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| It would be misleading to suggest that all sites can achieve the maximum saving as conditions and loads will vary from site to site. One important fact to remember, it is loads that make the savings, of these those loads that are generally termed “Fixed Impedance Loads” are more susceptible. |
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| Fixed impedance loads are motors, compressors, refrigerators, fluorescent lighting etc but not controlled heating processes. An example of this is a 3kW Kettle rated 230V will requires the same energy input for the water to reach the desired temperature, therefore any reduction in voltage will require the Kettle to be on for longer. However, operate that kettle at 240V and it then consumes 3.27kW and the life of the element is reduced. |
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| Other loads that cannot achieve a saving are variable speed drives, electronic ballast lighting and devices fitted with “Switch Mode Power Supplies”, these are normally found in office equipment, PC etc. A constant power device having a wide input voltage range typically 100V – 260V, reducing the voltage will only increase the current and the savings if any, are negligible. However, in all cases equipment life is extended. |
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| It is generally accepted, that even after taking into account the loads that do not make a saving (discarded loads) it is still more cost effective for a single installation for both of the above methods. |
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| Site surveys are essential to ascertain your loads, site conditions, supply voltages and usage, before any estimate of savings can be given. |
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| E&OE. Powersave technical note 2009/b. Due to continuous improvements Streamline Power and its suppliers reserve the right to change specification without notice. |
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