mievsolar
Posts: 32
Joined: Wed May 09, 2012 2:58 pm

Solar panel on car - no brainer guys!

Wed May 09, 2012 5:33 pm

Why use the AC and Heating from the main battery pack?

Add two things:

1. A larger accessory battery (the existing one is ONLY about 34 AH? or 408 Watts)
2. A solar panel that covers the whole roof.

By adding a larger accessory battery and run the AC and heater off that battery bank you would NOT compromise on the car range at all. Why should you compromise in the first place? People will use less AC and heat less when they know that they have to choose between range and comfort?

Why have to do that at all? WIth an added solar panel and a larger accessory battery they may be no need to run those systems off the main battery pack that will shorten your driving range.

fjpod
Posts: 529
Joined: Tue Apr 17, 2012 2:31 am
Location: NYC

Re: Solar panel on car - no brainer guys!

Wed May 09, 2012 7:05 pm

bigger battery more weight. PV cells more weight and expense.

JoeS
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Re: Solar panel on car - no brainer guys!

Thu May 10, 2012 8:57 am

Do the math: a panel the size of the cartop would provide maybe a tenth the amount of power that is needed for heating/aircon. For now, about all a rooftop PV panel could be used for is to add a really tiny amount of energy to the battery pack or run a fan or power some other low-power device. Certainly an expensive proposition, not in keeping with our budget-conscious little car.

Given the choice, I'd rather use the deadweight of a battery pack for locomotion instead of personal comfort. The nice thing about the present setup is that I AM given a choice and can be comfortable for the short trips the iMiEV is designed for.

Not a no-brainer.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

fjpod
Posts: 529
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Location: NYC

Re: Solar panel on car - no brainer guys!

Thu May 10, 2012 9:39 am

The iMiev also lets you preheat/cool the car as long as it is plugged in, so sometimes this issues is taken care of. Just too heavy, too little power and too expensive for such a car...and probably any car for the near future.

jray3
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Contact: Website

Re: Solar panel on car - no brainer guys!

Fri May 11, 2012 8:21 am

The only vehicle-integrated solar that I've seen which comes close to costing out both in terms of money and energy balance is the Solar Electric Prius. http://www.solarelectricalvehicles.com/
When last I corresponded with them, the product had not been a commercial success due to the high development costs of building a quality panel that matched the Prius roof curves, and they had no plans for offering one on the newer Prii or Leaf, i-MiEV, etc.. :cry:
2012 i-SE "MR BEAN" 76,000 miles
i-ES traded at 21,648 miles
2000 Honda Odyssey
1987 F250 Diesel
1983 Grumman Kurbwatt,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh
1965 Karmann Ghia Cabriolet

mievsolar
Posts: 32
Joined: Wed May 09, 2012 2:58 pm

Re: Solar panel on car - no brainer guys!

Thu May 17, 2012 10:11 am

Things change quickly in the PV world. I predict that ALL future EV's will have PV roofs.

In fact I just saw a newsfeed where a car running on 100% solar ROOF panel on the car is going around the world. It creates 825 watts and the car can reach a top speed of 60 MPH.

So that car puts EVERY EV to shame. The solar panels is on the roof and looks like the PV array has no problem with the roof curve.

I have contacted company's that makes customer PV thin film arrays but it seems like they really do not want to sell there product as I have not got any return calls...So I will have to try something else. I also want to be able to take the AC and heating off the main battery pack and stick them on a large accessory battery pack and changer the accessary battery pack with solar, but when you plug the charger in it will top off the accessary battery like it doe s now. I can't see that as being to technically difficult, but the difficulty will be getting the wiring diagram and technical help I need.

Don
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Location: Biloxi MS

Re: Solar panel on car - no brainer guys!

Mon Jul 09, 2012 3:03 pm

mievsolar wrote:Why use the AC and Heating from the main battery pack?

Add two things:

1. A larger accessory battery (the existing one is ONLY about 34 AH? or 408 Watts)
2. A solar panel that covers the whole roof.

With an added solar panel and a larger accessory battery they may be no need to run those systems off the main battery pack that will shorten your driving range.
I found the car for you! - Justin Bieber drives a Fisker Karma and it has a complete solar roof. It also has a 20Kw battery pack (which gives it a measly 32 mile all electric range) and it weighs 5300 pounds

Some details on the solar roof - "The Karma includes as standard a solar paneled roof manufactured by Asola Advanced and Automotive Solar Systems GmbH, a Quantum Technologies affiliate, not only to aid in the recharging of its lithium-ion batteries but also to aid the cabin climate control system. The solar roof is capable of generating a half kilowatt-hour a day and is estimated to provide up to 4 to 5 miles (6.4–8.0 km) of additional range a week assuming continuously sunny days"

We can only guess how many thousands this roof added to the cost of the car (it's a $115K car) but if left sitting in full sun for an entire week, it gives you 4 to 5 extra miles of range - VERY expensive miles as it turns out

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1994 Miata 60K miles - Soon to be sold
1979 Honda CBX six into six

Don
Site Moderator
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Location: Biloxi MS

Re: Solar panel on car - no brainer guys!

Tue Jul 10, 2012 7:06 am

Don wrote:We can only guess how many thousands this roof added to the cost of the car (it's a $115K car) but if left sitting in full sun for an entire week, it gives you 4 to 5 extra miles of range - VERY expensive miles as it turns out
A little more research turns up the actual cost. "There is additional value added in design and equipment improvements such as the now-standard integrated solar roof panel, which would have been a $5000 option"

It 'theoretically' can add 4 to 5 miles per week in range, but in actuality, the power generated is mostly used to cool the inside of the car when it's parked out in the sun, so there is little actual battery power gain over a car which doesn't have a solar roof, but is kept out of the sun

Certainly a good looking option (what could look neater on a battery powered car than a roof made up completely of solar panels?) and no doubt functional (after a lunch stop it would be nice to come back to a car which isn't so hot inside) but for $5,000 one has to wonder if the cost is anywhere near worth the benefit? Even if Mitsu could somehow manage to pull off a solar roof for half the $5K cost, I think the extra $2500 would detract from car sales . . . . especially once people saw how little return they were getting for all that money - It would have to be an option, for sure

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1994 Miata 60K miles - Soon to be sold
1979 Honda CBX six into six

NeilBlanchard
Posts: 345
Joined: Tue Jun 19, 2012 11:26 am
Location: Maynard, MA Eaarth
Contact: Website

Re: Solar panel on car - no brainer guys!

Tue Jul 10, 2012 8:34 pm

MUCH better to put a 3-6kW PV system on the roof of your house! Several companies are now offering lease deals with $0 down -- you will pay about half as much as you do now for electricity, and you get to drive "for free".
Sincerely, Neil

http://neilblanchard.blogspot.com/

jaraczs
Posts: 113
Joined: Mon Aug 06, 2012 6:03 pm
Location: Somerset, NJ

Re: Solar panel on car - no brainer guys!

Sat Oct 13, 2012 7:48 pm

I would not dismiss the idea.
It may seem cost prohibitive at present time and when looking at Fisker Karma cost of solar roof ($5000 as per above by Don) and MPGe=52.
However, technology is improving. I have made my calculation based on:
1) pricing of 15.7 sq. feet PV panels at $295 for 205W:
http://www.solarsystemsusa.net/solar-pa ... m/elv-205/
2) area of iMiEV roof = 20 sq. feet
3) solar day = 8 hours
This gives 2.09 kWh per day for $375 (PV only), which in my hands provides 10 miles of range per day, which in turn covers exactly my daily RT commute. So, if we manage to mount PV on the roof at reasonable cost, low weight and hook it up to the battery, this would provide very appealing claim.

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