AMC vs CMC for Diesel Generators: Which Service Plan Should You Choose?
Annual Maintenance Contract or Comprehensive Maintenance Contract? This guide breaks down what each covers, what they cost, and which makes more sense for your diesel generator.
Rishabh Power Solutions Engineering Team
1 min read
Quick Answer
An AMC covers scheduled preventive maintenance — oil changes, filter replacements, inspections. A CMC covers everything in an AMC plus all breakdown repairs, spare parts, and labour. AMC = regular servicing. CMC = all-inclusive warranty.
Choose AMC if under 5 years old, <500 hours/year. Choose CMC if older, heavy usage, or critical operations.
AMC vs CMC Comparison
| Feature | AMC | CMC |
|---|---|---|
| Scheduled maintenance | Yes | Yes |
| Consumables (oil, filters) | Yes | Yes |
| Breakdown repair | No (paid separately) | Yes (included) |
| Spare parts | No | Yes |
| Emergency response | Charged extra | Included 24/7 |
| Major overhauls | No | Yes |
| Annual cost | 1.5–3% of generator value | 4–8% of generator value |
| Best for | New generators, light use | Older units, heavy use |
Pricing Guide
| Generator Size | AMC/year | CMC/year |
|---|---|---|
| 15–25 kVA | ₹8,000–₹15,000 | ₹20,000–₹35,000 |
| 50–75 kVA | ₹15,000–₹25,000 | ₹40,000–₹65,000 |
| 100–125 kVA | ₹20,000–₹35,000 | ₹60,000–₹1,00,000 |
| 200–250 kVA | ₹30,000–₹50,000 | ₹90,000–₹1,50,000 |
| 500 kVA | ₹50,000–₹80,000 | ₹1,50,000–₹2,50,000 |
When to Choose AMC
- Generator under 5 years old
- Fewer than 500 hours/year
- In-house maintenance team available
- Under manufacturer warranty
When to Choose CMC
- Generator over 5 years old
- More than 1,000 hours/year
- Critical application (hospitals, data centres)
- No in-house technical staff
The Hybrid Approach
Start with AMC for years 1–5, switch to CMC from year 6. Balances cost savings when new with protection when older.
Frequently Asked Questions
Can I switch from AMC to CMC?
Yes, most providers allow upgrades after a generator inspection. Pre-existing issues may need repair first.
Does CMC cover engine and alternator?
Standard CMC covers repairs. Complete replacement may be capped — check exclusion lists.
How often does a generator need servicing?
Oil/filter change every 250 hours or 6 months. Major service at 1,000 hours. Top-end overhaul at 8,000–10,000 hours.
Get a Service Quote
View AMC plans | View CMC plans | Request consultation | Call +91 9810145225
Rishabh Power Solutions Engineering Team
Power engineering insights from Rishabh Power Solutions