Re: [EVDL] Solar PV was: Dirt to Wheels analysis?
I have found that a solar passive systems works better to heat the EV =
directly then either using power from the onboard power. I also use the =
solar passive on my house which passes the heat directly into the house fro=
m =
the sun which is effected down to a low sun angle of 10 degrees.
This is done by using a window that the glass is design for passing the sun =
heat at a sun angle of 10 to 30 degrees which we get here in the northerner =
country on 21 DEC. Above 30 degrees, the sun rays are then deflected back =
which is the summer position.
You can increase the sun passive energy into a compartment you want to heat =
by opening up the curtains and pulling down a dark green shade. The averag=
e =
btur's gain is about 1150 Btu's for a six hour period from 9.00 am to 3.00 =
pm per one square foot of this material.
I design the solar passive system into my EV by making a tight fitting glas=
s =
hatch back that covers the entire bed of my El Camino. The glass area is 4 =
feet by 6 feet which is 24 square feet which is right over the battery box =
which has a dark blue marine carpet on it. The sides and bottom of the =
battery box is insulated using two layers of Blue Dow Foam.
I drive to the Hill Top Caf=E9 every morning just when the sun breaks the =
horizon and park the EV with this glass panel facing the sun. This battery =
compartment ranges from 65 to 70 F before I leave my house and when park =
outside at 0 F. for about a hour, this compartment temperature will raise t=
o =
about 80 F. when the ambient temperature is about 0 F.
Using this method, I do not have to turn on any heaters during these =
conditions which save a trip from either a REGEN system and/or from the mai=
n =
batteries.
Roland
----- Original Message ----- =
From: "Cor van de Water" <
[email protected]>
To: "Electric Vehicle Discussion List" <
[email protected]>
Sent: Thursday, December 23, 2010 7:37 AM
Subject: Re: [EVDL] Solar PV was: Dirt to Wheels analysis?
I have run my 24V Weller soldering iron from one 24V 108W
panel just for fun and because it was near where I need to
use the iron and the outlet was not.
The most practical problem of carrying panels on the EV
is not the added weight or power conversion - it is easy to
solve that.
What is much harder is to actually place the EV in full sunlight
and I do not mean whether the sun shines or not, because you
cannot influence that, but I mean whether there is a parking
place without shade.
As soon as you go into many dense cities, not only do buildings
and many other things obstruct the sun in the street, but most
available vehicle parking is in an enclosed garage.
I know there are many US cities where a car is never inside,
because there is either on-street or driveway-parking as the
garage is used to store stuff, not cars, but that is not
typical the situation in other countries or even as soon as
you get to higher density such as San Francisco for example.
Regards,
Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email:
[email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM:
[email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130
-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On Behal=
f =
Of Evan Tuer
Sent: Wednesday, December 22, 2010 9:57 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Solar PV was: Dirt to Wheels analysis?
On Wed, Dec 22, 2010 at 4:10 PM, Roger Heuckeroth <
[email protected]> =
wrote:
> How about using an array that has a DC output that matches the DC
> charge voltage voltage of your EV.
> Then you don't have any DC-AC-DC
> conversion losses. Mount the array on top of a carport.
This isn't the most efficient way to do it. You need to match the peak =
power point of the panels, which varies according to solar incidence, =
temperature, etc.
Grid connect inverters have this functionality, so it would be more =
efficient to use one and charge your EV from the AC current, using its =
normal charger.
This is also more convenient since the car will charge in a predictable =
time.
> Then have a
> grid tie inverter that can be switched in when the EV is charged, so
> that the surplus energy is not wasted.
And since you're buying one anyway...
That said, I *have* charged my EV directly from a big solar array, just for =
fun. It worked.
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