I should add that on my setup the ESP8266 only on-sends each pulse as an MQTT message, and all of the counting per time period and extrapolation is done on the RPi3, running openhabian with node-red. I "assume" a similar thing can be setup in domoticz

Another method is instead of timing between the pulses, just count how many pulses per set time period; I use 1 minute for "instant" data, and 10 minutes for more accurate averaged data for storing. At 1000pulses per kW and 1min period, kWh is found by multiplying the count by 0.06; 5 puls...