Plan smarter.
Live more independently.
Free, practical calculators for off-grid water, solar energy, batteries, inverters, electrical systems and everyday power use. Find the right tool and turn guesswork into a clear plan.
Everything you need to plan your setup.
Choose a topic to reveal the calculators inside. Your options stay on this page until you select a tool.
Describe a task, such as “run my fridge on a battery” or “size a solar array.” Results update as you type.
Instantly filters the calculator lists below.
Select one or more categories to reveal their calculators. Open categories stay open when you return, until you close them or end this browsing session.
Use the arrow keys from the search box to move through results. Press Enter to open the selected calculator, or Escape to return to browsing.
Pick up where you left off on this device.
WaterWater demand, tank capacity and reserve planning1 calculator
Water demand, tank capacity and reserve planning.
Solar PanelsProduction, orientation and panel efficiency7 calculators
Production, orientation and panel efficiency.
Batteries & StorageBattery capacity, charge time and configurations5 calculators
Battery capacity, charge time and configurations.
Inverters & ElectricalInverter requirements and wiring5 calculators
Inverter requirements and wiring.
Power & EnergyUnderstand daily demand and watt-hours3 calculators
Appliance RuntimeFind how long household devices can run6 calculators
Find how long household devices can run.
Generators & BackupPortable power and backup endurance1 calculator
Portable power and backup endurance.
Complete System PlanningBring panels, batteries and demand together4 calculators
Try a simpler search, such as “battery”, “solar” or “runtime”.
Most useful starting points
New to off-grid planning? These tools cover the decisions that affect almost every system.
From your daily needs to a complete system
Calculations work best when you start with consumption before buying equipment.
Measure daily demand
List your loads and hours of use rather than guessing the size of your system.
Calculate energy use ↗Size generation and storage
Compare your solar production with realistic battery capacity and autonomy needs.
Size battery storage ↗Check the full system
Review panel, battery and inverter requirements as parts of one balanced plan.
Plan the whole system ↗Good off-grid planning starts with water, too.
Our new Off-Grid Water Usage & Storage Calculator estimates daily household demand, tank capacity, reserve volume and days of supply. It can also explore rainfall and scheduled refill scenarios using your assumptions.
Built for cabins, RVs, remote homes and practical off-grid projects. Results are planning estimates, not engineering approvals.