Mauileaves
Posts: 7
Joined: Tue Nov 25, 2014 12:33 pm
Delivery Date: 25 Nov 2012

Silly idea?

Wed Jun 24, 2015 12:07 am

Ok solar tech people, what would I need to make a little solar carport? Only for leaf charging. Not to concerned with impressive charging numbers, half the reason is to get my black Leaf out of the sun all day at work.
2012 Leaf with 26k on lease.
2015 Leaf with 200 miles on lease.
7KW of solar panels tied to grid.

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DaveEV
Posts: 6246
Joined: Fri Apr 23, 2010 3:51 pm
Location: San Diego

Re: Silly idea?

Wed Jun 24, 2015 12:15 am

Grid tied or standalone?

Slow1
Posts: 487
Joined: Fri Jul 11, 2014 3:15 pm
Delivery Date: 28 Jun 2014
Leaf Number: 425010
Location: Eastern MA, USA

Re: Silly idea?

Wed Jun 24, 2015 6:42 am

Not silly at all - a carport (if located in good location) could well provide a convenient surface to install solar panels.

IMO the best approach would be to build it grid-tied. If you go standalone you either only use power when car is there to charge (wasting potential energy collection) or pay a premium to have batteries in place as well to save power generated when car is not there.

Rest of the job isn't really complex. Assuming you have an appropriate location with good solar access you just build the car-port with the weight of the panels in consideration, install panels and grid-tie as normal. Install EVSE (outdoor type) and you are all set. Being grid-tied your rate of charge won't be limited by the panels, and you just might be able to break-even on power usage over long term averages.

There is a company who has created a turn-key system that is a parking spot with battery and panels - can be trucked around. Cost on that unit is out of reach of most of us (and doesn't make sense in terms of cost of power harvested over the lifetime of the unit).
2013 S with 6kw upgrade (Black)
MFD Date 12/13

HighDesertDriver
Posts: 454
Joined: Thu Jun 30, 2011 7:29 am
Delivery Date: 09 Sep 2011
Leaf Number: 8765
Location: Palmdale, CA

Re: Silly idea?

Wed Jun 24, 2015 8:36 am

Mauileaves wrote:Ok solar tech people, what would I need to make a little solar carport? Only for leaf charging. Not to concerned with impressive charging numbers, half the reason is to get my black Leaf out of the sun all day at work.
With a system already on your home, it may be possible to increase power by adding panels even with a 7000W inverter already. If not, the orientation of your carport should have the roof sloping south with minimal shade. As the previous commenter said, size the port for roof and panel weight, making sure it accommodates the largest intended vehicle. Consider Enphase micro inverters for ease of construction, accommodation of shading, and claiming all power above 7000W. Please note that we have 7200W hooked up to our original 6000W inverter, but lose very little power due to sun angle, clouds, and desert temperatures. Of course, your mileage will vary. It will help if you update your info to include location beyond the implied "Maui."
2011 Glacier Pearl SL QC
Manf: 8/11 Delivered: 9/9/11
58,900 miles 10/09/15; New 2015 Bat 6/00/15, 55558; 66.14AHr
1BC 6/22/13@28310; 2BC 3/23/14@39750; 3BC 9/30/14@46,292; 4CB 6/12/15@55175, 170-185 G; 43.27AHr
PV: 7.2kW, ~13,500 kWh/yr since 3/06

ishiyakazuo
Posts: 333
Joined: Sat Mar 21, 2015 5:59 pm
Delivery Date: 20 Mar 2015
Location: Chicagoland, USA

Re: Silly idea?

Wed Jun 24, 2015 8:59 am

You mean like this?
http://www.wired.com/2014/10/envision-solar-ev-charger/" onclick="window.open(this.href);return false;
2012 LEAF SL in Cayenne Red
40 mile R/T commute in Chicagoland
Leaf Spy Lite (June 2015, 22513 miles): AHr = 56.86, SOH = 86%, 393.13V, Hx = 73.55%, 924 L1/L2s, min/avg/max = 4.080 4.097 4.109 (29mV)

Slow1
Posts: 487
Joined: Fri Jul 11, 2014 3:15 pm
Delivery Date: 28 Jun 2014
Leaf Number: 425010
Location: Eastern MA, USA

Re: Silly idea?

Wed Jun 24, 2015 9:07 am

ishiyakazuo wrote:You mean like this?
http://www.wired.com/2014/10/envision-solar-ev-charger/" onclick="window.open(this.href);return false;
Indeed I think that was the system I dug into a few weeks ago. My conclusion is that it has value for companies wanting to make a very visible (and expensive) statement OR perhaps for an off-grid solution. However, I doubt that we'll see these popping up in state parks and forests to allow EV drivers to visit. Would be rather nice to have one at a wilderness trail-head, but who is going to pay $40K to put it there eh?

Certainly not worth that cost for a home solution as I'm assuming OP is looking for... I have to imagine that a grid-tied home built solution would come in well under that budget.
2013 S with 6kw upgrade (Black)
MFD Date 12/13

ishiyakazuo
Posts: 333
Joined: Sat Mar 21, 2015 5:59 pm
Delivery Date: 20 Mar 2015
Location: Chicagoland, USA

Re: Silly idea?

Wed Jun 24, 2015 9:10 am

Slow1 wrote:
ishiyakazuo wrote:You mean like this?
http://www.wired.com/2014/10/envision-solar-ev-charger/" onclick="window.open(this.href);return false;
Indeed I think that was the system I dug into a few weeks ago. My conclusion is that it has value for companies wanting to make a very visible (and expensive) statement OR perhaps for an off-grid solution. However, I doubt that we'll see these popping up in state parks and forests to allow EV drivers to visit. Would be rather nice to have one at a wilderness trail-head, but who is going to pay $40K to put it there eh?

Certainly not worth that cost for a home solution as I'm assuming OP is looking for... I have to imagine that a grid-tied home built solution would come in well under that budget.
Oh yeah, no doubt! I just thought it was worth bringing in, because obviously someone thought it wasn't a silly idea, and went as far as to productize it ;)
2012 LEAF SL in Cayenne Red
40 mile R/T commute in Chicagoland
Leaf Spy Lite (June 2015, 22513 miles): AHr = 56.86, SOH = 86%, 393.13V, Hx = 73.55%, 924 L1/L2s, min/avg/max = 4.080 4.097 4.109 (29mV)

Slow1
Posts: 487
Joined: Fri Jul 11, 2014 3:15 pm
Delivery Date: 28 Jun 2014
Leaf Number: 425010
Location: Eastern MA, USA

Re: Silly idea?

Wed Jun 24, 2015 9:26 am

ishiyakazuo wrote: Oh yeah, no doubt! I just thought it was worth bringing in, because obviously someone thought it wasn't a silly idea, and went as far as to productize it ;)
Agreed. The thing I wonder about is if that company would consider building a grid-tied version (skip the batteries) that could perhaps be deployed to condos/apts/homes as a real turn-key solution. I wonder what the price point on that would be and how it would compare to other options.

However, when portability isn't part of the issue, once you build yourself a carport then ask "can I charge via solar" the optimal approach likely is to look at all available roof structures and optimize to get the best solar coverage possible. Certainly keeping in mind the solar goal when building anything could help here... I really like some of the 'solar sheds' I've seen. If/when I put a shed in someplace, a south exposure in full sun will be a consideration in the location/design....
2013 S with 6kw upgrade (Black)
MFD Date 12/13

KillaWhat
Posts: 866
Joined: Thu Feb 23, 2012 5:15 pm
Delivery Date: 15 Mar 2012
Location: Southeast Pennsylvania

Re: Silly idea?

Wed Jun 24, 2015 9:50 am

This is what I built.
If you just eliminated the shed.... you would have a carport.

4000 watts, I charge at 3.3 when I use it.
Works great, plus grid tied.

Did it all myself.
Pretty easy.

Image

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Black SL Delivered 3/14/2012
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Leather Interior
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JUKE 17" Wheel Upgrade w/225-45-17 Michelin MXM4 Tires
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EVDRIVER
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Posts: 6753
Joined: Sat Apr 24, 2010 7:51 am

Re: Silly idea?

Wed Jun 24, 2015 10:04 am

That's a big shadow:)

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