Cost to run: electric vs gas

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Here's my newest video on the EGO mower, my findings on the cost to run. I hope you enjoy!
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Posted 4 years ago

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Blue Angel, Champion

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Great video!!!

It's been so long since I used a gas mower I have no idea how much fuel it burns... maybe someone can chime in? It would be neat to see by how much $/year the Ego beats a gas mower.
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Steve Valdes

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It's great to know it's only about $.02 a full charge for the 4Ah (or 5Ah?). Should we include the cost of the battery over it's life span; say 500 charges(or?) also as a cost to replace fuel? I'm on the fence regarding this at this point.
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Um. No.
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Blue Angel, Champion

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Jacob, great work with the numbers!

I do have to add something though. WRT the efficiency of a gas mower engine, 40% is pretty optimistic! The 2016 Prius made headlines last year when Toyota's Engineers managed to crack the 40% thermal efficiency barrier:

The average modern car engine, with all of its advanced combustion chamber design, direct fuel injection and all the other tricks mixed in, is only about 30% efficient. I would be amazed if a gas lawn mower was even 20% efficient.

The other thing to keep in mind about gas engine efficiency ratings, they are all stated for the engine's peak operating efficiency, as in the best spot on the BSFC (Brake Specific Fuel Consumption) curve. When an engine is operating at anything but its optimum combination of speed and load, it's efficiency drops from that peak value... one of the reasons we see more and more speeds in car transmissions (keeps the engine in its sweet spot over a broader range of operating conditions).

In practice I would bet the average gas mower is extremely inefficient. Having said ALL that, we could just use someone's real usage data instead of going grey trying to calculate it. :-)
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David Cline

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Well not factoring some battery cost into the comparison is essentially the same as saying batteries are free and last forever. But that could actually be better than guessing what batteries will cost 5-10 years from now and ending up way off.

It's not at all uncommon to ignore some costs in this sort of analysis (salespeople do it all the time), usually for sake of simplicity or irrelevance to the immediate decision being made.

I'll never forget a physics professor I had who lamented having to control for or exclude variables that could never actually be ignored in the real world. He would grumble, "this is like studying massless elephants on frictionless planes."
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I hope you know that was a joke...
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Ugh good. People on here sometimes are just looking for a reason to cause an argument.
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John William Baxter

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Hello - I am really interested in this topic.  Had a 5.0 AH battery fail recently.  When you get older the years just spin by, so my initial perception is we just bought this yesterday and it cost a fortune and it has failed - what a rotten design.  Then I realized the battery was nearly three years old!  My next thought was hey I am willing to spend a fortune to avoid polluting as much (although this all depends on where my energy comes from).  Ego stuff is EXPENSIVE, but so are Teslas and people buy them.  My gut feeling is you don't save a cent, and you probably pay more to mow your lawn.  But I could be wrong, and even if it is more expensive the convenience and feeling that you might be helping just a tiny little bit to head off planetary destruction makes it all worthwhile.
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szwoopp, Champion

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I would say it costs more to go with battery power over gas. I accept that due to the quiet and convenience, no gas, no smell, no spills, no pulling a rope to start the motor, no gummed up carburetors, etc

With the chemicals involved in a battery I am not sure if there is any great environmental benefit other than the immediate area of the mower.  But again I am all in for the quite and convenience!

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I agree with szwoopp. I've got 2k in batteries (8 5ah batteries), I've saved probably 600 in gas vs electric cost over 5 years
Keep in mind I mow a large lot.
Also lithium cells will probably be the next worst thing to the planet.
But they are also not in the air so that is a plus side
I have also read that gas outdoor power equipment pollutes as much as 20 cars. Is it true? I don't know but they sure do stink like they do.