Off-grid power planner
Copper Dusk sizes the battery, inverter, solar array and generator for a house that isn't connected to anything, then shows you hour by hour whether the lights stay on.
A sample cabin. Slide through 24 hours and flip breakers to see the battery respond.
What it does
Pick a fridge, pump or kettle, then run a finger along a 24-hour ribbon to paint the hours it runs. Each gets its own breaker.
Choose a city or type a latitude and see what your roof makes each month beside what the house uses.
Drag the sun across the sky, watch the battery fill and drain, and feel the moment the generator starts.
Every size explains itself: battery capacity, inverter peak, generator hours and yearly fuel.
Drag the plug to set a cable run and get the cross-section, matching breaker and voltage drop.
Lithium or lead-acid? Priced with your quotes over ten years. Builds that leave you dark are never ranked cheapest.
About
🏡 We are a small crew of off-grid dwellers, tinkerers and engineers who have all stared at a dying battery at nine at night.
🎯 Our mission is to turn power planning from guesswork and spreadsheets into something you can see, drag and understand.
🔋 Copper Dusk gives you a right-sized battery, inverter, array, generator and cabling, with the reasoning behind each number and an hour-by-hour preview of your evening.
☀️ Plan the power first. Then build it.
Privacy
Effective Date: October 2026
Nothing. Copper Dusk does not collect any personal or usage data. Your appliances, locations, sunshine figures, quotes and saved builds never leave your device.
Since we collect nothing, we use nothing. The information you enter is used only on your device to calculate battery, inverter, array, generator and cable sizes.
Everything is stored locally on your device. There is no cloud, no server and no backup copy held by us.
The app contains no analytics, advertising, trackers or third-party SDKs, and shares nothing with anyone.
Because your data stays on your device, it is protected by your device's own security. We have no database that could be breached.
We do not knowingly collect information from anyone, including children under 13, in line with COPPA. The app is safe for all ages.
You are in full control. There are no accounts to create. To delete all your data, simply uninstall the app.
If this policy changes, we will update this page and the effective date above. Our commitment to collecting no data will remain.
Questions? Write to privacy@copperduskapp.com.
Contact
👋 Questions, ideas or a tricky cabin to size? We'd love to hear from you. Drop us a line any time.
⏳ We reply within 24–48 hours.