I have never written a product review in my life, let alone post it on the internet, but after using the Worx WG780 Cordless Lawn Mower, I felt compelled to tell others about it.
I bought a corded lawn mower a few years ago that couldn't cut through short dry grass on a sunny day, so I returned it. BTW, I replaced several extension cords after my first experience. It was quite "shocking", if you know what I mean.
My current gas mower coughs, sputters, and stalls while cutting through spring grass. I can't get through 1/3 of the lawn before it quits altogether. I service it every year, but this year's quote was more than I paid for the mower in the first place. After 7 years, I decided it was time to try something new.
I researched all the electric lawn mowers on Home Depot's website (Lowe's doesn't have a store nearby) and almost convinced myself that today's lawn mowers were just like the old ones - gutless. All the other electrics (corded and cordless) were rated 1 or 2 on a scale of 5. Only the Worx cordless was rated 5 of 5. Enough said.
I brought my printout to Home Depot, asked for the product by name, model, and SKU, but the Customer Service desk said they didn't have any Worx mowers in their store, and none of the other stores had any in stock either. I finally found the buyer for the mower section who remembered one from inventory they just did last week. We found the mower stacked in a mixed pallet a couple of aisles over. It took a half hour to get a forklift, bring it down, and break the pallet.
I am so glad I waited. No, ECSTATIC. If I were Home Depot, I would put this mower front and center in front of the Homelite and Black and Decker mowers. This cordless mower is stronger than any corded mower I have ever used.
Frankly, I was surprised the battery was full when I opened the box. You know how you have to charge cordless and cellular phones overnight before using them? Not this time.
The Worx cordless lawn mower was fully charged right out of the box and carved effortlessly right through spring grass that was just as tall as the mower itself. My wife and kids thought I spent the whole day weed whacking the tall growth. I took pictures and video while mowing because I was dumbstruck by how well this mower worked.
We have several lawn sections on a lot of 2/3 acre. In comparison, my gas mower uses 1/2-2/3 tank to mow the lawn. I just cut down the deepest spring growth my yard has seen in years. I thought this thing would have been dead at the end. The battery indicator showed only 1/3 of the battery pack was used.
BRAVO Worx. I would be happy to sing your praises to anyone that will listen. If you are considering a new lawn mower, don't waste your time. Get this Worx WG780. I guarantee you won't be disappointed.
Monday, April 26, 2010
Thursday, January 21, 2010
Monday, January 18, 2010
Lithium Ion or Lead Acid Battery?
I own a 1999 Ford Ranger EV (electric vehicle) and decided to replace a worn out lead acid pack with a new set of lead acid batteries. My decision was driven mainly by cost. Even though lithium batteries dropped over 25% in cost over 2009, the conversion cost is still prohibitive at today's prices. A lithium ion pack for my Ranger EV at the end of 2009 cost approximately $13,200 compared to $3,000 for the lead acid replacements (which was about half price since they were warranty replacements).
Is it worth a $10,000 premium for lithium ion batteries? Maybe. Lead acid batteries survive about 350 charge/discharge cycles compared to Lithium Ion batteries that purportedly last for 2,000 cycles (or a car's lifetime) under ideal circumstances. After replacing my lithium laptop batteries annually for the last 10 years, I am not yet convinced that lithium lasts as long as they claim. If lithium drops another 25% in the 2010 as I hope, and lithium batteries hold up in EV applications, the upgrade will be a no brainer. $10K for a lifetime replacement vs. $6K annually? Lithium wins if battery manufacturers fulfill their claims.
Time will tell. So far, manufacturers have not guaranteed their lithium batteries for 10 years. Lead acid manufacturers know their batteries won't last that long. So for the time being, lead acid it is.
Is it worth a $10,000 premium for lithium ion batteries? Maybe. Lead acid batteries survive about 350 charge/discharge cycles compared to Lithium Ion batteries that purportedly last for 2,000 cycles (or a car's lifetime) under ideal circumstances. After replacing my lithium laptop batteries annually for the last 10 years, I am not yet convinced that lithium lasts as long as they claim. If lithium drops another 25% in the 2010 as I hope, and lithium batteries hold up in EV applications, the upgrade will be a no brainer. $10K for a lifetime replacement vs. $6K annually? Lithium wins if battery manufacturers fulfill their claims.
Time will tell. So far, manufacturers have not guaranteed their lithium batteries for 10 years. Lead acid manufacturers know their batteries won't last that long. So for the time being, lead acid it is.
2010 - Year of the Electric Car?
Will 2010 be the year of the Electric Car? I hope for the best, but prepare for the worst. Let me explain.
In 2009 GM, Ford, Nissan, Toyota, Aptera, Fisker, and others announced electric vehicles in their line ups for 2010 introduction (2011 model year). Like in previous years, these dates are still subject to change. Remember when ZAP announced the Alias in June, 2007? Two and a half years later the Alias hasn't yet hit the streets.
To date, only the Tesla is on the road as a production vehicle. What is holding up the others? One factor is common to all - the cost of batteries. Lead Acid batteries are relatively cheap but extremely heavy. Manufacturers won't use lead acid because the weight of the batteries themselves limit vehicle performance. Lithium Ion batteries are 1/4th the weight for the same amount of power. Unfortunately, they are many times more expensive than lead acid. Detroit's Big 3 say that Battery powered vehicles won't hit the mainstream until battery costs drop below $250/kilowatt-hour (kWh). Prices are about $1250/kWh today, or about 5 times where Detroit wants prices to be.
EVs have to offer a reasonably equivalent financial proposition to ever expand beyond a niche market. According to Boston Consulting Group in "Batteries for Electric Cars" (published Jan, 2010) 55% of EV buyers expect to break-even (compared to gas cars) on EV ownership costs within 3 years.
Would the average consumer buy an electric vehicle in 2010? Probably not. The same study calculated the break-even point in the United States as 15 years WITHOUT government incentives. The Boston Consulting Group study assumed $100/barrel oil, a $7500 tax credit, and a 40 mile per gallon gas powered equivalent vehicle. These are all reasonable assumptions in today's economy as one can argue whether today's $78 oil price is offset by an inflated 40mpg fuel economy rating.
Should car buyers consider electric cars ? Absolutely. Oil prices did not fall as much as expected in light of a poor U.S. economy. Global demand for oil is still too high, which will push gas prices higher as the U.S. economy recovers.
This study did not take into account ongoing maintenance costs. Electric traction motors have just 1 moving part compared to over 500 parts in a gas motor. After deducting maintenance costs for the other unnecessary parts like spark plugs, oil filters, muffler, alternator, transmission fluid, etc. the total cost of owning an electric vehicle is far less than the gas car. Drivers of the Toyota RAV4 EV will for the most part tell you their only maintenance costs are for rotating tires and replacing wiper blades.
Another assumption is that electric vehicle technology will continue unchanged into the future. Unfortunately, this assumption is incorrect. The latest version Prius Hybrid has far better regenerative braking than previous models, meaning more energy to recharge the batteries and less wear and tear on the brakes. Panasonic's latest lithium ion batteries offer significantly higher capacity and faster recharge times, meaning more miles per charge and charges that take less than one hour instead of overnight.
Increasing gas prices (pushed by global demand), decreasing battery prices (driven by volume production), combined with current tax incentives and lower maintenance costs, could easily push the break-even point for Electric Vehicles down to the three year mark, or even less.
In 2009 GM, Ford, Nissan, Toyota, Aptera, Fisker, and others announced electric vehicles in their line ups for 2010 introduction (2011 model year). Like in previous years, these dates are still subject to change. Remember when ZAP announced the Alias in June, 2007? Two and a half years later the Alias hasn't yet hit the streets.
To date, only the Tesla is on the road as a production vehicle. What is holding up the others? One factor is common to all - the cost of batteries. Lead Acid batteries are relatively cheap but extremely heavy. Manufacturers won't use lead acid because the weight of the batteries themselves limit vehicle performance. Lithium Ion batteries are 1/4th the weight for the same amount of power. Unfortunately, they are many times more expensive than lead acid. Detroit's Big 3 say that Battery powered vehicles won't hit the mainstream until battery costs drop below $250/kilowatt-hour (kWh). Prices are about $1250/kWh today, or about 5 times where Detroit wants prices to be.
EVs have to offer a reasonably equivalent financial proposition to ever expand beyond a niche market. According to Boston Consulting Group in "Batteries for Electric Cars" (published Jan, 2010) 55% of EV buyers expect to break-even (compared to gas cars) on EV ownership costs within 3 years.
Would the average consumer buy an electric vehicle in 2010? Probably not. The same study calculated the break-even point in the United States as 15 years WITHOUT government incentives. The Boston Consulting Group study assumed $100/barrel oil, a $7500 tax credit, and a 40 mile per gallon gas powered equivalent vehicle. These are all reasonable assumptions in today's economy as one can argue whether today's $78 oil price is offset by an inflated 40mpg fuel economy rating.
Should car buyers consider electric cars ? Absolutely. Oil prices did not fall as much as expected in light of a poor U.S. economy. Global demand for oil is still too high, which will push gas prices higher as the U.S. economy recovers.
This study did not take into account ongoing maintenance costs. Electric traction motors have just 1 moving part compared to over 500 parts in a gas motor. After deducting maintenance costs for the other unnecessary parts like spark plugs, oil filters, muffler, alternator, transmission fluid, etc. the total cost of owning an electric vehicle is far less than the gas car. Drivers of the Toyota RAV4 EV will for the most part tell you their only maintenance costs are for rotating tires and replacing wiper blades.
Another assumption is that electric vehicle technology will continue unchanged into the future. Unfortunately, this assumption is incorrect. The latest version Prius Hybrid has far better regenerative braking than previous models, meaning more energy to recharge the batteries and less wear and tear on the brakes. Panasonic's latest lithium ion batteries offer significantly higher capacity and faster recharge times, meaning more miles per charge and charges that take less than one hour instead of overnight.
Increasing gas prices (pushed by global demand), decreasing battery prices (driven by volume production), combined with current tax incentives and lower maintenance costs, could easily push the break-even point for Electric Vehicles down to the three year mark, or even less.
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