1 kVA online UPS (1000 VA) from Keyhan Energy is a single-phase uninterruptible power supply with a double-conversion topology and a pure sine wave output, intended for sensitive loads — loads whose operation or lifespan is threatened by a momentary power cut or a distorted waveform. The technical specifications on this page are taken from the official product catalog; anything not stated in the catalog is not claimed on this page either.
1 kVA online UPS technical specifications
The rows in the table below are taken from the official product catalog; only the warranty row is a placeholder and refers to the company's stated terms. When comparing with other units on the market, we suggest asking the competing vendor for these same rows — especially topology, output waveform and transfer time, which is where the real difference between units shows.
| Parameter | Value |
| Capacity | 1000 VA / 800 W |
| Topology | Online, double conversion |
| Output waveform | Pure sine wave |
| Output voltage | 220 V, ±2% to ±3% |
| Output frequency | 50 Hz ±1% |
| Input voltage | 170 to 265 V, single-phase |
| Transfer time | 0 ms (4 ms to bypass) |
| Efficiency | Up to 90% on mains, up to 85% on battery |
| Battery | 12 V sealed lead-acid (SLA) or 12.8 V lithium iron phosphate (LiFePO4) |
| Charge current | 15 A for SLA and 20 A for lithium, up to 100 Ah |
| Operating temperature | −10 to +50 °C |
| Noise | Less than 50 dB |
| Protection and monitoring | 16 hardware and software layers, alarm, LCD display |
| Control software | In-house; designed and written by Keyhan Energy |
| Warranty | Warranty as per the company's announced terms |
What double conversion means and why it matters here
In a double-conversion architecture, the incoming power is first rectified, and the inverter then rebuilds the output waveform from the intermediate bus. That means the load is never connected directly to mains; it is always fed from the inverter output. The practical result of this architecture is three things:
- Transfer time 0 ms. Because the load's supply path does not change at the moment of outage, there is no interruption to make up for. The only case where a transfer applies is switching to bypass, which takes 4 ms.
- Rebuilding of the output waveform. Because the inverter generates the output, the load is fed from the inverter output rather than the grid's instantaneous waveform. What is guaranteed about output quality are the figures in the table above: 220 V with a tolerance of ±2% to ±3% and 50 Hz with a tolerance of ±1%. No figure for harmonic distortion is given in the catalog, and none is claimed on this page.
- Wide input window. The unit operates from 170 to 265 V, so on weak or end-of-line grids it does not go to battery as long as voltage stays within this range.
The international reference for stating UPS performance and test requirements is IEC 62040-3 (general title: Uninterruptible power systems — Method of specifying the performance and test requirements). The text, tables and class definitions of that standard are not reproduced on this page, and the standard itself is the final reference; nor does this page make any claim of certified compliance for this product. A conceptual explanation of UPS types is on the Industrial UPS page.
Pure sine-wave output and real loads
This unit's output is a pure sine wave at 220 V with ±2% to ±3% tolerance and 50 Hz with ±1% tolerance. The difference between a pure sine wave and a stepped or quasi-sine wave looks small on paper but is decisive in practice: switching power supplies, small motors, transformers and instrumentation usually run hotter on a non-sinusoidal wave, generate more noise, and some zero-crossing detection circuits may not work correctly.
The unit is rated at 1000 VA and 800 W. When adding up the load, check both figures separately; the total apparent power of the loads must not exceed the VA rating and the total active power must not exceed the W rating. Whichever fills up first is your real ceiling.
Battery choice: sealed lead-acid or lithium iron phosphate
This UPS works with both battery families: 12 V sealed lead-acid (SLA) or 12.8 V lithium iron phosphate (LiFePO4). The built-in charger supports 15 A for SLA and 20 A for lithium and accepts up to 100 Ah; backup time can therefore be set by choosing a suitable battery bank.
- SLA Usually chosen where the initial cost is decisive and the unit spends most of its time in float mode.
- LiFePO4 Usually considered where weight, space and the number of charge/discharge cycles matter; in this product the accepted charge current for lithium is also higher.
If you want to see the battery options before deciding, the Industrial Battery page shows our range. For applications where battery charging is needed separately from the UPS, Sealed Lead-Acid (SLA) Battery Charger and Lithium Battery Switching Chargers are our two independent product lines.
Protection, monitoring and in-house software
The unit has 16 layers of hardware and software protection and is equipped with an alarm and LCD display. A breakdown of exactly which event each layer covers and how it is reported on the display or alarm is not itemized in the catalog; if your project needs that breakdown, ask us for it.
What sets this product apart, however, lies elsewhere: The unit's control software is in-house; we designed and wrote it ourselves. That means the unit's control logic is not a black box in someone else's hands, and for technical questions about the software's behavior, the answers come from here. Our other product lines include Telecom Rectifier and Cathodic Protection Switching Power Supply as well.
Environmental and installation conditions
The operating temperature range is −10 to +50 °C and the unit's stated noise level is below 50 dB; choose the installation site with these two figures in mind. Observe the following points for installation:
- Keep the unit's air inlet and outlet paths clear and do not place it against walls or objects.
- Keep the battery bank within its permitted temperature range; excessive heat shortens battery life.
- The cross-section and length of the cable between the battery and the unit should be selected to suit the charging current.
- Finalize the load list before installation so that the VA and W ceilings are respected.
Frequently asked questions about the 1 kVA online UPS
How does this unit differ from an ordinary UPS?
In an online double-conversion UPS, the load is always fed from the inverter output and the transfer time is 0 ms. In other types, the load is normally on mains and must switch to the inverter on an outage. See the full comparison of types on the Industrial UPS page.
What is this UPS's backup time?
Backup time is not a fixed number; it depends on battery bank capacity and load power. The unit supports up to 100 Ah, so by choosing the battery you can approach the time you want. For an exact calculation, send your load list via the Contact page.
Does it also work at low grid voltage?
Yes. The unit's input window is 170 to 265 V single-phase, and as long as grid voltage stays within this range the unit operates without going to battery.
Is a lithium battery better, or lead-acid?
Neither is absolutely better; it depends on the application. The unit supports both, with a charge current of 20 A for lithium and 15 A for SLA. Choose based on weight, space, cycle count and budget.
What is the product warranty?
Warranty is as per the company's announced terms. Contact us for the exact wording of the terms.
Quotes and orders
To receive a technical proposal and price, send your load list and required backup time via the Contact form and we will propose a suitable configuration for the unit and battery bank. If your project needs other equipment besides the UPS, the Equipment Supply and Services pages show the scope of our work; and if the goal is grid-independent supply, Solar Inverter and Solar Power Plant are complementary options. Our completed work in this field includes the 400 kW Bardaskan plant, the 400 kW ISACO plant and the 200 kW Loshan plant.