Choosing the right servo voltage stabilizer requires understanding your power requirements, input voltage conditions, and environmental factors. This buying guide walks you through every step.
Step 1: Calculate Your Total Load (kVA)
Add up the power rating of all equipment that will be connected to the stabilizer:
- Check the nameplate rating of each device (in Watts or kVA)
- Convert Watts to kVA: kVA = Watts ÷ Power Factor (typically 0.8)
- Add all values together for total connected load
- Add a 20-25% safety margin for startup surges and future expansion
Common Capacity Recommendations
| Application | Recommended Capacity |
|---|---|
| Home (1-2 ACs + appliances) | 5 kVA – 10 kVA single phase |
| Small office / clinic | 10 kVA – 15 kVA |
| Shop / showroom | 15 kVA – 20 kVA |
| Small factory / workshop | 25 kVA – 50 kVA three phase |
| Medium factory | 50 kVA – 200 kVA three phase |
| Large industrial plant | 200 kVA – 2000 kVA three phase |
| Hospital / data centre | 100 kVA – 500 kVA three phase |
Step 2: Check Your Input Voltage Range
Measure the actual voltage at your location using a multimeter over different times of day. Common scenarios:
- Mild fluctuation (200V-250V) — Standard input range stabilizer sufficient
- Moderate fluctuation (170V-270V) — Wide input range required
- Severe fluctuation (130V-270V or lower) — Extra-wide input range or higher capacity needed
Wider input ranges require larger variac windings, which may increase stabilizer capacity and cost.
Step 3: Choose Single Phase or Three Phase
- Single phase (230V) — For homes, offices, small shops with single phase supply
- Three phase (415V) — For factories, industrial equipment, three-phase motors, large commercial installations
Step 4: Choose Oil Cooled or Air Cooled
- Air cooled — Ideal for indoor, clean environments, lower capacities (up to ~300 kVA)
- Oil cooled — Required for continuous heavy loads, outdoor installations, high ambient temperatures (50 kVA – 2000+ kVA)
Step 5: Verify Protection Features
Ensure the stabilizer includes: high/low voltage cut-off, overload protection, short-circuit protection, phase failure protection (for 3-phase), time delay on restart, and emergency bypass.
Servo Stabilizer Price Guide
Servo stabilizer prices depend on capacity, type (oil/air cooled), input voltage range, and brand. Key factors affecting stabilizer price:
- Higher kVA = higher price
- Oil cooled is more economical per kVA at higher capacities
- Wider input ranges increase cost
- Factory-direct pricing eliminates dealer markups
For the most competitive servo voltage stabilizer price list with factory-direct pricing, request a free quote from ServoKai System. We manufacture all capacities from 1 kVA to 2000 kVA at our Delhi factory.
Why Buy from ServoKai?
- ISO 9001:2015 certified manufacturing
- Factory-direct pricing — no dealer markups
- 1-year comprehensive warranty
- CRGO-grade cores and copper windings
- Free technical consultation and site assessment
- Pan-India delivery and installation support
Contact our engineers or call +91-8383001512 for a free recommendation.