ELECTRICAL SUPPLY
are always available. There are no start-up issue to worry about, no fossil fuels, no lubricants, and no dirty emissions. While battery systems are replacing sub-1 MW standby applications, especially in a domestic and dense commercial applications, the likelihood of larger hospitals using them to replace SPS is slim. Where we will likely see their introduction is when they are being used to supplement the PES (primary electrical supply) – the hospital’s main supply. Battery storage can be used in conjunction with the PES for peak shaving, reducing the peak electrical loads created by the hospital, and reducing the supply-demand and costs.
A KeorMod modular UPS installation for a hospital.
to the 3-phase low voltage (LV) supply. Another potential drawback is price. Battery systems are much more expensive than a standby generator, including the maintenance cost. Most standby batteries only have a 10-12 year design life, while generators can prove reliable for 20 years or more if well maintained.
The advantage of battery storage is the clean power supply that is always on. Whether inline or in standby mode, they
Additionally, battery storage can be used to supply and work in conjunction with solar in supplementing the PES, and shifting the load demand to a different time period. Until recently, lead-acid batteries (VRLA) have been the ‘go-to’ battery technology for providing stored energy for UPS applications. The high prices and lack of knowledge meant that the superior lithium-ion chemistries seemed out of reach for the budget- constrained healthcare sector. However, with demand going up, and prices coming down, the availability of lithium-ion based UPS systems is on the rise, and progressing toward being a viable option for healthcare.
Graeme Tucker
A director at Power Control, Graeme Tucker has a strong background in UPS installation and maintenance, and has worked within the uninterruptible power supply industry for 25 years, specialising in developing and specifying tertiary power supply solutions for the healthcare industry across the UK and Europe.
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October 2021 Health Estate Journal 67
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