Built Around Generator Uptime, Not Guesswork
RelGen was founded in 1992 and has grown around one practical job: keeping generator sets ready when mains power is interrupted or when a site relies on generator supply for day to day operations. Our base in Midrand gives us access to Johannesburg, Pretoria, Centurion and Sandton, while our field teams also cover Durban, Cape Town and Polokwane for maintenance contracts and callouts.
We work with businesses that cannot afford repeated stoppages, from factories and warehouses to office parks, retail sites, construction yards and process plants. The work is hands-on and it is planned properly. Oil changes, filter replacement, coolant checks, battery testing and load bank testing all matter, and so does the paper trail that shows what was done and when.
Our approach is straightforward. We inspect, service, test and report. If we find a fault, we explain it in plain terms and sort the next step with the client before work carries on. That helps sites in Gauteng and along the coast avoid last-minute scramble and it also supports better budgeting for replacement parts and planned shut-downs.
How We Treat A Maintenance Contract
A good maintenance contract is more than a date on a calendar. It is a working arrangement that keeps the machine healthy, the records current and the site prepared for load-shedding or unexpected supply failures. We set service intervals around the generator type, usage, fuel condition and operating environment. Coastal humidity in Durban and Cape Town can change the service picture, while dust and long running hours on inland sites bring their own wear.
Each contract is managed with attention to detail by our office and field teams. We monitor scheduled servicing, site access, callout timing and the condition of consumables. If a changeover switch needs inspection, or the starter system is not cranking cleanly, we flag it early. Electrical work is always handled by qualified people in line with local regulations, because safety and compliance are not optional.
- Scheduled servicing with oil and filter changes
- Coolant system service and hose inspection
- Battery testing and terminal condition checks
- Load bank testing for controlled performance checks
- Changeover switch checks and fault finding
The Work We Stand Behind On Site
Generator servicing is only useful when the work is done properly on site. Our technicians check levels, seals, belts, hoses, battery condition, air intake paths and any signs of leaks or overheating. We also look at fuel system condition, because dirty fuel or blocked lines can cause starting trouble and unstable running. Starter system repairs and fuel system repairs are part of the work when a fault shows up.
We do not treat test runs as a tick-box exercise. Load bank testing is there to confirm that the set can carry demand under controlled conditions, not just idle in the yard. That matters for standby units that must start under pressure and for prime units that carry heavier day to day loads. It is also useful for identifying weak batteries, poor alternator performance or control issues before they become a bigger stoppage.
Where a site has a changeover switch, we check operation carefully because the switch is part of the handover between utility supply and generator supply. On some properties, that handover is tied to municipal and site rules, especially where access control, noise limits or operating hours apply. We work within those limits and keep the service activity neat and documented.
The People Who Carry The Spanners
RelGen is a team business. Thabo Engelbrecht leads the company, with support from people who know the pressure of an operating site and the cost of downtime. Naledi Shezi oversees operations, Johan Matlala manages service contracts, Ayanda Khoza coordinates field service, Muneerah Daniels leads technical support, Sibusiso Wessels handles senior technician work and Rikus Botha keeps stores and logistics moving.
That mix matters because generator servicing is not only mechanical. Parts need to be on hand, records need to be current and callouts need to be arranged so the right people arrive with the right tools. A site in Pretoria may need urgent support after a failed start, while a warehouse in Durban may need a planned inspection before a busy shift change. The team has to respond without confusion or delay.
- Clear job allocation from office to field
- Parts control for filters, batteries and service items
- Service records that are neat and easy to trace
- Practical feedback after each visit, not vague notes
What a RelGen service contract covers
Clients keep maintenance contracts because they want fewer surprises. They want a generator that starts cleanly, runs within limits and gets checked before a small issue becomes a shutdown. Our value lies in the routine work that is easy to ignore until it is too late. Preventive site inspections, service record audits and regular testing help avoid that cycle.
We also understand that many sites have mixed equipment and mixed teams. A plant manager may want a single service history for several sets, while a construction site may need temporary support for a standby unit used under changing site conditions. We are set up to work with both. The service plan is shaped around the equipment and the operating risk, not around a one size fits all checklist.
In practice, that means honest reporting, direct communication and practical follow through. If a battery is nearing the end of its life, we say so. If a coolant issue points to a deeper problem, we record it and explain it. That kind of work does not make a lot of noise, but it keeps machines available and it keeps managers informed.
Working Methods That Respect The Site
We aim to be tidy, safe and prepared. Our technicians arrive with the service list in hand, check access requirements and work in a way that suits the site. Some jobs need after-hours attention. Others need coordination around production shifts or security rules. We keep to that structure so the service does not interfere more than necessary.
Safety is part of the process at every step. Generator rooms, switchgear areas and fuel-related work all require care. Electrical work is only handled by qualified people under the relevant local regulations, and any testing or repair is done with proper control measures in place. That is how the work should be done, and it is how we do it.
Clients usually reach us through the enquiry form on our contact page, where the details can be logged and routed to the right person. From there we assess the need, arrange the next step and keep the service moving. It is a practical process and it helps when a site has loadshedding pressure or a generator that has to be ready tomorrow, not next week.