August 26, 2008

Saving $8 a year with my lawn mower

The high price of gasoline has hit us all at the pump. Today's average price is $3.69 and just a month ago it was over $4. Another place we use gasoline is with our lawnmowers. You can save money by using an electric lawn mower instead of a gas powered one.

"An efficient gas mower will use ¼ of a gallon of gasoline per hour." So that means that a half hour mowing job like my lawn will take 1/8 gallon of gas per mow. I have to mow the lawn half the year where I live so thats about 25 mows per year. If I were using a gas mower that would equate to 3.125 gallons of gas per year to mow the lawn. At an average cost of $3 per gallon that is $9.37 per year in gas costs for an efficient gas mower.

My electric mower is a 1000W model. So I'm using 1000 W x 0.5 hours or 0.5 kWh per mow. With 25 mows a year thats 12.5 kWh per year. My electricity costs $0.09 kWh so this means I'm spending $1.125 per year in electricity to mow my lawn with my electric mower.

So by using an electric mower I'm saving over $8 a year on gasoline

TO keep this practical you'll have to have a relatively small lawn that can be handled by an electric mower. Also the cost of the electric mower shouldn't be significantly higher than the gas version.


2 comments:

  1. You forgot the cost of replacing the batteries in the electric every few years! At $80 every 4 years or less, that's $20 per year! You just LOST $12 per year with your electric. And if you have to drive somewhere to get the special batteries you have to add the cost of that gas too!

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  2. There is no battery in an electric mower unless its a cordless rechargeable style. The cordless ones are actually pretty expensive compared to corded. So if you're trying to save money you ought to buy a mower with a cord. The cord is a bit less convenient but really no worse than using a vacuum cleaner in your home.

    And I'd expect the rechargeable battery to last longer.

    Black and Decker says:
    "On average, the useful life of an 36V NiCd battery is 150-200 full charge cycles "
    If you mow weekly 6 months out of the year then that should give you 6-8 years.

    ref:
    http://www.blackanddecker.com/pages/promotions/promo36voltCordlessMower/promoMowerBattery.aspx

    Jim

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