We take a look at electrical lawnmowers by operating every by way of a battery of exams (no pun meant, since we do run precise battery exams) and sure, we additionally mow stuff. There are specific product classes the place we accumulate, on the time, tons of knowledge, however regardless of our greatest efforts, knowledge alone can’t give us the complete image about which product performs the most effective. Taking these to the yard is one of the simplest ways to assist filter by way of and decipher the info we’ve.
Battery exams
Let’s start with these battery exams. This one is not too difficult, however it may possibly get a bit difficult to bodily arrange. To measure the voltage and amps the mower pulls throughout operation, we’ve to insert our measurement gadgets between the battery and mower. The bodily course of varies a bit from mower to mower, however as soon as arrange, we get a measure of the DC voltage and amps transferring between the battery and mower, which provides us an concept of the mower’s motor energy (in watts).
We take these measurements at zero load, that means we aren’t reducing grass on the time or in any other case offering any resistance in opposition to the blades, which might change the numbers, making them increased to calculate the upper limits of the motor’s energy. Our subsequent spherical of testing updates will embody these higher energy limits as properly.
RPM exams
Sure, we completely measure blade RPMs in electrical mowers. The eagle-eyed lab employees at CNET has developed the flexibility to depend dozens of revolutions per second in an excellent correct vogue. I am kidding, though we do have a meter for that. In actuality, we take a little bit of reflective tape and place that onto the mower blade, then intention the measurement software in order that the laser mild overlaps that tape and we get a exact studying on blade RPM.
You may see our take a look at meter in blue within the middle beneath the protection glass.
Now, if we mix these numbers with others reminiscent of blade lengths and weights and throw in a few of our motor energy calculations, we are able to estimate issues like the quantity of pressure, in Newtons, the blade is exerting on grass. These numbers aren’t exceedingly useful. Most individuals will not have a lot of an concept what 5 Newtons of pressure is similar to. We desire to take the route of evaluating the facility outputs to one thing persons are extra conversant in; on this case, horsepower.
Gasoline-powered push mowers range in horsepower, however the majority of them land within the 3 to 5-hp vary. We could have higher restrict numbers added for our subsequent replace, however you’ll be able to see that the decrease restrict in horsepower for the electrical mowers we examined ranged from about 0.1 to 0.6hp. That’s, not a lot. Typically, you must count on to see electrical mowers triple that quantity towards their higher limits, so we’re wanting within the 1.75hp ballpark. You will be hard-pressed to seek out retail gas-powered push mowers working beneath 2hp.
Noise degree
We discuss sound degree usually, particularly with outdoor-type instruments. Traditionally these out of doors gas-powered instruments have been fairly loud. (Attempt to sleep in when all of your neighbors are mowing early on the weekends.) With the appearance of electrical energy software platforms, that is all altering. Your neighbor can obsess over garden care whilst you snooze the day away.
We examined the decibel degree for the mowers from the standpoint of an individual working it. We stationary-mount a decibel meter and take the measurement. The outcomes weren’t too stunning, with our quietest mower being the smallest, the 13-inch Litheli at 68.6dB, and the loudest was additionally probably the most highly effective mower, the Ego, at 86.7dB.
Pace exams
You may usually consider mowers transferring at a sure price, particularly, at no matter price you occur to be pushing it. An growing variety of mowers at the moment are coming with self-propelled choices. Many of those electric-powered mowers help you use that perform even when the blades aren’t operating.
We measure how briskly mowers transfer in miles per hour. You will not be visiting any on-ramps with these, however for those who plan to make use of this mode, this may increasingly aid you determine which one to choose up or go on. The Ryobi had the widest vary of speeds to select from however fell barely wanting being the quickest mower. Ryobi topped out at 3.03mph and the Greenworks Professional at 3.33mph.
Some mowers, like this Kobalt mannequin, can get slowed down by grass clippings.
