Send a photo of the site main breaker or distribution-board nameplate together with the load list. The generator voltage and phase must match the installation, while motors and air conditioners must be checked for starting current.
10kW single-phase vs three-phase generator comparison
| Decision | Single phase | Three phase |
|---|---|---|
| Typical output | 230V, line and neutral, subject to order specification | 400/230V, three lines and neutral, subject to order specification |
| Common small-site use | Homes, shops, small offices and other sites with single-phase circuits | Sites with three-phase motors, pumps, machinery or a three-phase board |
| Load planning | Total protected load is considered on one phase | Total rating is shared across three phases and single-phase loads require balance |
| ATS arrangement | Often a two-pole arrangement, subject to earthing and design | Often a four-pole arrangement where neutral switching is required |
| Main mistake | Underestimating the starting current of AC, freezer or pump loads | Assuming the full generator rating is available on each individual phase |
How much output current is available?
A 10kW generator is commonly described as about 12.5kVA at a 0.8 power factor. The approximate rated current depends on the specified kVA and voltage:
Single phase current = kVA x 1000 / voltage
Three phase current = kVA x 1000 / (1.732 x line voltage)
| Reference configuration | Approximate apparent-power current | Important limitation |
|---|---|---|
| 12.5kVA at 230V single phase | About 54A | Breaker, cable and connection rating must match the final set. |
| 12.5kVA at 400V three phase | About 18A per line when balanced | Total kVA is shared; allowable phase unbalance must be confirmed. |
These are planning calculations, not a substitute for the generator nameplate or electrical drawing. Frequency, voltage tolerance, power factor, breaker rating, cable size and derating are part of the final design.
Why phase balance matters on a small generator
A three-phase generator can often supply 230V single-phase circuits from phase to neutral, but loading one phase heavily while the others are light can cause voltage imbalance, overheating and reduced usable capacity. The alternator maker sets an allowable unbalance limit.
Prepare the load schedule by phase. Put lighting, sockets, refrigerators and air conditioners into separate rows, then show which phase each circuit uses. If nearly all the protected equipment is single phase, a single-phase generator may provide a simpler and more usable result.
Three-phase pumps or workshop motors require their rated kW, current, starting method and duty. Direct-on-line starting can require much more generator capacity than the motor's normal running power suggests.
What to confirm in the factory quotation
| Item | Required written detail |
|---|---|
| Output | Voltage, phase, frequency, wire arrangement and neutral provision |
| Rating | Prime kW/kVA, standby kW/kVA, power factor and ambient reference |
| Protection | Main breaker poles and current, earth connection and controller protections |
| Alternator | Make/model or agreed technical standard, winding and phase-unbalance guidance |
| Changeover | Manual changeover or matched ATS voltage, poles, current and control scope |
Use a qualified electrician to confirm site compatibility and installation protection. Nigeria Generator Supply is a China-based factory-direct supply website; Nigerian installation and local approvals are included only when written into the commercial scope.
Continue the 10kW specification
Once the phase is confirmed, calculate the expected operating cost with the 10kW diesel generator fuel-consumption guide. If automatic mains failure operation is required, review the 10kW generator with ATS guide. For price factors and delivery terms, see the 10kW diesel generator quotation page.
Hello, I need a 10kW generator quote for Nigeria. Site supply: [single/three phase], voltage: [ ], main breaker: [ ]A, load list: [ ], largest motor or AC: [ ], starting method: [ ], ATS: [yes/no], silent or open type: [ ], delivery: [CIF Lagos/FOB China].
Send this RFQ on WhatsAppFrequently asked questions
Should I buy a single-phase or three-phase 10kW generator?
Choose from the actual site supply and loads. A site using only 230V single-phase circuits commonly needs a single-phase set. A site with three-phase motors or distribution may need a three-phase set.
Can a three-phase generator power single-phase equipment?
It can when correctly configured, but the single-phase loads must be distributed so one phase is not overloaded. Confirm neutral, voltage, protection and alternator limits.
Does a three-phase 10kW generator provide 10kW on each phase?
No. The total rating is shared across all three phases. It is not 10kW per phase.
