Cordless garden machines and tools

Most garden equipment retailers offer a collection of cordless garden mechanisms as an alternative to gasoline-powered mechanisms.

Cordless mechanisms and tools are based on equivalents with an electric motor and power cord, but are powered by a rechargeable and replaceable battery. Although battery machines have a lower output than petrol or machines with an electric motor and a supply cable, they have many advantages. Ultimately, they are also cheaper, because the whole system can use one battery.

Economic, environmental and operational benefits

Garden mechanisms, whether mowers, trimmers, brushcutters, lawnmowers, chainsaws, or gasoline-powered leaf blowers and vacuum cleaners for non-commercial domestic use, are used only a few hours a week or a month from spring to autumn. . In other words, one machine, such as a lawn mower, would theoretically cover the needs of seven to ten family homes with gardens. It is similar with other machines and tools, but such sharing of mechanization is still at odds with our nature, so at present every garden owner owns all the necessary mechanization. The most expensive component of these mechanisms is clearly the gasoline engine, so each owner had to invest in 3-4 engines. In contrast, in electrically driven mechanisms, the most expensive component is the battery. However, unlike an internal combustion engine, we can use it with several devices if they are compatible with each other. Of course, we won’t use a heavy-duty mower battery in hedge trimmers, so we usually need two batteries, one heavier with higher capacity for more powerful machines and the other light for hand tools.

Machines and tools with an electric motor are much simpler and more reliable in construction than gasoline engine equivalents because they contain much less moving parts. They do not have an internal combustion engine, gearbox, ignition, larger machines or a starter battery and starter, they do not have a cooling system or an exhaust, which are issues that require maintenance in conventional internal combustion engine machines. There is also no need to change oil, oil or air filters. In addition, the electric motor provides high torque from minimum speeds. The big advantage of electric machines is also minimal noise and zero direct emissions. In contrast, small internal combustion engines have a problem with soundproofing and exhaust emissions. More precisely, it is not so much a technical problem, but a problem of reasonable size. A good example is a mower with a petrol engine, which has only a simple muffler. For the muffler to be truly effective, the mower’s exhaust would have to be similar in size to the motorcycle’s exhaust. Also, a catalytic converter to eliminate exhaust gases would make garden mechanisms significantly more expensive, not to mention that every mechanism with an internal combustion engine would have it.

Energy density comparison

The battery with a voltage of 60 V and a capacity of 6 Ah, which is 360 Wh, has a weight of 2 kg. This represents an energy density of 180 Wh / kg. Gasoline has a calorific value of 43,545 kJ / kg, which is 12,100 Wh / kg, ie 67 times more. So if the battery were to supply the same energy as 2 kg of gasoline, it would have to weigh more than 135 kg. However, efficiency comes into play. Internal combustion engines achieve an efficiency of about 20%, while the efficiency of the electric motor is 95% or more, so the equivalent weight of the batteries would be about 28 kg. Unlike hand tools, in the case of lawnmowers and ride-on mowers, the weight of the batteries is not a problem; on the contrary, it is useful for the drive wheels to have a better grip.

Battery Life

Of course, electric machines and tools only make sense if you have a solved charge. Imagine a typical garden scenario with a cottage in an area where there is no electricity. This is not a problem in the current petrol era. You can bring a 5 or 10 l petrol canister to the cottage and you can use a small garden mechanization. In the case of rechargeable batteries, you will bring one, maximum two charged batteries with you, so you will definitely be interested in the endurance of electric garden mechanisms and tools with a single battery. We present the average declared time for devices with a 40 V / 5 Ah battery. Such a battery weighs approximately 2 kg and has a charging time of 70-160 minutes, depending on whether you use a quick charger or a cheaper standard charger. With the quick charger, you can charge the battery to 80% capacity in half an hour.

• Hedge trimmer 120 min
• Mower 40 cm 70 min
• Branch cutter 70 min
• Trimmer 70 min
• Mower 45 cm with drive 60 min
• Verticulator 60 min
• Cultivator 25 cm 60 min
• Krovinorez 50 min
• Chainsaw 45 min
• Compressor 40 l / min 40 min
• Vacuum cleaner / blower 30 min
• Pressure washer 20 min

We emphasize that this is the operating time given by the manufacturers, which was measured under ideal conditions. In real conditions, the endurance per charge will be shorter, sometimes significantly. For example, there is a difference between mowing a low, regularly maintained lawn and mowing higher, denser grass. Speaking of the cordless mower, with a 40 V / 5 Ah battery, you can mow approximately 500 m according to the manufacturer.2. In more demanding conditions, of course, it will be less. By the way, note that the highest consumption, and therefore the shortest endurance, has a pressure washer. This is not because it needs a more powerful engine than a ride-on mower, but because consumption could not be measured there under “ideal” conditions, because constant power is required to achieve the required pressure.

Large mechanisms

Larger machines, such as more powerful garden mowers, have a 2-4 kW engine, so they need higher capacity batteries that are larger and heavier to achieve the required operating time, so they are built into and charged in a specific machine. From the point of view of the home user, it would not even matter if the batteries from the garden tractor could be transferred to another machine. You can use the battery from the mower in a verticutter, chainsaw, blower or vacuum cleaner, or in a pressure washer, but you usually only have one machine the size of a mower tractor at home.

Perspective

The replacement of internal combustion engines in the so-called small mechanization goes hand in hand with the advent of electric cars. Maybe in twenty years there will be no place to refuel the lawnmower or small tractor, or it will be possible, but very unusual. I was convinced of this by an incident from a gas station, when the girls wanted to refuel a Trabant, which they apparently borrowed from someone as a recession at a party. Older motorists warned them that they could not refuel petrol directly into the tank, but into the canister, where it would be mixed with oil in a suitable ratio and only then poured into the tank. It used to be a common practice for owners of two-stroke vehicles, but today the young generation is virtually unaware of it.

INTRODUCTORY PHOTO SOURCE: shutterstock.com

AL-KO Bosch Home & Garden

The new product family of 18 V AL-KO rechargeable batteries from Bosch Home & Garden allows you to use one battery for tools from several brands. The batteries are compatible not only with mowers, trimmers, hedge trimmers, cultivators, verticutters, saws, tree trimmers, blowers and AL-KO pressure cleaners, but also with the Bosch tool system.

• Cena: 49,99 EUR (2.5 Ah battery), 99 EUR (5 Ah battery)

Einhell GE-SC 35 Li – Solo Expert Plus

The cordless lawn aerator (verticalizer) allows you to achieve an even and dense lawn. The verticutter has a working width of 35 cm, it is suitable for lawns up to 500 m2, has a simple system for adjusting the working depth to three positions so that the roots of the lawn are not pulled out. The height-adjustable handle allows you to work effortlessly and can be folded during transport or storage. The carbonless motor and stainless steel blades guarantee a long service life.

Price without battery: 175 EUR

Güde RM 36-0.43

Powerful cordless lawnmower from the 18V E3 cordless tool series with a cutting width of 43 cm. It has a maintenance-free brushless motor, a 6-position central cutting height adjustment and a collection bin with a capacity of 55 l and a level indicator. It uses two 18 V batteries, such as the AP 18-40 with a capacity of 4 Ah and a charger from the Easy-Energy-Exchange series, which are sold separately.

Cena: 239 EUR

INTRODUCTORY PHOTO SOURCE: shutterstock.com

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Source: Nextech by www.nextech.sk.

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