Plan diesel generator synchronizing panel RFQs by confirming load sharing, breaker scope, controller signals, protection, testing, and contractor boundaries.
What buyers should know first
A multi-set diesel generator project should be specified around the load profile, redundancy target, and electrical switching arrangement. The generator rating alone does not define the package. Purchasers should confirm whether the system needs manual paralleling, automatic synchronization, load sharing, utility paralleling, or only future-ready controls.
For Yangzhou Tesla Power Equipment Co., Ltd. to quote the package correctly, send the project load data, installation conditions, and electrical boundary requirements together rather than separating them across several messages.
In practice
In practice, many RFQs mention two or three generators but do not state who supplies the synchronizing panel, outgoing breakers, busbar, protection relays, cable terminals, and commissioning support. That missing boundary can delay the offer and create gaps between the generator supplier and the electrical contractor.
| Decision | What to confirm | RFQ effect |
|---|---|---|
| Operating mode | Standby, prime, N+1, peak support, or staged expansion | Defines control logic and load-sharing expectation |
| Panel boundary | Generator-mounted controls, separate synchronizing panel, or switchgear by others | Clarifies responsibility and wiring drawings |
| Load steps | Largest block load and expected start sequence | Affects voltage dip and generator response review |
| Protection | Breaker rating, short-circuit coordination, earth fault, reverse power | Prevents an incomplete electrical scope |
What to confirm before quotation
- State the number of generator sets and whether all units are identical.
- Confirm voltage, frequency, phase, neutral arrangement, and earthing method.
- List the control functions required: auto start, load sharing, auto stop, alarms, and remote signals.
- Ask for general arrangement drawings, single-line diagram, controller model, and factory test scope.
- Clarify whether site commissioning and load bank testing are included or handled locally.
Common configuration mistakes
- Assuming two standalone generators can parallel without matched controls and protection.
- Leaving switchgear responsibility unclear between supplier and contractor.
- Ignoring future expansion space inside the panel room.
- Comparing quotations without matching breaker, busbar, relay, and commissioning scope.
Internal references for specification work
For sizing assumptions, compare this topic with industrial generator sizing notes. For operating duty, review prime and standby rating differences. For an existing related note, see parallel diesel generator planning for factory expansion. Product configuration can be discussed from a large Cummins set such as Factory Discount Price 800KW 1000KVA Diesel Generator for Cummins Engine KTA38-G2B ATS Option 50/60Hz Frequency 230V/240V/480V R.
Documents to request with the offer
- Single-line diagram
- Load schedule
- Control philosophy
- Protection requirements
- Factory test record
- Commissioning boundary list
Questions purchasers often ask
Can different generator sizes run in parallel?
It may be possible with the right controls, but identical or closely matched sets are often easier to design and commission. Send the full load-sharing requirement before quotation.
Does every multi-set project need automatic synchronization?
No. Some projects use manual sequencing, while critical facilities usually need automatic synchronization and load sharing. The operating mode should be stated early.
Who should supply the synchronizing panel?
Either the generator supplier or electrical contractor can supply it, but the boundary must be clear. Controls, protection, wiring, and testing should match one responsibility matrix.
Should load bank testing be included?
For critical standby projects, load bank testing is usually worth specifying. Confirm test load, duration, acceptance records, and who provides the load bank.
Before sending an RFQ, prepare the connected load list, operating voltage, frequency, duty rating, installation layout, ambient conditions, fuel autonomy target, and any electrical boundary drawings. Clear inputs help the supplier quote the generator set instead of guessing the project scope.