Off-Grid Planner by Watt & Water
Know your power before you spend.
Plan realistic battery runtime, daily energy usage, and charging balance for boats, vans, and off-grid living. Build setups, add appliances, and see the real daily impact before you buy hardware.
Built by Watt & Water
Independent off-grid planning tool built for practical decisions.
Real narrowboat experience
Designed around real-world electrical tradeoffs, not lab-only theory.
Planning tool used by off-grid owners
Built to help owners sense-check loads, charging, and battery sizing.
What this planner helps you answer
You can quickly test if your current setup is enough, where your biggest energy drains are, and what changes will improve daily balance.
Battery Runtime
See how long your battery bank lasts down to your chosen SOC floor, based on your real appliance profile.
Daily Usage Insights
Break down DC vs AC loads, inverter losses, and top energy consumers so you know what to optimize first.
Charging Reality
Model solar, alternator, and shore input to understand your net day balance.
How it works
Step 1
Set up your system
Enter battery, inverter, charging, and location assumptions.
Step 2
Add your loads
Track real appliances with watts, usage, and duty cycle.
Step 3
Review your report
See runtime, net/day, top loads, and practical next recommendations.
Built for real-world off-grid decisions
This tool is for planning estimates only. Real results vary by battery condition, temperature, wiring losses, and usage behavior.