Raspberryfisher's Blog

notes on fishing & travel

Stihl 510 vs Husqvarna ProFlex Mower

with 2 comments

My “job” has me defining-providing-managing energy solutions for telecom at difficult locations, and so I am exposed to a vast array of technologies for energy storage and power production. In this role, I constantly validate the effectiveness and performance of power and storage solutions.

So with this eye, I decided to look at what are the benefits and are their real gains with the new battery electric mowers versus my traditional mower?

In short, the answer is yes – get a Stihl!

lawnmower_DSC3057

The attached picture reflect 1/3 of the property I maintain (I am not including the woods behind the raspberry and blueberry bushes well beyond what we can see (on the other side of the house)).

Husqvarna ProFlex 18 with a 42″ Deck and Articulate Steering

The Husqvarna is a well made (fair design) 1999 riding land-mower with 18hp Briggs Stratton Gasoline Engine with Hydrostatic Transmission that supports a garden trailer.

  • With its 42 decks, I can cut the lawn in under 90 minutes.
  • I can consume 3+$ in fuel on a cut.
  • Generate 0.009 Metric tons of GHG (Green House Gas) with each cut.
  • My annual maintenance – from oil changes to overhaul – averages ~ 200$ a year.
  • My fitbit erroneous says I walk 8000+ steps once I am done bouncing around.

Stihl RMA 510 with 1 80 AHr Battery purchased this summer

Is a well made and well design lawnmower. As I see traditional mowers – including the premium brands, such as Honda – making their units cheaper – I appreciate Stihl focus on quality and ease of use.

I also considered Stihl’ service network, so I do expect in 10 years, when I need a new battery, it will be there.

  • Depending upon length and wetness of the grass, I need 2-3 charges to cut the property, which requires about ~200 minutes.
    • It is a slow recharge, so the activity- unless I buy another battery – takes two  sessions (afternoons) that last 50-70 minutes each,
    • Husqvarna is 2.5x faster
  • My cost to cut the property is about 0.15$, based on a burden cost of 0.17$ kwh, as measured by an un-calibrated energy meter.
    • I was surprise how low it was, so I have since calculated (again using my  experience in doing similar work (as my profession)) and confirmed this.
    • Husqvarna is 20x more expensive to operate
  • I generate less than 0.0002 Metric tons with week cut.
    • Husqvarna generates 40x more GHG
  • I expect my annual maintenance will be less than 60$ a year, allocating 40$ a year for battery replacement and an occasional blade replacement.
    • I would expect the battery support 2000 cycles (assuming I do not let it freeze in winter). As I am cycling the battery twice a week with a cutting season less than 8 months, I am generating 80 cycles a year, thus my battery life will be more function of aging chemistry (versus cyclic life). It is reasonable to assume 7+ years (10 is possible), and with the battery after taxes close to 280$, I am allocating 40% a year for battery replacement.
    • Husqvarna maintenance cost 3x than the Stihl.
  • And I am generating about 13000 real steps to cut the lawn.
    • I was once nudged by a old local farmer on an adjacent property to use a push hand mower to cut the lawn for ones health.
  • And the quality of the cut is very good (I would argue, better).

Summary

Unless you need a tractor mower, your first choice should  be a good battery operated lawnmower.

I can foresee the day, when gas is frowned upon – rightly so – as quality electric (battery)solutions are available.

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Disclaimer

I am not on any podium saying you must, should or need to go to an battery operated lawnmower.

I have no sponsors and nothing has been provided for free. I am just a “power-energy” engineer, who can confirm this is a wise decision.

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Written by raspberryfisher

2018/09/05 at 05:42

Posted in Life in the back

2 Responses

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  1. Dave, where did you purchase the Stihl RMA 510 ?

    >

    N. Shani

    2018/09/06 at 20:05

    • Rental Village – Carleton Place. Lee Valley has them too, but I have had my chainsaws and other equipment service well there for 13 years, so I am a satisfied customer and they get my repeat business. As you know on some posts, I can rant about bad service and bad products, but I happily note the good too.

      raspberryfisher

      2018/09/07 at 04:32


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