[RE-wrenches] AC V DC RE: electrolysis

[Kirk Herander]

Hi,

There are several different ways to accomplish this via RF signalling.

One discussed before here is to use the IO-WRP kit from supplyhouse.com. I
did exactly what you want (disconnecting an inverter feed remotely when the
generator started) using this kit and  relay / contactor.

And check out offerings at https://www.rfsolutions.co.uk/. I just set up a
wireless genny start / stop from the dry contact of a Fortress Envy, with
one of their xmitter (Bogeyboard) and receiver (Quanta) pairs. @ about 1/2
the price of the IO-WRP setup.

The Rfsolutions stuff is quite versatile, just about anything can be told
to turn on or off, based on one or more 0v inputs. A wide variety of
function inventory to choose from.

A found the products I needed in stock at Digikey and Mouser, respectively.

On Thu, Jun 20, 2024 at 2:35 AM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Friends:
>
>
>
> I have an installation of 12 Enphase IQ inverters that is downstream from
> a generator transfer switch.  During power outages the generator will run
> poorly when the Enphase is on and the sun is shining.  The problems go away
> when the Enphase is shut off.  No surprises about this.
>
>
>
> The Enphase is installed on a barn about 150 conduit feet from the
> generator transfer switch.  My plan is to create a low voltage signal when
> the generator is running and send it to a coil on a contactor in the barn.
> Said contactor will disconnect the 12 micro-inverters.
>
>
>
> There is existing one 26 AWG pairs of a Cat 6 cable running between the
> buildings.  I have found a two pole, 30A contactor that draws 7 watts on
> the coil.  The voltage drop calcs on 150 feet of 26 AWG wire shows a 24
> volt signal will not cause excessive voltage drop (~4%).
>
>
>
> Here is where I am uncertain:  Should I run 24 volts AC or DC?  My concern
> about DC is if there are any damp connections, electrolysis will occur that
> might erode the 26 AWG conductors.  We’ve all seen powder where copper used
> to be.  Is AC less susceptible to electrolysis?  My research has turned up
> no pertinent conclusions.
>
>
>
> Thanks in advance.
>
>
>
> William Miller
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
>
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-- 

*Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*

*Owner|Principal, VT Solar, LLC*

*Celebrating our 33st Anniversary 1991-2024!!*

dba Vermont Solar Engineering

802.559.1225
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