There are many variables to look out for when sizing an emergency power system for a surgical suite and if it is not thought through properly, it could result in a costly purchase of more power than is needed or too little power. Very often we find a doctor will hire an electrician who simply adds up the total wattage/amperage of all the equipment, total it and base a calculation for running all of it at full load for the required 2 hour run time – when in actuality the real power consumption for a surgical procedure is significantly less. Our Engineers at Medi-Products can help assist you in sizing your power system, here are some factors that are needed to be considered for:


1) Determine The Load:

Consider the equipment that will needed in the event of a power failure during a surgical procedure and list them out. If you are a consultant, architect or an electrician you may need to go over this with the doctor or his/her accreditation consultant. Once you have come up with an equipment list re-review this list and consider which equipment is an absolute must have (generally this is only equipment that pertains to patient safety). You might what to view thephysicians’ specialty page on our website to see what equipment is typically provided provided power to, for each surgical specialty. Calculating in the unnecessary equipment can vastly change the size of the UPS system’s needed capacity and can run up the size and cost of the UPS system quite significantly. You should also think about which equipment will be running simultaneously for example: if you are considering running a surgery table, it may only ever get momentary usage, which is normally while none of the other equipment is on, accounting for this can reduce required KVA or wattage the system needs put out.


2) Determine Run-times per Item.

This variable may have drastic effect on the battery bank size. For example, an electro-cautery unit gets momentary usage throughout the surgery, and within a 2 hour long surgery it might be getting only used 30 of a 120 minute procedure. List out a safe run-time per item to help us get a realistic idea how large your battery bank should be.


3) Power Requirements and Conditioning

It is important to be sure what voltage all your equipment runs at. If there are any 220 volt loads, special provisions may have to be made for this. Additionally some electronic equipment such as C-Arms and lasers will not accept modified sine-wave power and can only run on a pure sine waveform.


All this may seem daunting if you haven’t much experience with measuring electrical energy, but at Medi-Products we are very familiar with medical equipment and what you are required to have.