Tuesday, February 15, 2011

Volt vs. Leaf

The Leaf or the Volt: Which is Better?

Felix Kramer of Calcars own both a Nissan Leaf and Chevy Volt. He likes both, but says the Volt “is a more dramatic story.”

The Leaf or the Volt: Which is Better?
The following is a post from Felix Kramer atCalCars, one of the original and most visible advocates of plug-in and electric cars. (Felix has driven Al Gore and several movie stars around in his plug-in Prius. He's in the center of the photo flanked by Ron Gremban, the tech lead at CalCars, and Andy Frank, the father of the plug-in hybrid..) A few weeks ago, the Kramer family became the first to own both a Chevy Volt and Nissan Leaf. They like both cars, but the extended range on the Volt comes in handy: the Kramers have already taken it to Tahoe and back twice.
Here is his initial review:
Since we got our Volt on December 22 and our Leaf January 24, I've felt like we've taken a time machine to the future. Since as the Founder of CalCars.org I've been doing little else but talk and evangelize about this for a decade, I thought I'd be ready for this moment. But now that it's really here, it's far better than I ever imagined!
Each car is like a 21st century space capsule, gliding silently through streets clogged with last-century vehicles. I was never so aware of the unique and ugly sounds from each gas-guzzler. At stoplights, I even feel their low-frequency vibrations. As a driver of a Prius since 2004, which 60,000 miles ago in 2006 was converted to a plug-in hybrid, and as an occasional driver of a RAV4 EV or a Tesla Roadster, I've had glimpses of how this feels. But it's completely different to drive this way almost all the time!
Each car greets the driver with fun as its first feature. The instant torque of electric motors turns each of them into rocket ships at low speeds, and easy lane-changers on the highway.
The driver's seat of the Volt feels like an airplane cockpit. It's a little intimidating at first, but reassuring after a few minutes of studying the controls and displays -- or just ignoring some for a while. The Leaf has a spare quality, and the simpler right-side panel is all about audio and climate.
Each car offers subtle clues about its fundamental character. The Volt puts a whole car between the front left electric door and the rear right gasoline door. Inside, the button to flip open the electric door stands out while I have to work to reach the gas-door release, giving the message, "You're not going to be using this very often." The Leaf's charging ports are under a giant door right in the center of the car's nose: "There's nothing going on in here but electricity."
Both cars have slipped up some on what's called "computer-human interface." We wish they'd listened to suggestions to put prototypes in the hands of Silicon Valley's usability experts last summer. For instance, the charging signals -- plug in the Volt and the indicator turns yellow (connected), then steady green (charging). Finally it flashes green (done). That's exactly the reverse of a user's expectations. The Leaf, with a longer charge time, starts out well, with three indicators that illuminate in succession as the car reaches its charge. But 15 minutes after it's full, all the blue lights go off. My first morning, when I greeted the plugged-in car, I wondered, "What happened?" Both MyLink and MyLeaf, the phone apps that enable me to monitor and control charging and many other activities, need major overhauls and quicker refresh times. (Since the Nissan app doesn't make Leaf all-caps, I've got permission to stop doing so.)
Each car's manual is full of important information -- far more than I got even in the superb orientations from Novato Chevy's Terry McCarter and North Bay Nissan's Victor Maldonado. But each is daunting, and, unsurprisingly, written defensively and sometimes in legalese. I downloaded them from http://www.chevrolet.com/­assets/­pdf/­owners/­manuals/­2011/­2011_chevrolet_volt_owners.pdf and http://www.nissan-techinfo.com/­refgh0v/­og/­Leaf/­2011-Nissan-Leaf.pdf . Alas, for a spare copy, pages designed to fit in a glove compartment don't print well on letter-sized paper. And while the Volt's Index listings are live links, the Leaf's aren't, though once I got inside its chapters I could click to navigate. Nissan and GM may be watching Hyundai, which turned its Equus manual into a downloadable app -- and included an IPad with the car.
We all know both cars will get better soon. All carmakers will learn from each other. (The savvy ones aren't relying on their customer service operations, but have budgeted for large teams to track down and analyze the tens of thousands of comments and suggestions strewn around online.) The automakers can quickly update some software features. One reason we leased the Volt instead of buying it is our expectation for future hardware improvements in Version 2. The Volt's big challenge is making the car a five-seater. Tomorrow, Nissan could promise to supply every Leaf with rear headrests that lower to the level of the top of the back seats. That will vastly improve the half-blocked rear window visibility. (We remove them and replace them when we have rear passengers.)
Rochelle's first comment was, "Hey, I love these cars!" (She and our son Josh, both shown at the CalCars.org "Plug-Ins Arrive" page, have been stalwart supporters.) She wishes both carmakers had personalized the mirrors so she doesn't have to reset them every time she gets in after I've driven it. Otherwise, she's happy to just be able to get into each vehicle, push the 'on' button and drive it like any other car. She says it was a bigger adjustment to switch from a 1997 Camry to a 2007 Camry Hybrid than from that car to the Volt. She appreciates the rear cameras, especially important now that most safety-conscious cars come with thick side pillars.
The Hard Numbers. Our Leaf experience began with a fair test with an EPA-assigned 73-mile range: from the dealer in Petaluma to Redwood City. Driving at 65 MPH the whole way and not bothering to detour around the steep hill in San Francisco between the Golden Gate Bridge and US 101 (which cost about 4 miles of range), we finished a 74-mile trip comfortably with 14 miles to spare. The Leaf is reassuringly predictable: with 80-100 miles of juice, most of the time, we don't think about range; we just drive around and charge it at night. With 163 miles in four days, it may become our first-to-use car, with the Volt reserved for times we both drive and for distances.
The Volt is a more dramatic story. In 37 days, we've driven 2,281.0 miles and used 33.4 gallons of gas. Does an average of 68.1 MPG sound disappointing? Not to us -- because it includes two round-trips to Lake Tahoe. Until now, no one could drive a plug-in car that route without refueling along the way: 225 miles, including 8,000 feet of Sierra elevations. (Read about that record-setting first trip and see photos at http://evworld.com/­article.cfm?storyid=1955.)
Here are details on the two Tahoe expeditions. First: 225.7 miles, 6.31 gallons at 35.8 MPG up, and 221.5 miles, 4.36 gallons at 50.8 MPG down. Second: 244.0 miles, 6.37 gallons at 38.1 MPG up, and 242.9 miles, 4.56 gallons at 53.2 MPG down. (The second time we more than confirmed the numbers. We don't know why we got better results even on a longer route with an additional passenger and more cargo.)
We started each of the four drives with a full battery (boosting our average), then had major uphill drives (reducing MPG). The combined 43.2 MPG is about what a second- or third-generation Prius gets on that route. (We expect the Gen2 Volt will improve its long-distance "charge-depleted" driving performance, which wasn't the top priority in GM's four-year push to meet the Volt's promised delivery date.) This proves a PHEV's best selling point: this one car can drive all-electric most of the time at its base location, then go any distance worry-free with good fuel economy, and again drive entirely electrically at its destination.
We've reached a sweet moment. Since 2005, CalCars has been trumpeting that plug-in hybrids (and extended range electric vehicles) get 100+ MPG of gasoline (plus a penny a mile of electricity). GM didn't squawk when the Volt sticker said its MPG when using gasoline and electricity would range from 69-168 MPG for 30-75 mile trips. Now our real-world Volt experience confirms both our experience with conversions and our predictions for production vehicles. Many of our Bay Area trips in the Volt have exceeded the car's typical 35-40 mile all-electric range -- and we've used our portable charging connector at a destination only once. When we subtract out the two long trips, our local 1,346.9 miles on 11.8 gallons were at 114.1 MPG. (And CalCars colleague Ron Gremban driving his Volt Lynne McAllister showed 205 MPG after their first 468 miles, mostly in Marin County.) As they say, QED -- point proven!

Tuesday, February 1, 2011

enphase and siemens

Enphase Microinverters Join Siemens’ Distribution Family
There are a dozen microinverter firms, but only Enphase Energy and Petra Solar are shipping products in commercial volumes.  Enphase just passed the 500,000 units shipped mark, while Petra has shipped more than 72,000 units.
We will report on the remaining microinverter startups and the rumored new entries as they gain commercial progress, but in the meantime, Enphase continues to win business, establish sales channels and increase momentum.
Siemens Industry and Enphase just announced a distribution agreement for the sale of Enphase’s PV microinverters through Siemens' network of electrical equipment distributors. Enphase will provide Siemens with solar microinverters as well as their web-based PV panel monitoring service. The Enphase device will be co-branded with the Siemens name.
Normally, a distribution agreement is not front-page news for this reporter, but here's why this might prove interesting.
Siemens Industry is the U.S. affiliate of Siemens’ global Industry sector business, a $43 billion business with $4.7 billion in profits last year. The firm is one of the world’s largest suppliers of production, transportation and building technology products.    
Those building technology products include breaker panels, switches and wiring, and their customers are electricians and plumbers and HVAC professionals. Here's the interesting part: Siemens trains tradespeople like roofers, electricians, plumbers and HVAC pros. The recession has hit those trades hard and they are in need of new skills and jobs. Solar installation could be an answer, especially with the relative ease and safety inherent in a microinverter-enabled design.
Note the potential workforce and manpower this could bring to the solar party:
  • 705,000 electricians
  • 569,000 plumbers
  • 292,000 HVAC specialists
  • 156,000 roofers
  • 3,000 solar installers
(U.S. figures from Bureau of Labor Statistics, 2007.)
Paul Nahi, the CEO of Enphase had this to say: "Siemens spearheading an effort to go after residential solar augments the solar installer profession with roofers, electricians and general contractors moving away from the specialty trades." Nahi added, "Siemens' push in residential and commercial solar with Enphase represents a shift in the way solar is being distributed."
As recently reported, startups Armageddon Energy and Clarian Power are also looking to this pool of new solar resellers, as is SaaS provider Clean Power Finance.

What happens when you sell your solar home?

A rooftop solar photovoltaic (PV) system is a long-term investment in your property: that the typical warranty on a solar PV panels is 20 to 25 years. And can do a lot over the course of two decades, including change your address. So what happens to that solar home energy system when you sell your house?
The short answer is that it stays with the house. And, depending on the market, your solar home may well sell at a premium compared to non-solar homes. In October of last year, for instance, the National Renewable Energy Laboratory (NREL) published a study showing that solar homes in San Diego typically sell for 15 percent to 20 percent more than homes without rooftop solar systems.
Why the premium for solar? Well, the monthly cost of owning a solar home is lower than owning a non-solar home. This means more money is available for things like, oh, your mortgage payment. Plus, if electricity prices increase, the solar panel owner’s savings increase, too. This is because a portion of their electricity usage will be locked into a fixed power rate.
If you’re in the market to buy a home, don’t let the higher price of a home with a rooftop solar system discourage you. You’re getting all of the aforementioned benefits and you can apply for an energy efficient mortgage, a program made possible by the U.S. Department of Housing and Urban Development. The mortgage can be as much as 20,000 more than a mortgage for a home without a solar PV energy system.