As you say the use of simulator/VP2 explains it, the simulator driver does not emit ET so it must rely on StdWXCalculate when using the vantage driver it does (in your case) emit ET so it is there for your service.
Regards the order I apologise, I mislead you, you do indeed need to change the order but not by changing the order of the service lines (it will have no effect by itself) but rather moving your service to another service line such that it is processed after StdWXCalculate but before the record is saved to archive by StdArchive, something like this should work (untested): [Engine] [[Services]] # This section specifies the services that should be run. They are # grouped by type, and the order of services within each group # determines the order in which the services will be run. prep_services = weewx.engine.StdTimeSynch data_services = , process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate, weewx.engine.StdQC, weewx.wxservices.StdWXCalculate, user.electricity.AddElectricity archive_services = weewx.engine.StdArchive restful_services = weewx.restx.StdStationRegistry, weewx.restx.StdWunderground, weewx.restx.StdPWSweather, weewx.restx.StdCWOP, weewx.restx.StdWOW, weewx.restx.StdAWEKAS report_services = weewx.engine.StdPrint, weewx.engine.StdReport Equally you could add it to the archive_services line before StdArchive, but that is a little misleading in terms of what your service does. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/6c54978f-91bb-4610-8ea3-bcef45b52ee1%40googlegroups.com.