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<div>Wrenches</div><div>the VD is 105 VDC into a charge controller, the engineer is looking good at it like it a grid tie running at wide open all the time, he will not listen to sugestions, that's the problem I have</div><div>Jerry</div><div><br></div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:85%;color:#575757">Sent from my Verizon Wireless 4G LTE smartphone</div></div><br><br>-------- Original message --------<br>From: Jarmo.Venalainen@schneider-electric.com <br>Date: 07/27/2015 5:34 AM (GMT-10:00) <br>To: RE-wrenches <re-wrenches@lists.re-wrenches.org> <br>Subject: Re: [RE-wrenches] DC conductor line loss numbers <br><br><font size="2" face="sans-serif">Hi:</font>
<br>
<br><font size="2" face="sans-serif">When deciding on voltage drops and otherwise
working out the design of a solar system, one thing that needs careful
attention is to make sure that the array voltage does not drop below a
level at which the inverter cannot produce full power.</font>
<br>
<br><font size="2" face="sans-serif">This voltage will occur when the inverter
is working at full input current such as a hypothetical 3000 W inverter
which can handle a maximum of 10 Amps of input current to produce its full
rated 3000 Watts (10Amps @ 300 Vdc). </font>
<br>
<br><font size="2" face="sans-serif">At any voltage less than 300 Vdc, the
power will be limited by the maximum 10 Amps. For example at 290
Vdc you get 2.9 kW, 280 Vdc you get 2.8kW, and so on.</font>
<br>
<br><font size="2" face="sans-serif">Even if the inverter can <u>operate</u>
down to 100 Vdc, you don't want to be anywhere near there, especially not
during the midday hours as that will hurt peak power production, a lot.
In this case -0.3% loss for every volt below 300Vdc.</font>
<br>
<br>
<br><img src="cid:_1_0B42BDBC0B42B9BC00558F0288257E8F" id="1438020388758">
<br>
<br><font size="2" face="sans-serif">Identifying this voltage for a particular
inverter may not however be straightforward due to wide variety of wording
used in specifying ratings. Wording such as,</font>
<br>
<br><font size="2" face="sans-serif">1. operating voltage range</font>
<br><font size="2" face="sans-serif">2. full power operating voltage range</font>
<br><font size="2" face="sans-serif">3. MPPT operating voltage range</font>
<br><font size="2" face="sans-serif">4. minimum operating voltage</font>
<br><font size="2" face="sans-serif">5. minimum MPPT operating voltage</font>
<br><font size="2" face="sans-serif">6. rated operating voltage range</font>
<br><font size="2" face="sans-serif">7. Rated MPPT operating voltage range</font>
<br><font size="2" face="sans-serif">8. starting voltage</font>
<br><font size="2" face="sans-serif">9. nominal operating voltage range</font>
<br><font size="2" face="sans-serif">10. maximum input current</font>
<br><font size="2" face="sans-serif">11. minimum input voltage</font>
<br><font size="2" face="sans-serif">12. minimum DC voltage</font>
<br><font size="2" face="sans-serif">13. nominal DC input current</font>
<br><font size="2" face="sans-serif">14. maximum operating DC input current</font>
<br><font size="2" face="sans-serif">15. maximum continuous operating DC
input current</font>
<br><font size="2" face="sans-serif">17.........</font>
<br>
<br>
<br><font size="2" face="sans-serif">When looking for the voltage below which
you don't want go, look for the following:</font>
<br>
<br><font size="2" face="sans-serif">1. The maximum operating input current</font>
<br><font size="2" face="sans-serif">2. The minimum MPPT operating voltage</font>
<br>
<br><font size="2" face="sans-serif">Then make sure the array can produce
at least that much voltage and current when its really hot when the resistance
of all the wires is more than at room temperature.</font>
<br>
<br><font size="2" face="sans-serif">JARMO<br>
</font><font size="3" color="#008000">_____________________________________________________________________________________</font><font size="3">
<br>
</font><font size="1" face="Arial"><b><br>
Jarmo Venalainen</b> | </font><font size="1" color="#008000" face="Arial"><b>
Schneider Electric </b></font><font size="1" face="Arial"><b> | Xantrex
Brand</b> | <b>CANADA</b> | <b>Sales Application
Engineer</b> <b><br>
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| <b>Mobile:</b> +604-505-0291 <b><br>
Email:</b> </font><a href="mailto:jarmo.venalainen@schneider-electric.com"><font size="1" color="blue" face="Arial"><u>jarmo.venalainen@schneider-electric.com</u></font></a><font size="1" face="Arial">
| <b>Site:</b></font><a href="http://www.xantrex.com/" target="_blank"><font size="1" color="blue" face="Arial"><u>
www.Xantrex.com</u></font></a><font size="1" face="Arial"> |
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<td><font size="1" color="#5f5f5f" face="sans-serif">From:</font>
</td><td><font size="1" face="sans-serif">Glenn Burt <glenn.burt@glbcc.com></font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">To:</font>
</td><td><font size="1" face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
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