[RE-wrenches] Step-up/Step-down Transformer question

[drake.chamberlin at redwoodalliance.org]

Another option would be to locate the inverters near the grid and run
the DC at as high a voltage as possible. Have a separate run of wire
for each of the 5 inverters. If you ran the DC at 500 V, an 11.4 kW
inverter would only draw 22.8. A. Use 2/0 AL for a little over 1% VD
at full power. 

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 "RE-wrenches" <re-wrenches at lists.re-wrenches.org>

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Sent:
Mon, 17 Sep 2018 09:42:01 -0700
Subject:
[RE-wrenches] Step-up/Step-down Transformer question

 Wrenches,

We have a PV array situated about 900' from the POI (240V 1PH). We
initially spec'd (5) 11.4kW inverters and the combined output would be
238A. The wire size required for this current over that distance is
cost prohibitive.

A solution was to use a single 50kW 3 phase inverter at the array and
then convert it to 240V... somehow? Is anyone familiar with how to go
about doing this? My thought was to have a step down transformer at
the POI and pull off two legs to get 240V. Is this even a thing?

The other, more expensive option is to use a step up transformer at
the array and a step down at the POI to get us a smaller wire size.

Thanks for any input.

-- 
Loren Ortiz   Commercial PV Designer

    loren at cal-solar.com [1]  (530) 274-3671

  

 [2]
SHOWROOM LOCATED AT: 149 E MAIN ST. GRASS VALLEY, CA 95945
 

Links:
------
[1] mailto:lorenzo at cal-solar.com
[2] http://californiasolarco.com/referral-program/

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