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EV Charging and Lamp Posts

richard64

We have a job wiring lamp post lighting in a private car park.

Somebody has decided that an EV point will be fitted at each lamp post and will supply the light.

When you apply the 3% volt drop for the luminaire, obviously the cable size increases substantially.

Any thoughts?

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    The EV charging load will almost certainly be many times the lighting load. So basically this is an EV charging installation with the addition of a little lighting. 7 kw single phase chargers are pretty much standard unless something faster is specified. 7000 VA charging and perhaps 100 VA lighting. 3 phase 22 kw chargers are another possibility.

    Street lighting equipment is almost certain to be LED these days which is generally fairly tolerant of voltage variations and should be fine with a 5% voltage drop. It might however be a better design to limit the voltage drop to 3% or less on economic grounds. Remember that each 1% of voltage drop represents the loss of 70 watts, for which someone is paying and deriving no benefit.

    Reducing the losses from 5% to 3% will save about 150 watts per charge point during the hours for which it used. 1000 hours use a year is 150 kwh saved per year per charge point. 150 kwh cost about £75 at say 50 pence a unit which is about the going rate for non domestic.

    The size and layout of the cables will depend upon many factors.

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  • 0

    The EV charging load will almost certainly be many times the lighting load. So basically this is an EV charging installation with the addition of a little lighting. 7 kw single phase chargers are pretty much standard unless something faster is specified. 7000 VA charging and perhaps 100 VA lighting. 3 phase 22 kw chargers are another possibility.

    Street lighting equipment is almost certain to be LED these days which is generally fairly tolerant of voltage variations and should be fine with a 5% voltage drop. It might however be a better design to limit the voltage drop to 3% or less on economic grounds. Remember that each 1% of voltage drop represents the loss of 70 watts, for which someone is paying and deriving no benefit.

    Reducing the losses from 5% to 3% will save about 150 watts per charge point during the hours for which it used. 1000 hours use a year is 150 kwh saved per year per charge point. 150 kwh cost about £75 at say 50 pence a unit which is about the going rate for non domestic.

    The size and layout of the cables will depend upon many factors.

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