How a DRUPS Works?DRUPS fly wheel Rotary UPS

DRUPS rotary flywheel UPS systems use kinetic electrical energy generated by a flywheel or multiple flywheels.
Uninterruptible Power Supply consisting of a flywheel continually spinning within a vacuum suspended by magnetic force. Frictionless spinning, yet, once the GRID power fails, the momentum of the flywheel generates enough electrical energy for up to 20 seconds to power the site load, during which the diesel generator starts up.

The DRUPS flywheel rotary works something like a dynamic battery that stores energy created by the spinning mass around an axis within a vacuum. Electrical input keeps the flywheel mass up spinning at very high speed.
This standby electrical charge to keep it spinning is a very small amount of amps. Yet it keeps the unit spinning 24 hours a day until it releases its stored kinetic energy as electrical power .

Rotary Diesel UPS (DRUPS) system always consist of a solid mass flywheel for the kinetic energy and provides guaranteed tolerances frequency that a static UPS would find intolerable.

Under normal operational conditions the mains GRID power feeds the DRUPS System with a low amp supply just to keep the flywheels spinning within their vacuums.
DRUPS systems stabilises the mains voltage within pre-determined  tolerances, thus providing power factoring as a by-product of the installed system. of the system, together with the ultimate NO Break power protection solution. All DRUPS Systems run continuously synchronised with the GRID mains supply.

What does the Acronym ,’DRUPS’ stand for?

It stands for Diesel Rotary Uninterruptible Power Supply devices = DRUPS.

Put simply, a DRUPS system combines the functionality of a flywheel-rotary powered UPS supported by a rapid start diesel generator. This enables power to be supplied continuously without any break in the event of a power outage.

Uninterruptible power supply devices are traditionally either Static UPS with the autonomy supplied by battery electrical storage VRLA or flywheel rotary flywheel kinetic energy.

Both systems provide immediate electrical power at the instant should the mains electricity supply fails.

Why choose a DRUPS system?

DRUPS can tolerate imbalanced loads with ease. They also can tolerate motor drives; inverter drives and inductive loads.

In fact, they are so robust that they can accept multiple power spikes and power drops without any of these disruptions feeding through into your site load.

Ideal for production plants where heavy plant machinery starts and stops frequently or randomly.

DRUPS also provide seamless clean power as well as power factoring.

How long will a DRUPS support a critical load?

As explained, these kinetic rotary flywheel systems, are made up of multiple flywheels. Should the site power drop for milliseconds, the storage kinetic electrical energy will supply NO BREAK electricity to your site, without any loss of power. In effect, your site will never see any power drops, power spikes or brown outs ever gain.

Should a serious power outage occur then the DRUPS will send a signal to the supporting diesel generator to start up to immediately to supply the electrical power the DRUPS needs flawlessly to support the building load.
This all happens automatically without any human involvement.

The flywheel control panel will start the accompanying diesel generator during those 20 seconds of the kinetic energy. These are rapid start diesel generators accept 100% within seconds.
Therefore, DRUPS can run forever as long as their diesel fuel is replenished.

Why containerised DRUPS ? rotary-ups-installation uninterruptible power

DRUPS systems are BIG.

Should you install DRUPS within the building it’s highly unlikely when you relocate that this expensive NO Break Power Protection system would be removed.

Therefore, we would advise that containerised DRUPS are flexible, practical and can be located outside the building.
In the event that you relocate, this valuable asset will move with you.

Containerised DRUPS systems can have a working life of over 35 years as long as they are regularly service and maintained.


The first step is to identify your individual site power requirements.
It’s crucial to bear in mind that your present load requirements may well change in the future. Therefore, review your current space and power constraints. Then review the loads of each piece of equipment.
Identify those that are critical and which are NON critical.

These can be separated out , to allow only the critical loads to be supported by the DRUPS.

Should you be unable to separate the loads, then the only remaining viable option is to power the whole site, totally, with an uninterruptible power solution, which means a DRUPS. Thereafter every socket on your site has uninterrupted seamless clean power, 24 hours a day.

For absolute ‘NO Break Power Protection’ there is only one solution – Diesel Rotary Uninterruptible Power Supply


For more information please contact Power Continuity on

0845 055 8455


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