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Re: [Amps] 3 phase HV transformers on single phase

To: "'Steve Wright'" <>, <>
Subject: Re: [Amps] 3 phase HV transformers on single phase
From: "Doug Ronald" <>
Date: Mon, 31 Oct 2016 12:01:36 -0700
List-post: <">>
Even more - I have 3 transformers hung on the 5200 volt bus. The 48 VDC
battery has a capacity of 1760 AH, so just the transformers alone would
discharge the battery in a month. Of course the 6.6 kW solar array would do
a recharge long before that. I sized the plant to go 5 days with nominal
loads with minimal solar charging in the span. With the early rain this
season, I haven't had a full charge in over a week. I have a 20 kW diesel
generator to charge the battery if this cloudy weather sticks around much

The whole still evolving project was documented here:

-Doug W6DSR

-----Original Message-----
From: Amps [] On Behalf Of Steve Wright
Sent: Saturday, October 29, 2016 11:23 AM
Subject: Re: [Amps] 3 phase HV transformers on single phase

On 29/10/16 10:50, "Doug Ronald" <> wrote:
> [....] I use Collins 208U-10 plate/screen transformers which look very 
> similar to your images, to boost my single phase 240 VAC 60 Hz up to 
> 5200 VAC for transmission from my solar plant to my ranch house, and 
> another run to my shack. The ranch house is about 1/3 mile from the 
> solar plant, and the shack about 800 feet from the solar plant. These 
> Collins transformers are really high quality with ratings from 49 Hz 
> through
> 440 Hz. I see only a 40 Watt loss in each transformer due to I^2R and 
> magnetic effects. One thing to be sure of is to short-out all the 
> windings on the unused leg to prevent the magnetic flux from taking 
> that easy path around the loop. I wouldn't depend on the shorted turn 
> alone to redirect the flux.

How BIG is your solar plant??

80 watts loss 24/7 would need AT LEAST A KILOWATT of solar just to keep the
battery bank up!!!


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