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Another way would be to rectify a higher DC voltage down below
(150 volts anyone?), and put a charge controller up top to
regulate it down to your 48 VDC nominal. You'd get the lower
current you're looking for.
bp
<part15sbs{at}gmail{dot}com>
On 11/29/2018 5:52 AM, Chuck McCown
wrote:
Or use a tower ground return and use both of your wires bonded
together. Not a preferred solution. 120 ac is better.
Sent from my iPhone
6x450i=120W
4x450m=320W.
440W.
Round up to 10A@48VDC.
10A will drop 25V over that distance on 14GA wire, so.
Not doable with your existing wire. Even 10AWG is
borderline.
You're either going to have to run multiple wires, or
run AC power up to the top.
I'd probably just put a din rail 10A 48DC power supply
up at the top. Or something like a Meanwell HEP-480-48
which might be safer as far as 'bare wire hazard' goes.
Hey Forrest,
Can I hijack this and get some
questions answered?
I would like to put four 450M’s
on an existing site we have.
500 ft up with 14 Guage DC and
fiber running up it to a NEMA.
We currently push 48Volt
supporting existing 450i gear that will stay up.
My space at the top is limited. I
will have to use your small Sync Injector PRO to
power the new 450Ms.
Can you recommend a power supply
for the bottom to push DC up?
I have some concerns with the
current wire guage supporting the new load plus the
six existing 450i units that are staying.
Thoughts? Ideas?
Tyson Burris, President
Internet Communications
Inc.
739 Commerce Dr.
Franklin, IN 46131
Daytime #
317-738-0320
Cell/Direct #
317-412-1540
Online:
www.surfici.net
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you?
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From: AF <af-boun...@af.afmug.com>
On Behalf Of
Forrest Christian (List Account)
Sent: Wednesday, November 28, 2018 12:29 AM
To: AnimalFarm Microwave Users Group <af@af.afmug.com>
Subject: Re: [AFMUG] Solar Array Voc
Let me see if I can re-phrase
my question:
I'm redesigning a voltage
input circuit for one of the sitemonitor
products - this is for voltage metering, not for
powering the device. One of the common
questions I get asked is 'can I monitor my solar
array voltage'. Currently the answer is usually
'probably not, unless you are certain the Voc is
below 60V, and that one side of the array is
already grounded to common (often isn't for mppt
controllers)'. I'd rather be able to say
something like 'sure, as long as the Voc isn't
over X volts', where X is high enough that it
contains a reasonable subset of the arrays out
there. I don't think supporting 150V arrays is
in the cards (and yes, I know the tristar MMPT
goes up to 150V), since that starts getting in
the range where clearances get hard to do on the
circuit board.
So I guess the question
should be: What voltage would be able to
measure most of the array voltages out there?
Morningstar makes one of the
better charge controllers and the one that
I like has ethernet access built in. It takes
up to 150 V from the
arrays. They also have their new Mega
Controller that will do up to
600 Volts I don't know of any WISPs that are
using it. We have sites
that we have 2x Morningstars feeding our battery
sets...
Robert
On 11/27/18 5:07 PM, Forrest Christian (List
Account) wrote:
> Looking at determining the maximum
reasonable voltage range for a new
> product I'm working on.
>
> I'm wanting to include a reasonable input
for measuring solar panel
> voltage (a common request). For those who
are running solar arrays to
> charge a DC site (not grid-connected), I'm
wondering what type of array
> voltages you're running. I'd prefer the
Voc figure since that is worst
> case, but even the nameplate voltage (i.e.
multiples of 12V) would be
> useful since I can kinda infer the Voc from
that.
>
> I suspect some of you are running rather
high voltages (>100Voc) on your
> arrays, not sure If I'm going to be able to
measure that high, but would
> like to get a feel for what the reality is.
>
> --
> *Forrest Christian* /CEO//, PacketFlux
Technologies, Inc./
> Tel: 406-449-3345 | Address: 3577
Countryside Road, Helena, MT 59602
> forre...@imach.com
<mailto:forre...@imach.com>
|
> http://www.packetflux.com
<http://www.packetflux.com/>
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>
>
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