Total Cost of Ownership

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The initial purchase price of an electromechanical relay or contactor is sometimes two to three times less (or more) than a comparable solid state relay solution. This often influences design engineers and procurement managers to lean towards EMRs when choosing a switching solution for their equipment. In some cases this may very well be the right decision, depending upon the demands of the application. If acoustical noise, shock & vibration, switching speed and current draw of the relay's coil are not a concern, then opting for an electromechanical solution is understandable. However, what is often misunderstood or underestimated is just how much that choice can cost a company over the life of the product in which the relay is used.  

SSR TCO.jpg

The contacts of a mechanical relay have a finite life, which is usually specified within the product's datasheet. A typical economical EMR will have a life expectancy between 100k and 300k operations, with more expensive contactors reaching a life expectancy of one million operations or more. This may seem like a life expectancy sufficient enough to meet the needs of most applications, but how quickly those cycles accumulate over time is commonly understimated, and often by a significant amount. 

Figure 1 depicts the calculated cost of ownership of a solid state relay and electromechanical relay when used in a system with a six month warranty period. In this example, we used $20 for the cost of the EMR and $60 for a comparable solid state relay power controller. We also used $150 as an estimate for the cost of repairing the product under warranty. As can be seen from the chart, the EMR solution is less expensive than a solid state relay solution in applications where the relay switches power to the load fewer than 5x per minute. However, in applications where the relay is subjected to more than five cycles per minute, warranty services can be expected. 

TCO Chart - 6 month warranty.jpg

In figure 2, we calculated the TCO using the same criteria as above but with a twelve month warranty period more commonly seen in the industrial market. In this example, warranty repairs can be expected in applications with operating frequencies as low as two cycles per minute - approximately nine months after the product first goes into service. Even though the initial cost of the solid state relay was more than the EMR, the replacement and warranty costs incurred as a result of the abbreviated life of the EMR cost the company an additional $130 over a twelve month span. Therefore, the total cost of ownership of an EMR in this application was $190, compared to $60 for a solid state relay solution.  

TCO Chart - 12 month warranty.jpg

There are obviously a lot of variables involved in calculating the total cost of ownership of a solid state relay and an EMR. The examples above are meant to give a fundamental understanding of how that cost can drastically change as the number of operations in the system increases. Every application is different and must be evaluated according to its own unique operating conditions, type of load, warranty terms and system cost, along with consideration for any impact on brand image and other corporate objectives. The HBControls TCO Calculator is a tool meant to simply facilitate that evaluation. 

Additional information on the TCO Calculator can be found in the FAQ section below. Please contact our technical team at 800.879.7918 / support@hbcontrols.com, or via our Contact Us page, if you can't find the information you need or if you'd like to discuss your specific application in more detail. 

Frequently asked questions

Is there parking available?


We have free parking at the hotel and keep all guests car keys in the office and shuffle cars around to accommodate free parking for all guests. We move cars to the street and double park cars to accommodate all our guests. If guests do not wish to leave their car keys at the front desk, there is plenty of free street parking.




How is parking throughout Key West?


Parking throughout Key West is difficult. We suggests parking your car and leaving it during your vacation. We are located in downtown so you can easily walk, bike or scooter anywhere with ease.




What time is check-in and check-out?


  • Check-in time is 4:00pm
  • Check-out time is 11:00am – if you just can’t stand to leave Key West and want to check out late – you can pay $75 to stay later in the day and enjoy some more time in sunny Key West.




Where do I check-in?


All guests check in at our lobby at 913 Duval Street. We will give each guest a map to show where your room is located.




What are our reservation & deposit policies? That depends on the type of reservation you are making


  • Regular reservation – a deposit is taken for the first night plus tax. It is completely refundable until 2 weeks before your arrival date. After this time, your deposit is non-refundable
  • Upon check-in – the remaining balance on your reservation is due
  • Advanced Purchase – Reservations made 21 days prior to your arrival date are eligible for the 15% discounted advanced purchase rate. The entire reservation amount is due at time of booking and is non-refundable.




How old do I have to be to make a reservation at Key West Hospitality Inns?


The person making the reservation must be 25 years or older.




Do you allow pets?


Yes! We love all of our furry guests! We have designated rooms that are pet friendly, so please confirm you have a pet friendly room when you make your reservation. There is a $20 per night fee for each pet.




Do you serve a continental breakfast?


  • We serve a lovely continental breakfast around our pool every morning for guests staying at Wicker Guesthouse.
  • Guests at Colors on White and an Island Oasis do not have a continental breakfast included.




How many people can I fit in a room?


This will depend on the room.

  • Rooms with 1 bed can fit up to 3 people in the room. There is only 1 bed, so it you need a 2nd bed in the room, please let the front desk know when making your reservations so we may put a rollaway bed in your room before your arrival. There is a $20 per night fee for a rollaway bed.
  • Rooms with 2 beds can fit up to 5 people in the room. There is only 2 beds, so it you need a 3rd bed in the room, please let the front desk know when making your reservations so we may put a rollaway bed in your room before your arrival. There is a $20 per night fee for a rollaway bed.
  • There is no additional fee for children and cribs.




What’s there to do in Key West?


Our front desk staff is highly knowledgeable and can help you with any type of reservation or adventure you are interested in. At no extra cost! Whether that be, snorkeling, scuba diving, dinner reservations, sunset sails, kayaking and so many more! Check out our Activities page to see the full list.




Can I store my luggage if I arrive before check-in time or after check-out


Yes! You may store you luggage with our front desk staff at any time before or after your stay.




Am I allowed to smoke at the hotel?


All of our rooms are non-smoking rooms. But there are places to smoke outside of your room.