Difference in recorded power between Zwift and Bolt?

[Richard_Pooley2 (Richard)]

Hi,

I have found that Zwift will be recording different power figures to my Wahoo Bolt, but both are being fed power data from the Assioma Duo pedals so I would expect both to be the same. The turbo (Wahoo Kickr V5) was being controlled by the Bolt via Bluetooth. Pedals connected to Zwift by Bluetooth and to the Bolt by ANT+.

I have attached the comparison from the zwiftpower anayliser tool.

The only factor that does differ between the two is the Bolt is reading the ANT+ output from the pedals whilst Zwift on the laptop is using Bluetooth. Zwift does show many more spikes in power where the Bolt doesn’t do this, assumingly because it is working on 3 second averages whereas I presume Zwift is immediate being on bluetooth.

Thoughts welcome.

[Richard_Pooley2 (Richard)]

I’ve just done another session but this time I had the Kickr V5 connected directly with Zwift on the laptop for both metering and resistance control, with the pedals connected to the Wahoo Bolt. I am very surprised how close the two results are after my experience in the above earlier post. See below. Suggests there is limited if any drivetrain losses?! But doesn’t explain why I had different readings when the Bolt was in control of the Turbo and Zwift was just recording, with both running off the same power source (Pedals).