6
Usually there are devices on basis of commutator motor:
•
Some kinds of consumer electronics and office equipment (mixers,
vacuum cleaners, lawn-mowers, obsolete models of printers, faxes and
so on )
•
Electrical instruments and architectural engineering (screwdrivers,
drills,
fret-saws, planes, spray guns, grinding machines and concrete
mixers )
These devices are characterized by high in-rush currents at the moment of
switching on (first 3-5 microseconds) and consume nominal power (indicated
on them) at the moment of switching on/load only (when drill perforates,
grinding machine grinds and so on). In case of idling and working with weak
pressure of instrument they consume greatly less power. Remember that
process of operation can lead to situation under which power consumption can
greatly exceed nominal value (in case of drill sticking, for example).
Remember: power consumption of such devices (including total) should be less
than
output continuous power of inverter.
The more power reserve of
inverter concerning load is, the more stable is operation and service life of
inverter.
3.
Devices those consume half as much or twice as much power than the
nominal one.
As a rule, this group includes different devices based on induction motor –
pumps, compressors, refrigerators, air-conditioners
. These devices are
characterized by high in-rush currents at the moment of switching on and
consume half as much or twice as much power than the nominal one, since as a
rule available capacity is indicated, without taking losses into account.
Remember that their operation takes double energy content at the minimum.
For example, you need 2 kilowatt inverter for a pump with 1kilowatt power.
Microwave oven
also needs double energy content considering maximum
power of inverter (1 kilowatt microwave oven functions only with 2 kilowatt
inverter ).
