Choosing the right diesel generator size for your Rumah means the difference between powering everything comfortably and having a generator that trips breakers or wastes fuel. The most common mistake homeowners make is buying a generator based on square footage or “what the neighbor has” instead of calculating actual electrical load.
This guide provides a step-by-step method to calculate your home’s power requirements, understand starting vs running wattage, and select the optimal diesel generator size.
Melangkah 1: List Every Appliance You Need to Power
Not everything needs to run during an outage. Separate appliances into three tiers:
| Tingkat | Keterangan | Typical Load |
|---|---|---|
| Tingkat 1: Penting | Lemari es, freezer, pompa dengan baik, sump pump, furnace blower, peralatan medis, lampu, router/modem | 3-5 KW |
| Tingkat 2: Comfort | Tingkat 1 + window AC or one central AC unit, water heater, gelombang mikro, washer, televisi, komputer | 7-12 KW |
| Tingkat 3: Full Home | Everything including central AC, electric oven, electric dryer, pool pump, EV charger | 15-30+ KW |
Melangkah 2: Calculate Running and Starting Wattage
Every motor-driven appliance (lemari es, AC, pompa dengan baik, furnace blower) draws 3-7× its running wattage for 1-3 seconds at startup. This starting surge (inrush current) must be covered by the generator’s surge rating.
| Alat | Menjalankan Watt | Mulai Watt |
|---|---|---|
| Refrigerator/freezer (21 cu ft) | 700 | 2,200 |
| Chest freezer (15 cu ft) | 500 | 1,500 |
| AC sentral (3 ton, 14 SEER) | 3,500 | 6,000-8,000 |
| Jendela AC (12,000 BTU) | 1,200 | 3,600 |
| Well pump (1 HP, 230V) | 1,500 | 4,500 |
| Sump pump (1/2 HP) | 800 | 2,400 |
| Furnace blower (1/2 HP) | 800 | 2,400 |
| Electric water heater (4,500W) | 4,500 | 4,500 (resistive) |
| gelombang mikro | 1,200 | 1,200 |
| lampu LED (10 bulbs) | 100 | 100 |
| televisi + router + modem | 300 | 300 |
| Electric oven (single element) | 2,500 | 2,500 (resistive) |
| Clothes washer | 500 | 1,500 |
| Electric dryer | 5,500 | 5,500 (resistive) |
Melangkah 3: Apply the Load Calculation
Rumus: Generator KW = (Total Running Watts + Largest Starting Surge) − 1,000 × 1.25 (faktor keamanan)
Example calculation for a 2,000 sq ft home (Tingkat 2):
- Running total: Lemari es 700 + Freezer 500 + Well pump 1,500 + Furnace blower 800 + AC 3,500 + Lampu 100 + Elektronik 300 + gelombang mikro 1,200 = 8,600 watt
- Largest starting surge: AC compressor = 7,000 watt (during the 2 seconds the AC starts, everything else is running)
- Total surge requirement: 8,600 + 7,000 = 15,600 watt
- Dengan 25% faktor keamanan: 15,600 × 1.25 = 19,500 watts → 20 KW generator minimum
Recommended Diesel Generator Sizes by Home Type
| Home Type | Typical Size | Generator yang Direkomendasikan | Estimated Fuel (24H @ 75% memuat) |
|---|---|---|---|
| Small apartment / tiny home (Tingkat 1 only) | 5-8 KW | 8 KW SC Series | 15-20 L diesel |
| Medium home 1,500 kaki persegi (Tingkat 1 + partial comfort) | 10-15 KW | 15 KW YC Series | 30-40 L diesel |
| Large home 2,500 kaki persegi (Tingkat 2, one AC) | 20-25 KW | 20 KW SC or 25 KW YC | 50-65 L diesel |
| Large home 3,000+ kaki persegi (Tingkat 3, dual AC) | 30-50 KW | 30-50 KW SC/YC Series | 70-120 L diesel |
| Estate / farm with outbuildings | 50-100+ KW | 100 KW WC Series | 150-250 L diesel |
Important Considerations
Single-Phase vs Three-Phase
Most homes in North America use single-phase 120/240V split-phase power. Ensure the generator is configured for single-phase output. Tiga fase Generator can be used for homes but require a phase converter or careful load balancing, and you’ll only access 58% of the three-phase rating on single phase.
Continuous vs Standby Rating
Diesel generators have two power ratings: Siaga (khususnya) for emergency use, khas 100-200 jam per tahun, and Prime (PRP) for unlimited hours at variable load. For home backup, a standby-rated generator is sufficient and more economical. If you expect multi-day outages regularly, choose a prime-rated unit.
ATS (Sakelar Transfer Otomatis)
A properly sized ATS is essential. It must match the generator’s output amperage. Untuk a 20 KW single-phase generator at 240V: 20,000 − 240 = 83A. Choose a 100A-rated ATS. The ATS also determines whether you can power the entire house (whole-house switch) or only essential circuits (sub-panel with manual or automatic load shedding).
Penyimpanan Bahan Bakar
Diesel fuel stores well (6-12 months with stabilizer, 18-24 months in underground tanks), tidak seperti bensin. Calculate storage needs: A 20 KW generator at 75% beban mengkonsumsi sekitar 4-5 L/jam. Untuk 72 hours of continuous outage: 360Minimal 50. A 500L day tank provides a comfortable buffer.
Pertanyaan Umum
Q: Can I power my whole house with a 20 KW diesel generator?
A: For most 2,000-2,500 sq ft homes with one central AC, yes—with load management. Without load management, A 20 KW generator may struggle if the AC, electric oven, and dryer all run simultaneously. Adding a load-shedding controller ($300-500) automatically prioritizes essential loads.
Q: Apa yang terjadi jika generator saya berukuran kecil?
A: Voltage and frequency sag under overload. Motor-driven appliances (AC, lemari es) burn out from low voltage. The generator’s circuit breaker trips. Repeated overload shortens engine life. In worst case, the generator stalls while connected to the house.
Q: Is it better to oversize a home generator?
A: Slightly oversizing (20-30%) is good practice. Severely oversizing causes “penumpukan basah”—unburned fuel accumulates in the exhaust system because the engine never reaches operating temperature at very light loads. This reduces efficiency and damages the engine. Aim for 50-80% loading during typical outage conditions.
Q: How far from the house should a diesel generator be placed?
A: NFPA 37 requires a minimum of 5 feet from any openings (jendela, pintu, vents) Dan 5 feet from combustible walls unless the wall has a 1-hour fire rating. For noise comfort, 20+ feet is recommended. Check local codes—many municipalities have stricter requirements.
Q: Do I need a concrete pad?
A: Ya, a reinforced concrete pad is standard. Minimum 4 inches thick, extending 6 inches beyond the generator base on all sides. For larger units (di atas 30 KW), 6-inch reinforced concrete is recommended. Pre-cast pads are available for smaller units.
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Recommended Home Backup Generators
- SC Series Diesel Generator Set — 20-80 KW, ideal for home backup
- Genset Diesel Seri YC — 20-250 KW, hemat bahan bakar
