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Old 03-22-2014, 08:20 PM   #1
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overvoltage best way to reduce-buck-or?


I have a house in Costa Rica that is supplied by power company with 60 cycle measured voltage of 242-244 but can go as high as 252 volts (5%).
I have 5 installed mini split airconditioners that are only rated for single phase 220-230 volts. they are protected by surge suppressors but I need to reduce the voltage either at the box or at each individual unit. They have sensitive computer boards in them that are known to fry with 240 volts. I am looking for the best way to do this. It is a problem for all houses in the area that use similar a/c units, but power company will not lower voltage without unanimous consent.
I will have an electrician do the work but would like opinions on how to go about this efficiently and cost effective. Buck Boost transformer at box or individual units or some other method? Install a separate box just for the a/c units? There are no other 220 or 230 rated appliances in the house.
Help and thanks.

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Old 03-22-2014, 10:05 PM   #2
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overvoltage best way to reduce-buck-or?


I'd say individual buck/boost transformers would be the easiest solution. The alternative might be a subpanel fed from one buck/boost transformer, but that seems more difficult and probably more expensive.

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Old 03-23-2014, 01:26 AM   #3
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overvoltage best way to reduce-buck-or?


Yes I concurr !

A bucking transformer is probably the easest option !
But make sure it's done properly ! prefered by an electrician,
Who is familuir with the local electrical codes !
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Old 03-23-2014, 07:13 AM   #4
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overvoltage best way to reduce-buck-or?


You can do the buck boost transformer, but remember, if the power company does lower the voltage in the future, you could be under voltage at the AC units, but very unlikely. But just a thought.
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Old 03-23-2014, 08:11 AM   #5
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overvoltage best way to reduce-buck-or?


Most of those ratings have a tolerance of +/- 10%, check with the manufacturer, because you should be fine.
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Old 03-23-2014, 09:15 AM   #6
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overvoltage best way to reduce-buck-or?


Quote:
Originally Posted by k_buz
Most of those ratings have a tolerance of +/- 10%, check with the manufacturer, because you should be fine.

I know every tanning bed I've ever done with a 208v service required a buck boost transformer, and almost every manufacture required this.
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Old 03-23-2014, 09:18 AM   #7
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overvoltage best way to reduce-buck-or?


Quote:
Originally Posted by stickboy1375 View Post
I know every tanning bed I've ever done with a 208v service required a buck boost transformer, and almost every manufacture required this.
Never wired up a tanning bed, but I have wired many CNC machines rated for 220V 3P on 240V 3P as per the manufacturer.

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