Why is sleep mode important in inverters?
- February 24, 2016
- Posted by: Energiaa
Let us try to understand this by a very recent true story about how Statcon energiaa managed to save over 24000 units of electricity annually using a simple trick.
Our Factory and Office both are supplied round the year via 30KWp each, of solar panels with a 100KVA Hybrid inverter taking on the load. Now a very peculiar problem bothered the D&D team when via remote monitoring it was observed that after the office was shut down, more than 2 KW of load was always seen to be running. Investigations were done at first by asking the guards about the night time load and then shutting off all the MCBs and after about a week of running after this energy ghost, the problem was identified.
The transformer within the Hybrid Inverter, rated at 100KW was the red faced culprit, drawing the load even after the Office hours. Transformers draw some amount of magnetising current even during the NO LOAD condition and a 100 KW Tx will do so in proportion to its rating. This issue is present in all kinds of OFF GRID inverters as well and is a silent contributor to the monthly electricity bill.
Nevertheless the Development department came to the rescue with a SLEEP MODE Feature which is an available technology in all the HYBRID inverters manufactured at Statcon Energiaa. This feature allows the the inverter to be disconnected and in a sleep mode when the GRID is present so that TX draws zero current. When the Grid fails then the inverter takes a delay time of 12 seconds to switch ON and power the loads. This delay is compensated by the fact that night time loads are generally not that crucial to the company’s daily needs and the server if any can always run on a smaller off grid inverter whose cost is paid back by the savings of the Hybrid inverter within 6 months.
2KW for 15 hours straight i.e. from 6 in the evening to 9 the next morning.
Total units for 1 day= 30KWH
For all days throughout the year excluding sundays and third saturdays= 30*292=8,760 units
Sundays and third saturdays= 30*64=1920 Unit
Total units for 1 year= 10680 plus compensating for a few holidays = 12000 Units
Reduction in electricity bill= total units * cost per unit= 12000*8.16= 97920/- Rs.
For two Inverters i.e. Office + Factory= 1,95,840/- Rs.