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A voltage divider is always an option. It just requires knowing
the conversion for the particular site.
bp
<part15sbs{at}gmail{dot}com>
On 11/27/2018 9:28 PM, Forrest
Christian (List Account) wrote:
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/>
> <http://www.linkedin.com/in/fwchristian>
> <http://facebook.com/packetflux>
<http://twitter.com/@packetflux>
>
>
>
>
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