Page 4 of 6

Re: use of solar panel at spoiler on roof?

Posted: Thu Jun 03, 2010 9:15 am
by LEAFer
daniel wrote:For anything under a month of storage, a charger is unnecessary, and it's probably unneeded for anything under two or three months.

What happens to the LEAF traction battery in 1-2-3 months ? I've heard of Tesla accidents and the car being at salvage yards sitting unattended and ruining the (very expensive) battery. How much discharge is expected for the LEAF if not plugged in ? Is the solar panel (daytime, unobstructed) in any way able to maintain the health of the traction battery ? Is there a long-term "store it" mode in the LEAF (trickle charging while plugged in) ?
(This should probably also go in the "Battery" thread ...)

Re: use of solar panel at spoiler on roof?

Posted: Thu Jun 03, 2010 10:05 am
by Bicster
The solar panel will do nothing at all for the traction battery, but as has been said before, it shouldn't be a problem to store it unplugged for months at a time. I expect the traction battery self-discharge will be fairly low.

There is already at least one thread for this: viewtopic.php?f=16&t=163

Re: use of solar panel at spoiler on roof?

Posted: Fri Jun 18, 2010 1:21 pm
by ruimegas
Hello, I'm from Lisbon in Portugal and we are going to be the first countrie in Europe to get the first Leafs here and I count to be one of the first to put my hands on one. This is the european countrie with more sunlight hours and that's why I've some questions to make on this amazing forum.

I'm not an expert, and I would appreciate that someone could explain me why doesn't worth to fully cover, at least the roof of the Leaf with high performance flexible photovoltaic panel in order to get as much power as possible while beeing outdoor, instead of that little tiny low performance Nissan wants to provide?

I know that some people will say it's going to be too expensive but Nissan could always make it an option right?

As an example, something like the one we can see in the link below:

http://cgi.ebay.es/Flexible-high-effici ... 168wt_1148

I'm sure it could provide even some power to the main battery too and not only fullfill the auxiliary 12v one.

Thank you and once again congratulations for the best forum about the Leaf I ever see. Sorry about my poor english but I'm not a native speaker

All the best with all your Leafs ;)

Re: use of solar panel at spoiler on roof?

Posted: Fri Jun 18, 2010 1:58 pm
by jkirkebo
mitch672 wrote:I would fully expect the Leafs resistive heater, and Air Conditining compresser will run off the HV as well. Pretty much everything else I would expect to run off the 12V system.


I don't quite understand, why would Nissan put a resitive heater in an EV ? If the car already has AC, why not put in a few extra parts and make it a full reversible (inverter-driven) heat pump instead ? The power requirement for heating in winter (which is half the year around here) would drop to less than a third compared to a resistive heater.

I sincerely hope the Tesla Model S will emply a heat pump for cabin heating...

Re: use of solar panel at spoiler on roof?

Posted: Fri Jun 18, 2010 2:13 pm
by Bicster
jkirkebo wrote:I don't quite understand, why would Nissan put a resitive heater in an EV ? If the car already has AC, why not put in a few extra parts and make it a full reversible (inverter-driven) heat pump instead ? The power requirement for heating in winter (which is half the year around here) would drop to less than a third compared to a resistive heater.

I sincerely hope the Tesla Model S will emply a heat pump for cabin heating...


There are other threads about this, no need to cover it again :)

Re: use of solar panel at spoiler on roof?

Posted: Fri Jun 18, 2010 10:16 pm
by garygid
ruim...
Welcome. You English is fine, no problems.
We are pleased that you have made the effort to join us.

Most likely Nissan is putting all of its efforts into getting the EV to work well, and (for this first model) they have very little (no) priority for fancy, not-necessary options.

Re: use of solar panel at spoiler on roof?

Posted: Sat Jun 19, 2010 3:11 pm
by EVDRIVER
ruimegas wrote:Hello, I'm from Lisbon in Portugal and we are going to be the first countrie in Europe to get the first Leafs here and I count to be one of the first to put my hands on one. This is the european countrie with more sunlight hours and that's why I've some questions to make on this amazing forum.

I'm not an expert, and I would appreciate that someone could explain me why doesn't worth to fully cover, at least the roof of the Leaf with high performance flexible photovoltaic panel in order to get as much power as possible while beeing outdoor, instead of that little tiny low performance Nissan wants to provide?

I know that some people will say it's going to be too expensive but Nissan could always make it an option right?

As an example, something like the one we can see in the link below:

http://cgi.ebay.es/Flexible-high-effici ... 168wt_1148

I'm sure it could provide even some power to the main battery too and not only fullfill the auxiliary 12v one.

Thank you and once again congratulations for the best forum about the Leaf I ever see. Sorry about my poor english but I'm not a native speaker

All the best with all your Leafs ;)



It makes no sense from a cost, weight, output benefit. That is the short answer. Solar panels are best placed on the home not the vehicle.

Re: use of solar panel at spoiler on roof?

Posted: Sat Jun 19, 2010 8:14 pm
by garygid
However, if future technology allowed the PV surface to fit the aerodynamics of the car, was low cost, light weight, and highly efficient, having PV on the car could make very good sense.

Just do not park in the shade.

Re: use of solar panel at spoiler on roof?

Posted: Sun Jun 20, 2010 12:17 am
by EVDRIVER
garygid wrote:However, if future technology allowed the PV surface to fit the aerodynamics of the car, was low cost, light weight, and highly efficient, having PV on the car could make very good sense.

Just do not park in the shade.



However, if the Leaf did not have a heavy steel sub frame and was made of composites it would have far better range and performance. And if the motor used super conductors it would be a fraction of the size and weight but none of this is true now. So, solar panels don't make sense except in the future, where all the other problems may be solved and the BP well is plugged and the gulf is clean. An EVSE may even cost $25. However, that is the possible future so the answer to the solar panel question that gets asked a thousand times remains a simple no. Too bad.

Re: use of solar panel at spoiler on roof?

Posted: Sun Jun 20, 2010 9:25 am
by evnow
garygid wrote:Just do not park in the shade.


I'm getting the feeling I'd get generate more power parking underground than on the surface, in Seattle. Surely I can generate more power with all that artificial light ? We are all going to be fighting for the spot closest to the lights :lol: