This Q and A of the Day from our Technical Expertise area, regarding the electrical load for a marina project, is answered by ECA experts (theme - power):
The Marina: There are 200 berths for boats from 8 to 18m long. Typically, all the boats plug into the shore supply via an inverter when docked to trickle-charge their batteries. Then when aboard, and still on the marina, they will typically run a TV, radio and the lights (via the inverter). However, this would only apply to a maximum of 25% of the boats at any one time (say 50 boats).
In the winter, a fair number of boats (say 30%) run a dehumidifier 24 hours a day. When people stay aboard in the winter, then they might also run an electric fire, but - again - this would only be a small proportion at any one time (say 15%).
Pontoon: Lighting will be around 100 bollard lights, possibly LED.
Amenity block ashore: There will be an amenity block ashore for toilets and showers with lighting, electric heating, electric hand dryers (x6), electric showers (x6), two washing machines and two dryers (occasional use).
Any help on the likely power demand would be greatly appreciated.
Answer: As a simple guide only to give you an indication of the likely power requirement for the craft, it could be in the order of 1.5kVA for craft up to 12m long, 2.5kVA for craft 13m to 25m, and at least 4kVA for craft over 25m.
For the rest of the installation, guidance is provided in Appendix H of Guidance Note 1 Selection and Erection - produced by the IET.
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