A new study by V-Guard Industries has flagged a major but often overlooked factor behind rising electricity bills—low voltage. The research, validated by a NABL-accredited laboratory, shows that sub-optimal voltage can increase air conditioner power consumption by up to 50%, acting as an “efficiency tax” on households. The study examined multiple 1.5-ton AC units from leading brands and found that when voltage drops to 140V–180V—a common occurrence during peak summers—the compressor’s efficiency declines sharply. This forces the AC to run longer to achieve the same cooling, significantly increasing energy usage.
V-Guard Managing Director Mithun K Chittilappilly said many consumers misunderstand “stabilizer-free” appliances. “They can withstand voltage fluctuations, but they are not designed for optimal efficiency under such conditions,” he said, adding that using a stabilizer can cut electricity bills by nearly half. The study highlights that low voltage slows cooling, increases runtime, and causes internal wear and tear, particularly damaging compressors over time.
In Kolkata, where summer demand often strains the power grid, voltage fluctuations are a recurring issue. Industry observers say rising awareness around energy efficiency could drive demand for voltage stabilizers as consumers look to reduce high cooling costs. V-Guard recommends stabilizers like VWR 400 Plus and VWI 400 to ensure consistent voltage, faster cooling, and longer appliance life.