Please give us feedback about what other information to include in this FAQ page. 

Why do I see energy fluctuations while not moving? You can see some initial fluctuations when you use the app while remaining stationary. This is expected. Fluctuations will go away right after your vehicle moves a meaningful distance. Energy values will converge to real kWh amounts your vehicle consumes.

How does Watts App calculate energy consumption? Watts App calculates energy fluctuations during acceleration, breaking, hill climbing, cruising and going downhill. It uses your mobile's sensors along with vehicle attributes, This enables the app to calculate real-time energy consumption for both fossil fuel-driven and electric vehicles. Fossil fuel's real energy content and ICE energy conversion efficiencies are taken into consideration. Conventional fuel consumption equivalents are calculeted established energy content values. You can find info about these at epa.gov website or other sources.

What happens when I select a Reference Vehicle? You will be simulating that vehicle's energy behaviour. You will know what energy consumption and cost would be, if you were riding on that vehicle. Watts App will make all energy calculations using that vehicle's parameters, even including its own battery capacity.

How do I define my vehicle’s attributes in the app? Navigate to the settings screen where you can input details like your vehicle’s weight, body, engine type, and the type of fossil fuel it uses. You can find weight of your car in its manual and approximate CdA value based on the size and geometry of your car. ICE engine efficiencies are different for gasoline and diesel cars and Watts App accounts for this. 

Isn't it simpler just to compare average consumption of EV's? No. Since driving styles and route conditions differ wildly, average consumption figures simply do not work well. Watts App does not use average energy consumption values. Instead, using special algorithms, Watts App makes its own calculations based on real time driving conditions.

Do I have to be the driver to use Watts App? Absolutely not. You can use the app while just riding in the vehicle. In fact, this would even be better than being the driver since it would be both safer and much easier to examine energy fluctuations during various route and driving conditions in real time.

Why is the fossil fuel consumption always higher than the electric vehicle’s consumption? Internal combustion engines, which use fossil fuels, have a theoretical maximum efficiency of 50% due to thermodynamics. They often operate at even lower efficiencies in real-world conditions. In addition, electric vehicles can gain back some of the spent energy during braking or going downhill. This is called "Regeneration". Watts App detects these conditions and displays the energy flow direction at any moment while you drive. It calculates amount of regeneration that would happen in an electric car.

Can the app calculate the cost of my trips based on fuel or energy prices? Yes, if you enter the current prices for fossil fuel and electric vehicle charging in your area, the app will compute the estimated cost for each journey, offering a comparison between fossil fuel and electric energy costs.

Can I track multiple trips with the app? You can start and end trip energy calculations using the on-screen button. The app saves a summary of each trip’s data separately for your review.

What if I don’t know the exact weight or type of my vehicle? It’s best to provide the details for more precise calculations. You may refer to your vehicle’s manual or look up its specifications online. However, you might as well use approximate figures, and the EV and conventional fuel comparison will still hold since same parameters are used for both cases.

Does the app share my location data? No. Your location data, accessed from the device’s sensors, remains on your device and isn’t transferred outside for the app’s operations.

Is there a version of Watts App without ads? Not yet, but it is in the making. Please rate Watts App and give feedback to let us know what features you would like in upcoming versions.