Controlled load applied
We use a resistive load bank to put real, measured demand on the generator so its performance under load can be observed rather than assumed.
Commercial & Industrial
Generator Load Bank Testing Services
A generator that starts isn’t the same as a generator that performs. Load bank testing applies a controlled electrical load so you find out whether your standby unit can actually carry real demand — before an outage does the testing for you.
Active emergency? Call 412-335-3994
What it is
What is generator load bank testing?
A load bank is a device that applies a controlled electrical load to a generator on demand. Instead of just confirming the engine starts and runs with no load, the test makes the generator produce real output and hold it — so you can see how it behaves when it’s actually working.
Running a generator under a genuine load is where problems surface. The test can reveal weaknesses in cooling, fuel delivery, and the exhaust system that a no-load start-up never touches — including the effects of wet stacking, the unburned-fuel buildup that comes from a diesel unit running lightly loaded for long stretches.
Why it matters
Starting is easy. Carrying the load is the real test.
Many standby generators spend most of their lives lightly loaded or running with no load through brief exercise cycles. That keeps the battery charged and the oil moving, but it doesn’t prove the unit can do the one job it exists for. A load bank test does.
- Proves real capacity — the generator is asked to produce and hold output, so you learn whether it can carry your load rather than just crank over.
- Stresses cooling and fuel — under load, a marginal cooling system, a fuel-delivery restriction, or a fueling problem tends to show itself.
- Addresses wet stacking — long, light-load running leaves unburned fuel in the exhaust; a load test brings the engine up to temperature and helps expose that buildup.
- Finds problems on your schedule — a controlled test is a planned event; an outage isn’t. It’s far better to learn the generator’s limits during a test.
Load bank on a 2G job
In the field
Real load, on your site
We bring the load bank to your facility and put your standby generator under genuine, measured demand — the same kind of load it has to carry when the utility drops — so its performance is proven, not assumed.
Commercial & industrial
Commercial generator load testing
We perform load bank testing on commercial and industrial standby generators across Western Pennsylvania — the systems that have to carry critical loads when the utility goes down.
Documented results
You get a clear record of how the unit behaved under load and anything we flagged — a useful baseline for the condition of your standby power.
Part of a maintenance program
Testing fits naturally alongside regular service, so issues found under load can be addressed. Planned maintenance →
Timing
When should a generator be load tested?
The right interval depends on the unit, how it’s used, and how critical the load is — so it’s worth setting against your specific equipment rather than a generic rule. A load bank test is commonly worth considering after commissioning a new or reconditioned unit, on a periodic basis as part of ongoing service, and for generators that spend most of their time lightly loaded and are therefore prone to wet stacking.
If a load test turns up a fuel-quality problem, cleaning up the stored diesel through fuel polishing is often part of the fix. And if the utility fails before the next scheduled test and the generator doesn’t perform, that’s an emergency service call — the situation load testing is meant to help you avoid.
Related services
Keep the whole system ready
FAQ
Common questions
What is generator load bank testing?
It’s a test where a load bank applies a controlled electrical load to your generator so it has to produce and hold real output. Rather than only confirming the engine starts, it shows whether the unit can carry demand and can surface cooling, fuel, and exhaust problems that a no-load start-up won’t reveal.
Why does my generator need load testing if it starts fine?
Starting proves the battery, starter, and basic fuel system work. It doesn’t prove the generator can carry your load. A unit can start and run cleanly with no load and still struggle under real demand because of a cooling, fuel-delivery, or wet-stacking issue — which is exactly what a load test is designed to expose.
What is wet stacking?
Wet stacking is the buildup of unburned fuel and residue in a diesel engine’s exhaust that comes from running the generator lightly loaded for long periods, so it never reaches full operating temperature. Applying a proper load brings the engine up to temperature and helps expose and work against that buildup.
How often should a commercial generator be load tested?
It depends on the generator, how it’s used, and how critical the load is, so we set the interval to your equipment rather than a one-size-fits-all schedule. Load testing is often worth considering after commissioning, on a periodic basis alongside regular service, and for units that spend most of their time lightly loaded.
Service area
Generator load bank testing across Western Pennsylvania
2G performs load bank testing on commercial and industrial standby generators throughout Western Pennsylvania, including the Pittsburgh region and our home area around Butler. Not sure whether you’re in our service area? Reach out and we’ll let you know.
Request Testing
Find out if your generator can carry the load
Tell us about your standby system and we’ll arrange load bank testing that fits it. Based in Butler, serving Western Pennsylvania.
Active emergency? Call 412-335-3994