Mismatches in readings between the Energy app and other energy measurement apps or data can have multiple causes. Below are the most common reasons for differences in measurements.
The rounding of totals
In some cases other apps may use a different way of roundup up or down numbers. The HomeWizard app rounds up or down based on the closest number including decimals where available. Other apps may use for example a round down to a whole kWh, instead of using decimals.
Difference in time selection
Make sure that the time selections in both the Energy app and the other Apps selection are the same. Some energy suppliers use different selections for months, bases on the start and expiration date of your energy contract. The measurements in Energy are accurate up to a few seconds, this might not be the same for other apps. It could also be that the a local device time is used for logging measurements where deviations of multiple minutes can be normal, where Energy is using Atomic time for high accuracy.
It could be that your other apps are less accurate at measuring, most solar panel inverters have accuracy deviations up to 5%, where Energy has less than 1% on all devices.
Difference between solar panel Apps and P1 meter data
Solar panel converters measure the exact energy production of your solar panels. The HomeWizard P1 meter measures your import and export power from and to the grid.
• Production The power that your solar panels are generating
• Export power The power you are delivering back to the grid excluding the solar production already used in the house (self consumption).
This means that if your solar panels are producing 1000W and your house is still using 500W, the P1 meter will only show you that you are exporting 500W to the power grid.
You can install a HomeWizard Wi-Fi kWh meter on your solar panel group if you want to see the production of your solar panels in the Energy app. You get an additional graph called Power Usage that shows you the total power used in the house.