LiOA voltage stabilizer DRI – 15000 II
Does the power in your home often weaken in the evening? Is the air conditioner not cooling, the refrigerator humming, or the lights flickering? These are signs that the input voltage is fluctuating – and a voltage stabilizer is exactly the device that protects your household from these risks.
1. What is a voltage stabilizer? Operating principle
A voltage stabilizer is a device that automatically corrects a fluctuating input voltage – typically ranging from 150V to 250V – to a stable output of 220V ± 1–2%. As a result, the electrical appliances in your home always receive power at the correct standard, operating reliably and safely.
Operating principle:
- The stabilizer continuously measures the input voltage
- When it detects a deviation from 220V, a servo motor or electronic circuit automatically adjusts the transformer winding
- The output is always maintained at a stable 220V, with a response time under 0.5 seconds – fully automatic
2. When do you need a voltage stabilizer?
Not every home needs a voltage stabilizer. But if you fall into any of the situations below, it is an indispensable device:
Households:
- Areas with weak power supply, rural areas, or at the end of a power line
- Homes with air conditioners, refrigerators, washing machines, or storage water heaters
- Sudden voltage surges after a power outage (240–250V)
Offices & shops:
- Computers, printers, network equipment
- Security camera systems
- Preventing data loss caused by unstable power
Workshops & industry:
- CNC machines, welding machines, industrial refrigeration systems
- Equipment requiring a precise power supply
- Reduced long-term maintenance costs
3. What happens if you do not use a voltage stabilizer?
Illustration: an electrical cabinet burned out due to voltage overload
| Problem | Consequence |
| Low voltage (<200V) | Air conditioner fails to cool, washing machine spins weakly, lights become dim |
| High voltage (>240V) | Burned-out circuit boards, capacitor failure, shortened appliance lifespan |
| Continuous fluctuation | Appliances wear out quickly, consume more power, and pose fire and explosion risks |
A voltage stabilizer costs a few million Vietnamese dong, but the cost of repairing or replacing an air conditioner or refrigerator can run to tens of millions. A voltage stabilizer is a protective investment, not an expense.
4. How to choose the right stabilizer capacity?
Choosing the wrong capacity is the most common mistake. Apply this simple formula:
Formula: Total appliance power (W) × 1.2 ⁄ 1,000 = required kVA
Example: Air conditioner (1,200W) + Refrigerator (150W) + Washing machine (500W) = 1,850W × 1.2 = 2,220W → a 3 kVA stabilizer is required
| Usage need | Capacity | Suitable LiOA series (suggested) |
| 1 room (TV + fan) | 1–2 kVA | SH-1000II, SH-2000II |
| Whole house (air conditioner + refrigerator) | 3–5 kVA | DRI-3000II, DRI-5000II |
| Villa, multiple air conditioners | 7.5–10 kVA | DRI-7500II, DRI-10000II |
| Small workshop, shop | 15–20 kVA | SH-15000II, DRI-20000II |
Note: If your area has a very low input voltage (below 90V), choose the DRII series with an input voltage range of 50V–250V.
5. Why choose a LiOA voltage stabilizer?
With more than 35 years of manufacturing in Vietnam, LiOA is a brand with deep insight into the country’s power grid conditions – the foundation of the lasting trust of millions of Vietnamese households.
What makes the real difference:
- Manufactured in Vietnam for over 35 years, with thorough understanding of Vietnam’s grid conditions
- Pure copper windings – durable, high efficiency, excellent heat dissipation
- Genuine LiOA factory warranty
- A diverse product range: single-phase and three-phase stabilizers, capacities from 0.5 kVA to 2,000 kVA, suitable for everything from households to large-scale manufacturing plants.
See the full range of LiOA voltage stabilizers at: https://lioa.com.vn/en/voltage-stabilizer
Need advice on choosing the right capacity for your home or business? Contact LiOA for free support.
