Essence Electric
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Do block heater poles work for electric plug-in vehicles?
In cold weather climates, electric poles are commonly found in parking lots so that people can plug in their block heaters. When electric plug-in vehicles become more popular, can you plug into the same outlets to charge your vehicle? So in essence, you could recharge your vehicle every day at work rather than using your own electricity at home. Feasible?
The answer to your question is a matter of current draw for the device and what is available from the outlets.
One example of a block heater says that the "element is 600W and uses 120VAC."1 by way of comparison many desktop computers come with a 400 watt power supply. One rule of thumb is that you want your constant wiring load to be no more than 75% of the rated capacity of the wiring. Practically speaking you might have one 20 amp breaker (2400 watts at 120 volts) for every 3 outlets. It is unlikely that you would have one breaker for each outlet. But it is possible. You might even have up to 13 outlets for one breaker. 2
The charger for an electric vehicle is likely to have a higher draw. One site(3) lists a range of chargers (you would have to have installed onboard) as having a draw from 1.6kw (1600 watts or about 13 amps to a low of 500 watts and therefore slightly less then the expample of the block heater.
So it is possible but you would either have to have a low wattage charger to be sure you would not blow a fuse. Now how much of the battery capacity you might be able to fill is entirely another question. It would depend upon the size of the battery pack.
One battery pack capacity for a home built electrical powered van is listed at 20kwh. The van is equiped with a solar cell and a wind turbine that together can produce 600 watts at peak capacity. The owner says this would take a day to top off the batteries.4
The figures here make a lot of assumptions that would need to be verrified under actual conditions. For example it is unlikely that this much power would be constantly being provided to a parking lot full of cars.
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