Shelly Plug S power bill calculation

Setup, Configuration and Use Beginners
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1

Hi!

I have two Shelly Plug S, I want to calculate monthly kWh and electric bill, depend of the power usage.
Someone could help me, how can I do that?

power
power1170×1058 78 KB

2

I Found this solution, but not working.

Items:

Switch pcoutlett "Pc outlet" {channel="shelly:shellyplugs:c55b3c:relay#output"}
Number:Power pcoutletpow "Pc [%.1f %unit%]" (powsum) {channel="shelly:shellyplugs:c55b3c:meter#currentWatts"}
Number:Power pcoutpowtotal "Pc [%.1f %unit%]" (powsum2) {channel="shelly:shellyplugs:c55b3c:meter#totalKWH"}
Number cost "Energy cost [%d]"

Rules:

val Energy = 36
rule "Energy cost"
when
    Item pcoutletpow changed 
then
    var Number postUpdate(cost, (pcoutletpow.state as DecimalType * Energy) / 60)
end

Sitemap:

Switch item=pcoutlett label="Pc" icon="poweroutlet"
Text item=pcoutletpow label="Pc" icon="energy"
Text item=pcoutpowtotal label="Pc" icon="energy"
Text item=cost
3

The working rule:

val Number Energy = 36
rule "Energy cost"
when
    Item pcoutletpow changed 
then
    var Number szumma = (pcoutletpow.state as Number / 1000 * 730.5 * Energy)
cost.postUpdate(szumma)
end