[RE-wrenches] 208 V 240 in residential applications

[Marco Mangelsdorf]

So is this 3-phase system up and running and providing power to single-phase
(120 to ground) circuits AND split-phase-requiring circuits (240 phase to
phase)?

 

I would think that there would be no problem with the single-phase circuits
(if there are any).  But what about those split-phase circuits getting that
lower voltage 208 volts not @ 180 degrees out of phase but 120 degrees?

 

Sounds like kind of a scary experiment..

 

marco

 

Friends:

 

I feel sort of stupid asking this, but it has never come up for me before:

 

I have inherited an off-grid install gone-wrong.  The system is 208 three
phase with Sunny Boys and Sunny Islands on a mini grid.  It was designed as
three phase.  I presume this was to increase capability with stacked SMA
inverters.

 

Will the household appliances (small cooktop, booster pump, well pump) run
as well on 208 as 240?

 

I always do my research before wasting all of your time.  The web delivered
a lot of "forums" wherein opinions were expressed, but little hard data from
bona fide professionals.  I also did some calculations, see below.  I
downloaded a manual from a random electric range and saw it was specified as
240 or 208.

 


Watts

4000

 


 

 

 


Volts

240

208


Amps

16.67

19.23


% Difference in amps

13.33%

 

 

I am fairly comfortable that this is not an issue, but would like some
confirmation.  Thanks in advance.

 

William

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