Yancheng Slong Machinery & Electric Co., Ltd. is one of the leading manufacturers and suppliers of 20kw natural gas standby generator for small businesses backup generator in China. With abundant experience, we warmly welcome you to wholesale durable products in stock here and get quotation from our factory. All customized products are with high quality and low price.




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Key Features & Benefits:
✔ Powerful 20kW Output – Supports multiple refrigeration units, POS systems, lighting & HVAC simultaneously
✔ Natural Gas Operation – Clean-burning & cost-effective with direct pipeline connection (no fuel storage needed)
✔ Automatic Transfer Switch – Seamless 30-second startup when grid power fails
✔ Commercial Durability – Heavy-duty construction with weatherproof enclosure for outdoor installation
✔ Low Maintenance – Fewer oil changes than diesel with self-diagnostic system
✔ Quiet Performance – 68-72 dB operation (quieter than most industrial generators)
| Model | SL-JK5 | SL-JK6 | SL-JK8 | SL-JK12 | SL-JK17 | SL-JK18 |
| Fuel Type | LPG & NG / Gasoline | LPG & NG / Gasoline | LPG & NG / Gasoline | LPG & NG / Gasoline | LPG & NG / Gasoline | LPG & NG / Gasoline |
| Frequency (hz) | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 |
| Voltage (v) | 220 120/240 | 220 120/240 | 220 120/240 | 220 120/240 | 220 120/240 | 220 120/240 |
| Gasoline(kw) | 5.0 / 5.5 | 6.0 / 6.5 | 8.0 / 8.5 | 12.0 /13.0 | 15.0 / 17.0 | 18.0 / 20.0 |
| LPG (kw) | 4.5 / 4.95 | 5.4 / 5.85 | 7.2 / 7.7 | 11.0 / 12.0 | 15.3 / 16.2 | 16.2 / 18.0 |
| NG (kw) | 4.0 / 4.4 | 4.8 / 5.2 | 6.5 / 7.0 | 10.0 / 11.0 | 12.0 / 13.6 | 14.4 / 16.0 |
| Power factor cos¢ | 1.0 | 1.0 | 1.0 | 1.0 | 0.8 | 0.8 |
| Fuel tank capacity (L) | / | / | / | / | / | / |
| LPG consumption at 75% load (kg/h) | 4.53 | 1.58 | 2.14 | 3.34 | 3.76 | 3.76 |
| NG consumption at 75% load (m3/h) | 1.79 | 1.84 | 2.02 | 5.12 | 6.18 | 6.18 |
| Fuel Tank | 25 L | 25 L | 25 L | 50 L | 50 L | 50 L |
| Noise level at 7m dB(A) | 69 | 69 | 69 | 69 | 69 | 69 |
| Starting system | Electric Start | Electric Start | Electric Start | Electric- start | Electric- start | Electric- start |
| Engine Model | SL390 | SL420 | SL460 | GB750 | GB1000 | GB1000 |
| Displacement (cc) | 389 | 420 | 459 | 750 | 999 | 999 |
| Packing size (mm) | 1000 × 570 × 790 | 1000 × 570 × 790 | 1000 × 570 × 790 | 1320 × 730 × 1075 | 1320 × 730 × 1075 | 1320 × 730 × 1075 |
| Net / Gross weight (kg) | 169 / 180 | 169 / 180 | 169 / 180 | 310 / 335 | 327 / 352 | 327 / 352 |
| 20'ft / 40'hq | 66/ 138 | 66/ 138 | 66/ 138 | 24 / 54 | 24 / 54 | 24 / 54 |

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