[RE-wrenches] 208 V 240 in residential applications

[Bill Brooks]

WK, Marco, and William,

Agreed that 208V versus 240V is not an issue for 240V single phase loads.
Phase angle is not an issue for single phase loads--same reason that a
single-phase inverter can work with 208/240/277V. In the case of the
inverter, typically it is simply a winding count difference for the
different voltages.

Bill.

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Korthof
Sent: Monday, February 10, 2014 7:51 AM
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] 208 V 240 in residential applications

Every residential electric ranges I've ever checked is dual-marked for 208V
and 240V. At 208 volt supply, the resistive elements pull fewer amps, so
with lower amps and volts, you get noticeably less output power (takes and
extra minute to boil a pot of water). But everything still works.

While single family homes are almost always supplied by 120/240 split phase,
there are millions of Multi-family residential homes (condos and apartments)
in the country, and the majority are supplied with 208v three phase power,
with each individual unit getting 2 of three phases plus the neutral. 

Even electric water heaters and most AC compressors that I've checked also
seem to be dual rated (208/240V). Electric car chargers are also agnostic. 



/wk

William Korthof
714.875.3576
Sustainable Solutions
#956904

> 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.
> 
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