How to persist data average every 5 minutes? [solved]

Setup, Configuration and Use Beginners
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7

thanks that solves the problem! Here the final meteravg.rules

rule "Power average"
when
	Time cron "0 0/5 * * * ?"
	//Time cron "0 * * * * ?" //for debug
then
	var Number PowerAverage = Consumption.averageSince(now().minusMinutes(5)) as Number
	ConsumptionAvg.postUpdate(PowerAverage) // assumes values are still in rrd4j
//	logDebug("consumptionAvg", "Cons average {}", ConsumptionAvg.state)
	PowerAverage = SolarPowerTot.averageSince(now.minusMinutes(5)) as Number
	SolarPowerAvg.postUpdate(PowerAverage) // assumes values are still in rrd4j
//	logDebug("SolarAvg", "Solar average {}",SolarPowerAvg.state)

end

rule "SecPower average"
when
	Item ConsumptionAvg changed or
	Item SolarPowerAvg changed
then
if(SolarPowerAvg.state > ConsumptionAvg.state ) {
	var Number diff = SolarPowerAvg.state as Number - ConsumptionAvg.state as Number
		ImmissionAvg.postUpdate(diff)
		SelfConsumptionAvg.postUpdate(ConsumptionAvg.state as Number)
		FetchEnergyAvg.postUpdate(0)
	}
	else if (SolarPowerAvg.state < ConsumptionAvg.state ) {
		ImmissionAvg.postUpdate(0)
		SelfConsumptionAvg.postUpdate(SolarPowerAvg.state as Number)
		var Number diff = ConsumptionAvg.state as Number - SolarPowerAvg.state as Number
		FetchEnergyAvg.postUpdate(diff)
	}
end

EDIT: I followed the guide on this community for Openhab with InfluxDB+Grafana and I wrote down what i have done to achieve this result in my little blog here. I’m sorry for the Italian in the “article” but i think google translate will make the stuff.
I’ll share this for everyone will face off with my same problems.

Thank again for all the help!

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