Power differences between Zwift and Garmin

I have a Stages left crank power meter and a garmin 530 head unit. When I set up my ride in Zwift I choose the Stages power meter.

While riding the Garmin head unit will display higher watts by 20 - 45 watts from what Zwift is displaying and recording.

Any thoughts why there would be such a difference.

One thing that I can think of is you may have 3 second averaging on for zwift and instantiations for the Garmin.

You can use the Zwift power data analysis tool to look at the data.

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Gerrie - I already had the Garmin head unit on 3 second averaging. The stages power meter is in the left crank. When I pedal the power/force should be the same for both the Garmin and Zwift is my thought. I don’t know how they are getting 2 different reading from the same power meter.
Thanks

Try the analyzer that will help to quantify the difference.

Do you use ANT+ of Bluetooth for Zwift?

I use Bluetooth for Zwift and display it on my Ipad.

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I have an SRM power meter and a garmin 510 and I have the same problem. I use Ant + and configured every 3 seconds in zwift and in the garmin. any solution? regards

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Did anyone ever get an answer on this? I have the same problem with an sram (quark) power meter.

Also have tge same problem, zwift under records my max power by 100w or more regularly, I have used left crank stages and now assioma duo, still the same under recording from zwift, Garmin connect, Strava, and training peaks are all the same numbers just zwift is low.