Suction power
Working power of the machine for suction.
The effort with which the unit draws in pollution during operation directly depends on this indicator. The greater this effort, the higher the quality of cleaning and the more effective cleaning. On the other hand, even in the heaviest and most performant models, the suction power does not exceed 1200 W — it simply does not make sense to increase it further. In addition, we note that with an increase in the width of the grip, the suction power must also be increased, otherwise, the efficiency will decrease. It means that only models of the same type with the same or almost the same working width can be compared in terms of suction power.
Waste detergent tank
The volume of the waste solution tank installed in the harvester.
Such tanks are equipped exclusively with floor scrubbers (including household ones) and window models (see "Type"): we recall that both of them are designed for suction of the solution from the treated surface. In general, the larger the tank, the less often it will have to be emptied, but the larger the dimensions and weight of the unit. Therefore, manufacturers usually choose this indicator taking into account the type and characteristics of the application of the machine. So, in devices for windows, which are held in the hands during operation, the capacity of the tanks for the spent solution is small — usually about 150 – 200 mL; this is quite enough, taking into account the format of application, and at the same time, such additional weight does not create inconvenience during work. In turn, scrubbing machines use containers of several liters or even tens of liters; usually, a specific volume directly depends on the overall “weight category” and the performance of the machine.
Battery capacity
The capacity of the battery installed in the cleaning machine with the appropriate power supply.
Theoretically, a higher capacity allows you to work longer on a single charge, but everything is not so simple. Firstly, battery life is also affected by the power consumption of the machine, and it is determined mainly by the motor power (see above). Secondly, the actual amount of energy stored in the battery depends not only on the capacity in amp-hours but also on the operating voltage in volts. Therefore, only batteries with the same voltage can be compared with each other in terms of capacity in Ah (or convert ampere-hours to watt-hours using a special formula and compare the results). And it is best to evaluate the battery life of the unit according to the directly claimed autonomy time (see below).
Autonomy time
The operating time of a battery-powered cleaning machine on a single charge of a standard battery.
By itself, this parameter is quite approximate: it is most often indicated for standard operation and simple conditions. However, the actual battery life usually does not differ much from the indicated one. So, according to the claimed autonomy time, it is quite possible to evaluate the capabilities of different models and compare them with each other.
Noise level
The noise level generated by the cleaning machine during operation.
A low noise level is important for the comfort of the operator and the people around. The latter is especially true in some specific places like hospitals or kindergartens. On the other hand, the higher the power, the louder, usually, the unit operates and the more difficult it is to reduce this noise to a certain level, even though in many cases the high volume of the work is not a particular problem. So it’s worth looking specifically for a “quiet” cleaning machine only if a low noise level is more critical for you than a high cost and/or reduced power.
When evaluating specific loudness values, note that the decibel used to indicate the noise level is a non-linear value. Therefore, it is easiest to evaluate specific values using comparative tables. Here is a simplified table for the range that most modern cleaning machines fit into:
55 dB — background sound in the office without special noise sources;
60 dB — loud conversation;
65 dB — city street with average traffic intensity;
70 dB — a conversation of several people in raised tones.
75 dB — high-power vacuum cleaner.
80 dB — traffic noise on a busy street.
Weight
The total weight of the cleaning machine. Usually, weight is indicated with empty tanks for detergent, waste, fuel, etc. At the same time, additional equipment, such as side brushes, may or may not be taken into account. Such equipment has a very small weight compared to the machines themselves. And, when installed/removed, does not seriously affect the mass of the entire machine.
