Bob, I think the comparison of dump pack versus roof mounted option was comparing a house mounted solar+dump solution to a *car*roof mounted solar panel, which is easy to beat in financial terms due to the cost of flexible solar for car roof and the unreliable insolation on a car. Other attempts at this have constructed car charging car ports to get increased efficiency from solar panels other than on the car itself.
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Robert Bruninga via EV Sent: Tuesday, September 22, 2015 12:13 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Light-weight 100W PV roof panel for 48V e-carts> ?Is it worth it? -----Original Message----- >> That's 1% to 4%. Better than most banks. And FAR better for the >> future since it displaces X amount of coal burning. > I'll bet a cup of coffee that stationary panels going to a set of batteries used as a dump pack for the golf cart would still financially outperform the roof-mounted option. When Can I collect the cup? Only if the Golf Cart and dump-pack are FULLY discharged every day. Because only then are you using the solar panels. A solar panel just sitting there in the sun connected to a fully charged battery is providing ZERO return on investment. That is why NET metering is the best economics hands down. You get 100% of the energy all the time, every day, no matter how much you use. People forget that battery systems are not only very inefficient, require maintenqance, but whenever they are fully charged, then the solar panels are providing nothing in return for their investment. And since battery systems have to have oversized solar panels to make up for cloudy days, then by definition, every fully sun day, then all the excess solar energy beyond full charge is simply wasted. My conclusion is that any use of batteries for storing solar energy wastes $2 of every $3 invested in the solar system. Grid-tie wastes none of it. You get full retail value for every watt that falls on the panels no matter where you use it. Bob, WB4APR You can use cheaper panels that get maximum insolation, and the only concern for the dump pack is total lifetime cost per kWh in and out -- weight or volume or similar concerns are irrelevant. A significant fraction of the electric vehicles on the road are already solar powered; EV owners are statistically much more likely to have rooftop solar generation than others. Except as a gimmick or an engineering challenge or in unreal fringe cases (extraterrestrial planetary exploration), carting the panels around with you is the most over-the-top wasteful way to get to a "green" car. It's pure conspicuous consumerism --which is perfectly fine if you can afford and appreciate the luxury...just don't pretend that it's saving the planet or that it makes good financial sense. b& _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
