How Often Should You Clean Diesel Generator Air Filters?

The standard cleaning interval for diesel generator air filters is every 100 to 200 hours of operation in normal environments. In dusty or high-particulate conditions, reduce to every 50 to 100 hours. Always follow your engine manufacturer's specific maintenance schedule.

Can a Dirty Air Filter Damage a Diesel Generator?

Yes. A clogged air filter restricts airflow, causing incomplete combustion, black smoke, reduced power output, increased fuel consumption, and long-term engine wear. In extreme cases, dirt can enter the combustion chamber and score cylinder walls.

How Do You Clean a Diesel Generator Air Filter?

Remove the filter element, use compressed air at low pressure (max 2 bar / 30 psi) from the inside out, inspect for tears or deformation, and reinstall or replace if damaged. Never tap the filter against hard surfaces.

How Often Should You Replace a Diesel Generator Air Filter?

Replace the air filter after every 600 to 1,000 hours of operation, or at least once per year. For generators in harsh environments, replacement may be needed as frequently as every 300 hours. Always inspect visually during scheduled maintenance.

Diesel Generator Size for Home: Complete Sizing Guide (2026) %

Choosing the right diesel generator size for your Maison 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.

Table des matières

Étape 1: List Every Appliance You Need to Power

Not everything needs to run during an outage. Separate appliances into three tiers:

Étage	Description	Charge typique
Étage 1: Essentiel	Réfrigérateur, congélateur, pompe de puits, sump pump, furnace blower, équipement médical, lumières, router/modem	3-5 KW
Étage 2: Comfort	Étage 1 + window AC or one central AC unit, chauffe-eau, micro-ondes, washer, TV, ordinateurs	7-12 KW
Étage 3: Full Home	Everything including central AC, electric oven, electric dryer, pool pump, EV charger	15-30+ KW

Étape 2: Calculate Running and Starting Wattage

Every motor-driven appliance (réfrigérateur, CA, pompe de puits, 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.

Appareil	Watts courants	Watts de démarrage
Refrigerator/freezer (21 cu ft)	700	2,200
Chest freezer (15 cu ft)	500	1,500
Climatisation centrale (3 tonne, 14 SEER)	3,500	6,000-8,000
Fenêtre AC (12,000 BTU)	1,200	3,600
Pompe de puits (1 HP, 230V)	1,500	4,500
Pompe de puisard (1/2 HP)	800	2,400
Furnace blower (1/2 HP)	800	2,400
Electric water heater (4,500W)	4,500	4,500 (resistive)
Micro-ondes	1,200	1,200
Lumières LED (10 bulbs)	100	100
TV + 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)

Étape 3: Apply the Load Calculation

Formule: Generator KW = (Total Running Watts + Largest Starting Surge) ÷ 1,000 × 1.25 (facteur de sécurité)

Example calculation for a 2,000 sq ft home (Étage 2):

Total cumulé: Réfrigérateur 700 + Congélateur 500 + Pompe de puits 1,500 + Furnace blower 800 + CA 3,500 + Lumières 100 + Electronics 300 + Micro-ondes 1,200 = 8,600 watts
Largest starting surge: AC compressor = 7,000 watts (during the 2 seconds the AC starts, everything else is running)
Total surge requirement: 8,600 + 7,000 = 15,600 watts
Avec 25% facteur de sécurité: 15,600 × 1.25 = 19,500 watts → 20 KW generator minimum

Recommended Diesel Generator Sizes by Home Type

Home Type	Typical Size	Générateur recommandé	Estimated Fuel (24h @ 75% charger)
Small apartment / tiny home (Étage 1 only)	5-8 KW	8 KW SC Series	15-20 L diesel
Medium home 1,500 pieds carrés (Étage 1 + partial comfort)	10-15 KW	15 KW YC Series	30-40 L diesel
Large home 2,500 pieds carrés (Étage 2, one AC)	20-25 KW	20 KW SC or 25 KW YC	50-65 L diesel
Large home 3,000+ pieds carrés (Étage 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. Triphasé Générateurs 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: Attendre (ESP) for emergency use, typiquement 100-200 heures par an, 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 (Commutateur de transfert automatique)

A properly sized ATS is essential. It must match the generator’s output amperage. Pour un 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).

Stockage de carburant

Diesel fuel stores well (6-12 months with stabilizer, 18-24 months in underground tanks), contrairement à l'essence. Calculate storage needs: un 20 KW generator at 75% la charge consomme environ 4-5 L/heure. Pour 72 hours of continuous outage: 360L minimum. A 500L day tank provides a comfortable buffer.

FAQ

Q: Can I power my whole house with a 20 KW diesel generator?
UN: For most 2,000-2,500 sq ft homes with one central AC, yes—with load management. Without load management, un 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: What happens if my generator is undersized?
UN: Voltage and frequency sag under overload. Motor-driven appliances (CA, réfrigérateur) 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?
UN: Slightly oversizing (20-30%) is good practice. Severely oversizing causes “empilement humide”—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?
UN: NFPA 37 requires a minimum of 5 feet from any openings (fenêtres, portes, vents) et 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?
UN: Oui, a reinforced concrete pad is standard. Minimum 4 inches thick, extending 6 inches beyond the generator base on all sides. For larger units (au-dessus de 30 KW), 6-inch reinforced concrete is recommended. Pre-cast pads are available for smaller units.

Recommended Home Backup Generators

SC Series Diesel Generator Set — 20-80 KW, ideal for home backup
Groupe électrogène diesel série YC — 20-250 KW, fuel-efficient