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ATS Panel vs Synchronising Panel: Which Does Your Site Need?
An automatic transfer switch (ATS) and a synchronising panel do different jobs, and buyers often mix them up. One switches the load between sources. The other lets several generators run together.
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What an ATS Panel Does
- Senses when the mains fails and starts the generator
- Switches the load from mains to generator and back
- Prevents the generator and the mains from feeding the load at the same time
- Suits a single generator backing up the mains
What a Synchronising Panel Does
- Matches voltage, frequency and phase of two or more generators
- Lets them share the load and run in parallel
- Allows a set to be taken off for service while others carry the load
- Suits sites that need redundancy or load that grows in steps
When You Need Which
- One generator and mains backup: an ATS
- Two or more generators that must share load: a synchronising panel
- A large plant with redundancy needs: both, with the right protection
- A very small site: manual changeover may be enough
Questions to Ask the Supplier
- Whether the panel suits the exact make of the controller
- Fault protection and what happens when one set fails
- Whether the design allows adding another generator later
- Commissioning, testing and who provides support
Frequently Asked Questions
Can I add a second generator later?
Only if the controllers and panel are designed for paralleling. Say so up front so the first set and the panel can be specified for it.
Is a synchronising panel more reliable than a single big generator?
It can be, because one set can be down while others carry the load, but it adds complexity and cost, so it suits sites where downtime is expensive.
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