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The current industry standards for Electric Vehicle (EV) charging
stations use either a standard 120Vac or 240Vac feeder. The EV has
its own internal charge regulator unique to the type and voltage of
the battery bank used.<br>
<br>
To my knowledge, here is no EV manufacturer that has a DC charging
circuit connection.<br>
<br>
Charging with DC is technically possible, but you are going to need
a DC-to-DC converter (with its efficiency losses) that also has
charge controller functionality. I don't know anyone that makes such
a device. Plus, if the customer connects the EV to a non-standard
method of charging, he's likely to void the EV's warranty since the
external DC charger/controller would have to mimic the EVs internal
charge regulator.<br>
<br>
A possibility might be a SMA Sunny Island or a Xantrex 4024 with a
minimally sized battery bank. The 240Vac output of the inverter
would be dedicated to the EV charging station function. Sizing of
the battery bank would depend on the current requirements of a fully
discharged EV. The advantage of this approach is that the EV's
internal charger would pull it's power from the sun when it's
shining, and from the grid at night or on cloudy days. The Sunny
Island or the Xantrex can be programmed to only charge from the grid
when the rates are the cheapest.<br>
<br>
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style="font-size: 10pt;">Regards,<br>
<br>
<br>
Gary Willett, PE<br>
<a href="mailto:Gary@IcarusSolarServices.com">Gary@IcarusSolarServices.com</a><o:p></o:p></span></font></p>
</div>
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On 7/14/2011 3:43 PM, Allan Sindelar wrote:
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Wrenches,<br>
I'm stumped as to the best approach for a customer who wants a
non-grid-tied, batteryless PV-powered EV charging station. See
below, from one of our salespeople. Any ideas?<br>
Thank you, <br>
Allan<br>
<br>
-------- Original Message --------<br>
<br>
Allan:<br>
Monday I sit down with an interesting fellow who sounds like a
potential good customer (has money and right enviro goals) - in
SF.<br>
He brought up the idea of discussing a car charging station for
future electric car that:<br>
<ol>
<li>stands alone, no grid connection</li>
<li>no batteries - he pictures his car is home most days - he
parks it and when the sun shines it gets charged directly</li>
</ol>
Why that approach?<br>
<ol>
<li>He is thinking this must be the most efficient conversion,
i.e. directly without batteries or line loss of electrons to
and from utility</li>
<li>Wants the car to function independent of dirty fuel/dirty
electrons</li>
<li>He assumes less equipment; maybe less cost but the cost is
not important other than as example for others</li>
</ol>
Issues I see:<br>
<ol>
<li>All inverters that can produce the high voltage needed need
grid power or if off grid need batteries - know of anything
stand alone available?</li>
<li>Power or voltage fluctuation as panels see more or less sun;
ie hours of day or clouds, etc - what will be the output from
inverter?</li>
<li>Without tieing into grid investment in PVs (both his
financial and the embodied for manuf.) gets wasted when car
fully charged or car not home and sunny.</li>
<li>Is total amps output in peak sun even going to meet the
charging requirements? ie takes 10 days to recharge instead of
4 hours - or overly massive system to match rate of charge?</li>
</ol>
Your thoughts?<br>
Karlis<br>
<br>
<br>
<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"><font
color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font
face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a moz-do-not-send="true"
href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a></span></font>
<span style="font-size: 10pt;"></span>
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