Take Charge of Your Power
The ultimate mobile companion for off-grid adventurers, RV enthusiasts, and van dwellers. Transform complex power calculations into effortless insights.
Why EZ Watts?
Everything you need to master your power
Stop guessing how long your battery will last. EZ Watts gives you precise, real-time insights with zero complexity.
Power Station Management
Choose from a curated database of popular power stations or create custom profiles for any battery setup.
Real-Time Battery Estimates
Instantly see whether you have a power surplus or a looming deficit as you add devices and usage times.
Efficiency Loss Calculations
Accounts for AC, DC, and USB efficiency losses so your battery projections are more accurate.
Depth of Discharge
Factors in your battery's DoD to protect battery health and give you realistic usable capacity.
Smart Optimization Tips
Get actionable advice to extend your battery life and make the most of your available power.
Intuitive Interface
Beautiful theme-aware design with light and dark mode, easy-to-use sliders, and clear visual feedback.
See It In Action
Watch how EZ Watts works!
A quick look at how EZ Watts helps you monitor, plan, and optimize your power systems.
App Preview
See EZ Watts in action
A beautiful, intuitive interface that makes off-grid power management effortless.
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Power Selector
Find your power station
Device Manager
Add and edit your devices
Dashboard
Manage everything here
Solar Calculator
Plan your solar panel needs
Wire Calculator
Get precise wire sizing
Powerful Tools
A comprehensive suite for energy planning
EZ watts is more than just a battery projection calculator... dive into tools designed to empower every aspect of your offline power setup.
Power Capacity Planner
Plan your entire power system, from battery capacity to inverter and surge requirements, ensuring you have the right gear for every adventure.
Wire Gauge Calculator
Ensure safety and optimal performance with precise wire sizing for both simple hookups and complex DC circuits, factoring in voltage drop.
Solar Capacity Calculator
Determine the solar panel wattage (and battery capacity) you need based on your daily power consumption, sun hours, and system efficiency.
Solar Wiring Calculator
Provides safe wire sizing (and minimum voltage drop recommendations) for DIY solar panel installations - accounting for different voltage and battery chemistries.
Simple Electrical Conversion
Convert between Watt-hours, Amp-hours and Kilowatt-hours for 12v, 24v and 48v.
Advanced Electrical Conversion
Effortlessly convert between Watt-hours, Amp-hours, Kilowatt-hours, and perform advanced conversions for DC, single-phase, and three-phase AC circuits.
About
Meet the Creator
Hi, My name is Ray. I first had the idea for EZ Watts when I was converting a cheap minivan into an off-grid camper. I needed a portable power station and I was having trouble estimating how much power I would need to run different appliances.
Some devices (like 12-volt refrigerators and USB fans) would be on all the time, while others would be used for only a few minutes (like a water kettle or a microwave). So first I created a really simple amps/watts/volts calculator web page. This let me quickly get the numbers for a single appliance - but I couldn't save it and I could only do one device at a time. So the idea for EZ watts 'the mobile app' was born.
I needed to create a mobile app to save all my devices, let me input a specific power station and to do all the calculations for me (and you). That's EZ Watts in a nutshell: make it easier to use appliances off-grid by estimating how long the battery will last when using those devices. I built this app by myself (no team), just me. I know its not perfect so let me know what you think about it and if there are any improvements or other features you'd like to see.
If you're interested in van life or would like to see a video tour of the minivan camper conversion, check it out on YouTube:
Ready to take charge of your power?
Whether you're planning your next off-grid expedition, preparing for emergencies, or optimizing your mobile workspace - EZ Watts provides the clarity and confidence you need.
How It Works
Three simple steps to energy clarity
Add Your Devices
Simply add your devices, specify their wattage and usage time. Choose from presets or create custom entries.
See Your Power Balance
Instantly view your real-time battery balance with accurate runtime estimates factoring in all efficiency losses.
Optimize and Go
Get smart optimization tips, plan your solar and battery setup, and head out with complete confidence.
Get In Touch
We'd love to hear from you
Have a question, found a bug, or want to suggest a feature? Drop us a message and we'll get back to you as soon as possible.
Quick Response
We typically respond within 24-48 hours.
Comprehensive Help
Access our in-app FAQ section and detailed help modals for instant answers.