Posted by g on April 18, 2011, 4:29 am
On 17/04/2011 20:40, David Nebenzahl wrote:
> It *sounds*--and I'm sure you'll correct me if I'm wrong--as if you're
> agreeing with me, and with Smitty, and others when we say that it is
> *not* required that the photovoltaic inverter supply a higher voltage in
> order to transfer current to the grid. (I take this from the last
> sentence in the next-to-last paragraph, where you say " ... will adapt
> itself to the line voltage, whatever it may be".)
> The arguments against this, with all the pseudo-science being thrown
> around (most of it by the ones who are also slinging insults) are
> getting quite tiresome here.
If you take the voltage drops into account, the voltage at the inverter
has to be higher than the voltage at the grid connection point.
This is a real world scenario.
Posted by Mho on April 18, 2011, 4:21 pm
Sorry, totally incorrect assumption. I guess the real world isn't for you
Load current is shared depending on impedance of parallel source loops.
--------------------
If you take the voltage drops into account, the voltage at the inverter
has to be higher than the voltage at the grid connection point.
This is a real world scenario.
Posted by krw@att.bizzzzzzzzzzzz on April 18, 2011, 11:04 pm
>Sorry, totally incorrect assumption. I guess the real world isn't for you
You're wrong, 'g' is correct. You can't even figure out how to use a
newsreader.
>Load current is shared depending on impedance of parallel source loops.
Word salad.
>--------------------
>If you take the voltage drops into account, the voltage at the inverter
>has to be higher than the voltage at the grid connection point.
>This is a real world scenario.
Posted by Jim Wilkins on April 18, 2011, 11:34 am
> On 4/17/2011 7:19 PM Jim Wilkins spake thus:
> ...>
> It *sounds*--and I'm sure you'll correct me if I'm wrong--as if you're
> agreeing with me, and with Smitty, and others when we say that it is
> *not* required that the photovoltaic inverter supply a higher voltage in
> order to transfer current to the grid. (I take this from the last
> sentence in the next-to-last paragraph, where you say " ... will adapt
> itself to the line voltage, whatever it may be".)
The inverter output is higher -internally- by the V=IR drop between it
and the grid.
In this case I is the independent variable, the array's output, and V
is whatever it takes to make I pass through R to get to the grid
voltage.
jsw
Posted by David Nebenzahl on April 18, 2011, 7:45 pm
On 4/18/2011 4:34 AM Jim Wilkins spake thus:
>
>> On 4/17/2011 7:19 PM Jim Wilkins spake thus:
>>
>> ...
>>
>> It *sounds*--and I'm sure you'll correct me if I'm wrong--as if
>> you're agreeing with me, and with Smitty, and others when we say
>> that it is *not* required that the photovoltaic inverter supply a
>> higher voltage in order to transfer current to the grid. (I take
>> this from the last sentence in the next-to-last paragraph, where
>> you say " ... will adapt itself to the line voltage, whatever it
>> may be".)
>
> The inverter output is higher -internally- by the V=IR drop between it
> and the grid.
>
> In this case I is the independent variable, the array's output, and V
> is whatever it takes to make I pass through R to get to the grid
> voltage.
OK, now we're getting somewhere.
At the risk of igniting another round of sniping here, how does that
work, exactly? I assume you're talking about the voltage drop between
the inverter and the point where it's tied to the external power lines
(= grid), correct? So since it can only "see" its own internal voltage,
how does the inverter even know what that voltage drop is? How does it
regulate its voltage so that it's equal to the grid voltage at the point
of connection?
Or is this somehow self-regulating, where the inverter simply "aims" at
what it calculates is the grid voltage, based on the current delivered
by the PV system, and the voltage self-stabilizes?
Gory details, please.
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> agreeing with me, and with Smitty, and others when we say that it is
> *not* required that the photovoltaic inverter supply a higher voltage in
> order to transfer current to the grid. (I take this from the last
> sentence in the next-to-last paragraph, where you say " ... will adapt
> itself to the line voltage, whatever it may be".)
> The arguments against this, with all the pseudo-science being thrown
> around (most of it by the ones who are also slinging insults) are
> getting quite tiresome here.