Select your appliances or equipment and Servolink will automatically calculate the connected load, running kVA, safety margin and recommended stabilizer capacity.
| Equipment | W / Unit | Qty | Total |
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A servo voltage stabilizer is equipment designed to stabilize unstable incoming input voltage. It continuously monitors the input supply voltage, senses irregular voltage flow, and automatically makes corrections so that it provides a stabilized output voltage to the connected appliances.
The main role of a servo voltage stabilizer is to protect electrical and electronic equipment. Since we cannot sense voltage fluctuations visually, these fluctuations can lead to permanent damage to equipment, reduced performance, and unexpected shutdowns. To prevent this damage, a servo voltage stabilizer corrects the input voltage supply before it reaches the connected load.
An undersized stabilizer will overload and trip repeatedly, or fail to protect connected equipment during voltage surges. An oversized unit costs more upfront and wastes standby power. The Servolink sizing engine calculates your actual running load (kVA), factors in motor starting current for compressors and pumps, and applies an appropriate safety margin so you land on the right capacity — not just a rough estimate.
Sizing a servo stabilizer correctly can feel tricky, and every manufacturer adds a 20–30% margin at the end regardless — so customers don't have to worry about future expansion. Once you see the actual math, it stops being intimidating.
Think about buying a kilogram of mangoes. What you actually want to eat is what's inside the fruit. But nobody sells you just the fruit — you pay for the whole kilogram, peel included. Motors work the same way electrically — part of the current goes toward useful work, and part goes toward magnetizing coils and other overhead that never shows up as output, but the stabilizer still has to supply it.
That combined total — useful work plus the extra — is kVA, not kW. This one distinction is probably responsible for more undersized stabilizers than any other mistake.
Defaulting to 1.0 because it's easier is exactly how stabilizers end up too small. When in doubt, 0.8 is a safe average to use across mixed loads.
| Load | Calculation | kW |
|---|---|---|
| 6 × Split ACs (1.5 ton each) | 1.5 ton × 1.75 ÷ 0.8 × 6 units | 19.69 |
| Refrigerator | — | 0.30 |
| Washing Machine | — | 0.50 |
| Water Pump (1 HP) | 1 HP × 1.75 ÷ 0.8 | 2.19 |
| Lighting, fans, TV, kitchen | — | 1.50 |
Total: 24.18 kW → ÷ 0.8 PF = 30.2 kVA → × 1.25 (25% margin) = 37.8 kVA
| Load | Power Factor | kVA |
|---|---|---|
| X-ray Machine (6 kW) | 0.82 | 7.32 |
| Ultrasound & monitoring gear (1.2 kW) | 0.90 | 1.33 |
| Two AC units (3 kW) | 0.80 | 3.75 |
| General lighting (0.8 kW) | 0.95 | 0.84 |
Total running load: 13.2 kVA. Clinics should use 30% margin due to imaging equipment — 13.2 × 1.30 = 17.2 kVA.
A servo stabilizer's main job is to correct voltage fluctuations. A non-inverter AC has a heavy-duty compressor, while an inverter AC uses a much lower-capacity compressor that can tolerate low voltage, sometimes running even below 200V, down to around 180V. But if the voltage drops even further than that, the inverter compressor stops working too. And if the PCB gets damaged due to irregular voltage, that damage isn't covered under warranty. So the real question is: why not take that precaution beforehand? Precaution is better than cure — it's simply protecting yourself from future problems.
It largely depends on the brand. An unbranded or local manufacturer — producing units without following the routine testing required under IS standards — can offer the same kVA rating for a much lower price. A branded manufacturer has an in-house manufacturing unit, trained engineers, and proper quality checks. That process costs money, and it shows up in the price. But it also means you're protected — with a branded company you know who to hold accountable if something goes wrong.
Yes, a single unit on the main line is the best choice. It provides stable, fluctuation-free voltage to the whole house — including small appliances like LED bulbs, whose drivers can get damaged by high or low voltage fluctuations too. It's simply not practical to install a separate stabilizer for every small appliance in the house, but installing one on your main line protects everything downstream of it.
Yes, it matters a lot. At Servolink, we use an LCD display with a True RMS controlled card, which is far more responsive and accurate than an analog card. It shows real-time voltage and current readings without any delay — not just a rough needle reading that lags behind what's happening on the line.
Installing a servo stabilizer is actually very easy — you just need proper guidance. Every stabilizer has two terminals: one input terminal where the incoming supply is connected, and one output terminal from which the stabilized voltage goes out to your load. If you're still unsure during installation, you can contact us — we're happy to guide you through it at no charge.
Add up the running wattage of every appliance you want to protect, convert the total to kVA using the power factor, then apply a safety margin — typically 20–30%, higher where motor-driven or compressor loads make up a larger share of the total. The calculator above automates this calculation for you.
A 20–25% margin is generally sufficient for electronic and lighting loads. Installations with a higher proportion of motors, compressors or pumps need a 30% margin to account for high starting (inrush) current.
Single phase servo stabilizers regulate a 230V supply and suit homes, shops and small offices. Three phase servo stabilizers regulate a 415V supply and are used for commercial buildings, factories and industrial machinery with higher connected loads.
| Equipment | W / Unit | Qty | PF | Total kW |
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