I'm new to Zabbix, so please excuse me that this question comes out of mere naivity 
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I query a unit every 30s for power consumtion in Watt. Now would it be possible (I guess with an item of type calculated) to produce a graph that would visualize the costs for the power consumed? Of course this should not just stack up the costs over time but should somehow give an amount for the period of time of which the graph later would be shown. The calculation should also take account of two different power tariffs (a lower tariff from 2am to 6am and a normal tariff from 6am to 2am). How would I do that?
.I query a unit every 30s for power consumtion in Watt. Now would it be possible (I guess with an item of type calculated) to produce a graph that would visualize the costs for the power consumed? Of course this should not just stack up the costs over time but should somehow give an amount for the period of time of which the graph later would be shown. The calculation should also take account of two different power tariffs (a lower tariff from 2am to 6am and a normal tariff from 6am to 2am). How would I do that?