
How to Size a Standby Generator for Your Business
Most undersized generators were sized off a utility bill. Here is how to work out the load that actually matters, and why oversizing causes its own problems.
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Alternators, AVRs, switchgear, control gear and diesel engine spares for commercial and industrial operations across South Africa.
Explore our range of parts, spares and control equipment from leading brands.
G-Drive Engines17 parts
Alternators40 parts
Automatic Changeover Switches28 parts
Automatic Voltage Regulators (AVR's)61 parts
Diesel Engine Spares159 parts
Circuit Breakers17 parts
Genset Controllers11 parts
Adjustable Moulded Case Circuit Breakers (MCCB)10 parts
Manual Changeover Switches8 parts
Fuel Gauges, Sensor Alarms & Flanges40 parts
A sample from across the range. Every part is quoted on request — no pricing is published online.
A generator-drive diesel engine for new set builds and for re-powering an existing canopy. Rated at 30 kVA. Used on standby installations where the set has to come up and take load without anyone on site. Built to the original pattern, so surrounding components do not need adjusting. Send us a quote request and we will come back with pricing and stock.
A charging alternator for diesel engines, keeping the starting battery topped up while the set runs. Supplied at 16 kVA, 12.8 kW. Typical of commercial standby installations and hire-fleet sets. Dimensions follow the original component, so no modification is needed on assembly. Submit a quote request and a parts specialist will be in touch.
A transfer switch for unattended standby installations, sized by current rating and pole count. Supplied at 63 A, 3-pole. Fitted in generator control panels and changeover cubicles. Supplied to the original specification, which keeps fitting time predictable. Send us a quote request and we will come back with pricing and stock.
Voltage regulation for a genset alternator, keeping output inside tolerance through load steps. This one is 2 kW. Common on hospital, data and cold-chain installations where an outage has a real cost. It is ordered against its part number, so there is no guesswork about fitment. Add it to a quote request and our team will confirm the details with you.
Crankshaft main bearings supplied as a complete set, for overhauls where the block is already stripped. Listed at 68082 A. Fitted by workshops doing scheduled rebuilds on standby and prime-power sets. Stocked by part number, which is the quickest way to be certain of a match. Request a quote and we will confirm what is on the shelf.
A moulded case circuit breaker with an adjustable trip setting, for protecting generator and distribution circuits. Published rating: 63 A, 3-pole. Typical of commercial standby installations and hire-fleet sets. Identified by part number rather than by description, so the right item arrives first time. Ask for a quote and we will confirm fitment against your engine or set.
A control module for genset panels, covering starting, instrumentation and protection. Used on new builds and as a like-for-like replacement during a panel upgrade. Dimensions follow the original component, so no modification is needed on assembly. Submit a quote request and a parts specialist will be in touch.
A moulded case circuit breaker with an adjustable trip setting, for protecting generator and distribution circuits. Published rating: 125 A, 3-pole. Fitted in generator control panels and changeover cubicles. Listed against its manufacturer reference to keep ordering unambiguous. Request a quote and our parts desk will confirm availability and lead time.
Our full catalogue with brands, part numbers and specifications. Search 858 parts by number, name or brand.
View CatalogueCannot find what you need, or need a customised solution? Send us a request and our team will come back to you with pricing and availability.
Request a QuotePractical guidance on sizing, fault-finding and maintenance, written by our team.

Most undersized generators were sized off a utility bill. Here is how to work out the load that actually matters, and why oversizing causes its own problems.
Read article
An AVR is the first thing blamed when output goes strange and often the wrong thing. Here is how to narrow it down before spending money.
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Engines rarely fail without warning. They tell you for months first. Here are the signs worth acting on and the ones that mean stop now.
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