www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You

Order your TDIClub merchandise and help support TDIClub


Go Back   TDIClub Forums > VW TDI Discussion Areas > General Automotive

General Automotive General automotive discussion. This is intended to be a discussion about other not VW and Diesel cars you may have or interested in.

Reply
 
Thread Tools
Old June 23rd, 2019, 21:59   #1
da.hs
Veteran Member
Default EV: off grid solar charger without batteries?

Is an arrangement of this type feasible? Would work daytime only, obviously, but would the variation of available power be a serious problem? Google finds a few articles, nothing definitive.


Background: we have a 56 panel grid tied system built on two 40ft wide steel frames. We can widen these to accommodate 16 more panels and plan to do so this year or next. The connections are in place for this expansion. It still won't supply all the power we use (feeds two houses) but close.



We built a third frame at the start of the project and don't plan to use it. The utility does not currently permit signification expansion of a grid-tied system once built.


One possible use of the spare frame would be a car port with a charger station. Fixed batteries would make it completely uneconomical but if it could work without it might just be worthwhile. Thoughts?


I don't yet have an EV so no particular hurry. WV ID Buzz is the first EV on the horizon that looks seriously interesting - by the time it's in production, there may be a hint of charger infrastructure in this region
da.hs is offline   Reply With Quote
Old June 23rd, 2019, 22:24   #2
JSWTDI09
Veteran Member
 
JSWTDI09's Avatar
 
Join Date: Jan 2009
Location: Las Vegas, Nevada
Default

Quote:
Originally Posted by da.hs View Post
We built a third frame at the start of the project and don't plan to use it. The utility does not currently permit signification expansion of a grid-tied system once built.

One possible use of the spare frame would be a car port with a charger station. Fixed batteries would make it completely uneconomical but if it could work without it might just be worthwhile. Thoughts?

What you suggest is certainly possible. This "spare frame", if populated with panels would generate how much power? You did not mention how many KW your system generates. The 2 big questions would be the KW output of your panels and the size (capacity) of the car's battery. You might want to calculate whether or not a full day's sunlight can generate enough power to fully charge the car's battery. This might be what would make your idea worthwhile - your electric car will be your "fixed battery". Of course you would need to make sure that you give the car's charging system a voltage it can use. The easiest way to do this would probably be a 115 or 220 VAC inverter. I believe that most electric cars can use standard AC power. Some car's may also have DC charging ability (I'm not sure). In either case you will need some kind of "interface" between the panels and the car.



Have Fun!


Don
__________________
2009 Jetta SportWagen TDI (gone but not forgotten)
2018 VW Tiguan SE (I wish it was a TDI)
JSWTDI09 is offline   Reply With Quote
Old June 24th, 2019, 00:02   #3
nwdiver
Veteran Member
 
Join Date: Sep 2015
Location: Eunice
Fuel Economy: 320wh/mi; ~90mpge
Default

I think a good option for you would be SPS from SMA. The new SMA grid-tie inverters have a 'Secure Power Supply' option. You flip a switch and the inverter disconnects from the grid and energizes a 120v outlet up to 2kW or the energy available from the solar array which ever is less.

https://www.youtube.com/watch?v=8cbIwvDzNjo
nwdiver is offline   Reply With Quote
Old June 24th, 2019, 00:32   #4
turbobrick240
Veteran Member
 
turbobrick240's Avatar
 
Join Date: Nov 2014
Location: maine
Default

I would think you'd want/need some amount of additional batteries as a buffer for a completely off-grid charging stall.
turbobrick240 is offline   Reply With Quote
Old June 28th, 2019, 00:22   #5
da.hs
Veteran Member
Default

The panels are 320W max - 28 or 36 per frame => 9KW or 11.8KW
That's max.. we don't quite have Nevada strength sunshine though. Yes, I would assume inverters needed. The existing grid-tied system uses one micro-inverter per two panels.
da.hs is offline   Reply With Quote
Old June 28th, 2019, 03:41   #6
meerschm
Veteran Member
 
meerschm's Avatar
 
Join Date: Apr 2009
Location: Fairfax county VA
Default

The question is a good one, and the inverter maker needs to answer. an added benefit would be your ability to use solar for power in the case of a grid interruption. (say a really bad ice storm that takes out a good chunk of the distribution system for an extended period)


and then the problem is how to make sure the use will stay under the capacity. under varying conditions.



I am not aware of a charging voltage vehicle interface that responds to varying current capacity. the vehicle interface is designed to communicate the capacity, and the vehicle charger limits how much current it uses to stay under this.


if you were to set this up, and have loads close to capacity, then a cloud comes along, the output would drop, and likely the inverters drop off line due to output voltage drop. (would want to verify this protection)
__________________
Mike

Free advice: it is worth what you pay for it. (sometimes)

Last edited by meerschm; June 28th, 2019 at 03:43.
meerschm is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Frostheater/Solar Charger freakwithracket VW MKIV-A4 TDIs (VE and PD) 36 January 5th, 2013 00:57
Solar battery charger caper7 VW MKV-A5 Golf/Jettas 26 April 14th, 2012 05:19
WTB - Solar Charger Ed's TDI Private TDI Items for Sale/Wanted 7 January 10th, 2008 16:14
New VW Solar Charger mainframe TDI 101 4 August 30th, 2002 17:05
Solar Battery Charger LarryLymb TDI Power Enhancements 0 June 21st, 2002 00:58


All times are GMT -7. The time now is 01:21.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.13099 seconds with 13 queries
[Output: 76.66 Kb. compressed to 67.31 Kb. by saving 9.34 Kb. (12.19%)]