"Tricia Liu" <[EMAIL PROTECTED]> wrote: > To EV Designers or Producers: > > 1.All the available EV's and Chargers have the same mind-set as the > Gasoline vehicles. > With a nozzle on the side of the car, but most of the chargers are > standing right in front of > each EV's! Drivers have to pull the nozzle toward the sides of the > cars to charge their vehicles!??
Tricia, I have owned at least 3 on-road EVs now, have 2 more projects under way, and driven more than I can remember. One problem we have with EVs is that drivers pull away without remembering to unplug. After years of dealing with broken connectors, shredded cords and damaged outlets, I have reached the following conclusion. The correct location for the charge connector on the vehicle is right behind the driver door. If the driver has to trip over the cord or otherwise entrap themselves in it to enter the vehicle, they will unplug it. I have seen other systems intended to get around this issue, but this is the one that is simple and inexpensive to implement and works virtually every time. The front of the vehicle is probably the worst place to mount an electrical connector. This exposes it to ram-driven rain and other precipitation, and road dust and debris, leading to corrosion and other fouling of the contacts and possibly more physical damage. I understand your thoughts on the subject. That's where I started, too. However, with over 25 years of on-road experience, I have changed my opinion to that stated above. > 2.When we have bulky battery pack on board a vehicle, you have to find > other ways to > charge the battery packs faster! The biggest problem for battery > powered EV 's is the time consuming charging! Toyota RAV4-EV has 30 x > NiMh batteries and that takes 4 hours to charge up! If you divided up > the 30 batteries into 10 portable battery packs! 1)We can charge the > now removable battery packs in 10 separate outlets then it will take > only 24 minutes to charge the battery packs! > Build a wall full of these outlets, insert these portable packs and > pay 1-2 quarters to charge up! And owners can have another set to > replace the low energy pack, leaving the used pack to be charged up > at homes or offices! > 2)You can design the EV's to have a front charger, even your battery > pack may locate in the back of > the car. Divide them into 10 packs. Wire them to have charging > receptacle in the front of the EV's! We can build car ports with > chargers in front of each parking spaces, The EV charger heads have > 10 contact points, when you park your EV's in each parking space! > Flip open the front lid, expose the receptacle to meet the charger! > +/- to +/- After they are tightly connected, turn on the switch to > allow current to flow into the battery packs! Image the wireless > phone receivers, we have to leave them on the charger stands to > recharge? So we can use this multiple contact point chargers to > charge up the divided battery packs. Instead of wiring batteries to > have only one receptacle like the gasoline car with it's gas tank? > We can free ourselves from that concept, but using a more powerful > charger! Cut down the time of recharge from 4 hours to 20-30 > minutes! My original idea to back up the car to allow the battery > pack in the back of vehicles to meet the charger was wrong. Some > drivers could not back up properly, frontal charging is the only > possibility! GEM(NEV) has very good design, but only 25MPH. > Reinvent your battery pack and get a better DC motors. 75-100MPH > and range 150-200Miles, it will be a real car. So, if I understand correctly, you want an electric car that can refuel about as fast as a gasser, and travel nearly as far on a refuelling, but be zero emissions. Probably should be cheaper than a gasser to buy and operate as well. Well, we would all like to reach nirvana, but so far we haven't found it. People can't drive into a target accurately either. Induction (wireless) charging setups have significant efficiency losses. Stick with the power cord and connector. It's cheap, it's simple, it works. Charging speed is typically a function of the available power (usually inadequate unless specialized, dedicated charging stations are being used), and what the battery system can handle without problems, especially during the finishing portion (top 20%) of the charge. Based on our household driving patterns, the ability to drop 200 miles worth of range into the batteries in under an hour is a capability we would use about 4 times a year. I'm not claiming we're typical, but I read stats year after year showing that over 80% of miles driven in private vehicles in North America are driven in urban environments, with each individual trip being 20 miles or less (averaging under 10). There are many multi-vehicle households. In most cases, at least one of those vehicles will be used primarily for commuting and local errand running. For me, that is the initial target market for EVs. Extended range and fast recharging are not requirements for that market, and trying to find an EV that can do everything a gasser can do (except pollute) sets a high bar that will inhibit the acceptance of EVs. Lets get urban EVs on the road first, then focus on the long-haul missions later. DC motors are pretty efficient. Most operate without external cooling. Some use blowers for air cooling. On the other hand, every OEM AC-powered vehicle I have seen yet produces so much waste heat that they require forced circulation liquid cooling, same as internal combustion engines. In my experience, about the only efficiency advantage I see consistently for AC motors is that they implement regenerative braking more easily than series-wound (cheapest configuration) DC motors. I'm sure AC is coming, but for my money DC remains cheaper to install (motor plus controller costs), and remains more efficient (when motor plus controller plus parasitic losses in total are considered). As for the advantages of regen, they are greatly reduced when the driver understands how to drive for energy conservation. If you don't use the brakes much, the opportunity for recouping that energy is greatly diminished. Removable packs create a few issues of their own. Additional purchase cost. Equipment to handle the removal and insertion of the packs. If the packs are not owned, but swapped, the potential for getting a much worse pack than the one you just handed in (damaged, does not hold as much charge, etc). I have come to the conclusion that battery swapping will work only if the service provider owns all of the packs, and the vehicle owner simply pays for pack usage and recharging. > 2.Solar Carports > Because we are building this type of new structures, the DC current can > supply power to these EV chargers. So when you design the chargers, > please allow them both AC and DC operable! Solar array can supply > 24-48VDC to charge up EV's DC battery packs, without converting to AC! Absolutely. The catch is that very few on-road EVs operate at such low voltages. 96 volts DC is typically the lowest system voltage, and some EVs use battery packs over 300 volts. If you can develop a standard, this direct-DC approach might work. However, for overall efficiency, I recommend generating a standard grid voltage (120 or 240 volts AC) so that grid rechargeable EVs can use their existing on-board chargers in the solar carports instead of installing a second on-board charge controller, and so the carport can feed the grid when there are no EVs present, or those present are fully charged. > 4.Frontal Charging > Every parking spaces can leave rooms to have a charger with this faster > and more powerful chargers Must have universal spec for this frontal > charger, so EV/Charger/Carport manufacturers have the same set of > spec! Covered above. > 5.PV+EV > The new type of InGaN cells(Indium-Gallium-Nitride) cell has an efficiency > of 56% vs the > > silicon 14-18%! It can be applied to curved surfaces or windows! > Vehicles can be covered > > with PV and the cost is 60% cheaper than silicon PV! > > This is important for trailers, RV's! When there is no gas stations! > Leaving your vehicles under the > > Sun to recharge the battery pack is a way out of an emergency! Even > military vehicles can be > > benefited from sunlight charging if moving out of supply lines! > I'm not much of a fan of PVs on electric cars. Mostly because so many cars spend so much time parked in shaded areas, or in garages. Also, panels that are fitted to the vehicle surface cannot be optimally mounted for solar collection. So, in general, I prefer to see the PVs mounted in an optimized, stationary situation, possibly with maximum power point tracking. (Disclosure: I do have a PV panel on my electric Fiero conversion, which is used to top up the accessory battery. I have a PV panel on my electric boat, which is its primary charging source. However, the boat has much lower energy demands than an on-road car.) > > > In case we have a EV with > > 1)Li-Polymer Battery packs(or other advanced new type) with 200 or more > miles range > > 2)Covered with efficient flexible PV to get charged in day time! > > 3)Plus one set of spare battery packs > > 4)Faster charger electric stations both commercial or at homes/offices. > Day or night! > > > > 6.Hydrogen or Compressed air are both more expensive energy forms. > Agreed. And as near as I can figure out, compressed air just doesn't have competitive on-board energy storage compared to advanced batteries, but is only slightly better than conventional lead-acid battery technology today. > Electricity is popular and abundant, just don't burn more coals for > this increase need > > for fuel usage. Apply more renewable energy to generate more > electricity, we will be okay! > > To eliminate the negativities of car, oil consumption and air > pollutions. > > Finally the tailpipes on any cars will be history! > Put the tailpipe in the steering wheel. That might change the average driver's perception of the tailpipe emissions issue. > > > Anybody has a better idea, please share your thoughts! > > > > >From a PV Systems builder! > > > > > [Non-text portions of this message have been removed] > > > > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Biofuels list archives: > http://archive.nnytech.net/index.php?list=biofuel > > Please do NOT send Unsubscribe messages to the list address. > To unsubscribe, send an email to: > [EMAIL PROTECTED] > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > > ------------------------ Yahoo! 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