected daily energy generation in kWh — plan your array size around your actual power needs.

🔋 Discharge Runtime Profile
Find out exactly how long your battery bank can power a connected load before crossing your battery chemistry's safe depth-of-discharge limit. Get a clear runtime in hours and minutes, not just raw numbers.

WHY KILOWATT MATRIX
100% offline — every calculation runs locally on your device
Zero permissions requested — the app never accesses your camera, location, contacts, or storage
No account, no sign-up, no internet required
No ads, no in-app purchases
Clean, precise interface built for quick reference in the field
Your last-used inputs are saved automatically so you can pick up where you left off
Light and dark themes, with automatic system matching


WHO IT'S FOR
Kilowatt Matrix is built for anyone planning or troubleshooting an off-grid electrical system van conversions, cabins, boats, RVs, backup power setups, and DIY solar installations. If you've ever had to guess at wire gauge sizing or battery runtime with a napkin and a phone calculator, this app replaces that guesswork with exact, repeatable numbers.

PRIVACY FIRST
Kilowatt Matrix collects zero personal data. Nothing you enter ever leaves your device. There is no analytics, no tracking, and no network activity of any kind — the app works identically whether you're online or completely disconnected.

Download Kilowatt Matrix and take the guesswork out of your next off-grid build.

Recent changes:
Welcome to Kilowatt Matrix your offline solar & battery off-grid planning toolkit.
This first release includes:
Battery Bank Capacity Aggregator: model series/parallel battery wiring
Wire Gauge (AWG) Voltage Drop Finder: check your cable runs before you install them
Solar Array Yield Estimator: estimate daily generation from your panel setup
Discharge Runtime Profile: know exactly how long your battery will last