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Author Topic: 277V (AC) charging from 480/277 3-phase service?  (Read 188 times)

tico

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277V (AC) charging from 480/277 3-phase service?
« on: June 06, 2017, 02:36:46 AM »

Hi all,

A bit of an odd question -- are any of the commonly available chargers able to function on 277V service?
 Has anyone done so?
Looks like a single phase of 277V@20A = 4.4kW (assuming 80% circuit breaker load and 1.0PF).

-t
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BrianTRice

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Re: 277V (AC) charging from 480/277 3-phase service?
« Reply #1 on: June 06, 2017, 02:40:50 AM »

The DigiNow Supercharger v2 should handle it fine, but you should inquire about a controller customization to make sure the expected voltage range and current settings are defaulted for it.
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tico

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Re: 277V (AC) charging from 480/277 3-phase service?
« Reply #2 on: June 06, 2017, 05:57:11 AM »

Thanks Brian, good to know.

Also, to begin answering myself -- apparently the spec sheet for the Delta-Q chargers specify 85-265VAC input range, so it comes up a wee bit short of 277V. Also, apparently their PF is .99 @120V and .98 @230V, which is pretty nice.
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Erasmo

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Re: 277V (AC) charging from 480/277 3-phase service?
« Reply #3 on: June 06, 2017, 05:08:59 PM »

Wait a moment are those the measured voltages at you outlet?
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hubert

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Re: 277V (AC) charging from 480/277 3-phase service?
« Reply #4 on: June 06, 2017, 06:08:21 PM »

Hello,

Please consider +/- 10% tolerance of the real grid voltage vs. rated voltage.

the upper limit of 265V for many devices is set for a grid voltage of 240V.

If your grid supplies 277V (rated), it means the real voltage can be >300V...
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frodus

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Re: 277V (AC) charging from 480/277 3-phase service?
« Reply #5 on: June 06, 2017, 09:05:26 PM »

Usually this requires a completely range of components on the switching power supply end. 90-240V is one range, then it jumps up to something like 277 up to like 500VAC. SOME power supplies have an ultra wide range, and can go 90-300VAC, but it's rare.

BrianTRice

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Re: 277V (AC) charging from 480/277 3-phase service?
« Reply #6 on: June 07, 2017, 01:02:47 AM »

Excellent points. And on rechecking, I see the Elcon officially rates it for 265V AC input, which means you definitely need to inquire before buying:

http://www.elconchargers.com/catalog/item/9034090/10295140.htm
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Keith

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Re: 277V (AC) charging from 480/277 3-phase service?
« Reply #7 on: June 24, 2017, 10:49:21 PM »

There is a trick for ac voltage reduction that might work for this. Using a 24 volt secondary transformer rated for the 20 amp current, you could buck the voltage down to 253 volts nominal. These transformers are cheap and readily available. The ac phase must be connected the right way to reduce the total voltage by connecting the 24 volt secondary in series with the 277 volt line.
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