# Uninterruptible power: UPS and batteries

Online UPS and VRLA batteries for PBX rooms, server-room racks and branch cabinets. Promark uses Vertiv Liebert GXT RT+ / GXT5 UPS units and Exide Sprinter batteries in its solutions and handles selection, installation and maintenance across Türkiye and in Turkmenistan.

Source: https://www.promark.tr/en/solutions/platforms/ups-aku

## What does it do?

A UPS keeps the load running from its batteries when mains power fails or the voltage is disturbed. The Vertiv Liebert GXT RT+ (1,000–3,000 VA) and GXT5-5000 (5,000 VA) are online double-conversion UPS units: input power is converted to DC and then back to a clean sine-wave AC. Even in normal operation the PBX, servers and switches run from this conditioned output rather than directly from the mains.

Runtime is set in two ways: the UPS's internal batteries and, where needed, external battery cabinets (EBC). With internal batteries the GXT RT+ gives about 3 minutes at full load and 9–10.5 minutes at 50% load; the GXT5-5000 gives 7 minutes at full load and 18.5 minutes at 50%. Each model has its own battery cabinet for longer runtimes.

In -48 V DC systems at telecom sites the batteries connect directly to the DC bus; here we use Exide GNB Sprinter P/XP 12 V VRLA AGM block batteries (P12V875 41 Ah, XP12V1800 56.4 Ah). The same batteries are also used in UPS battery strings. The UPS units are monitored over SNMP and web through a network card; Vertiv Power Insight software can shut servers down automatically during a long outage.

## Which scenario does it fit?

- **OpenScape Business / OpenScape 4000 PBX room:** GXT RT+ 2000–3000 VA or GXT5-5000 for AC-powered PBX hardware, network switches and the PoE switches feeding IP phones / DECT base stations. If a longer runtime is needed, an external battery cabinet is added.
- **Server-room rack:** Rack-mounted GXT5-5000 for servers, storage and core switches: 5,000 VA / 5,000 W, hardwired input, 2 × C19 and 6 × C13 outputs. Orderly shutdown of virtual servers with Power Insight.
- **Branch cabinet:** GXT RT+ 1000–1500 VA, 86 mm high, for the branch switch, router and small PBX. Installed in a rack or as a tower; monitored over USB/RS232 or an SNMP card.
- **Telecom site DC system batteries:** Exide Sprinter P12V875 or XP12V1800 in strings of 4 × 12 V blocks for Eltek -48 V DC power systems. The number of blocks and strings is calculated from the discharge table according to the load and the required runtime.

## Key features

- Online double conversion: the load is fed continuously from a conditioned pure sine-wave output (GXT RT+ and GXT5)
- Output power factor 0.9 on the GXT RT+ and 1.0 on the GXT5: 3,000 VA = 2,700 W, 5,000 VA = 5,000 W
- Rack / tower: the same unit installs either way; a 4-post rack kit and tower feet come in the box
- Runtime extension: a dedicated external battery cabinet (EBC) for each GXT RT+ model; up to 10 cabinets can be connected to the GXT5 and are detected automatically, and a single cabinet raises full-load runtime from 7 to 19 minutes
- Battery management: user-replaceable hot-swap batteries; on the GXT5 temperature-compensated charging, programmable automatic battery self-test, battery health status and replacement date prediction
- Monitoring: network card for SNMP and web (GXT RT+ LI38000B020, GXT5 IntelliSlot RDU120), relay contact card, USB/RS232; 4 user-definable dry contacts on the GXT5
- Vertiv Power Insight (free): monitoring of up to 100 devices, alarms, automated server shutdown, vCenter / vXRail / Nutanix plugin
- Exide Sprinter P12V875: 12 V, 41 Ah (C10, 1.80 V/C), 1,157 W/block over 10 minutes (1.60 V/C, 25 °C), 200 × 169 × 176 mm, 14.5 kg
- Exide Sprinter XP12V1800: 12 V, 56.4 Ah (C10, 1.80 V/C), 1,840 W/block over 10 minutes (1.60 V/C, 25 °C), 21.0 kg; both models AGM, maintenance-free (no topping up), EUROBAT 2015 "Long Life 10–12 years" design life, IEC 60896-21/-22

## UPS model comparison

|  | GXTRT-1000IRT2UXL | GXTRT-1500IRT2UXL | GXTRT-2000IRT2UXL | GXTRT-3000IRT2UXL | GXT5-5000IRT5UXLN |
|---|---|---|---|---|---|
| Rating (VA / W) | 1000 / 900 | 1500 / 1350 | 2000 / 1800 | 3000 / 2700 | 5000 / 5000 |
| Topology | Online double conversion | Online double conversion | Online double conversion | Online double conversion | Online double conversion |
| Output power factor | 0.9 | 0.9 | 0.9 | 0.9 | 1.0 |
| Form factor | Rack/tower, 86 mm (2U) | Rack/tower, 86 mm (2U) | Rack/tower, 86 mm (2U) | Rack/tower, 86 mm (2U) | Rack/tower, 217 mm (5U) |
| Size W × D × H (mm) / weight | 438 × 310 × 86 / 11 kg | 438 × 410 × 86 / 15.9 kg | 438 × 410 × 86 / 18.2 kg | 438 × 632 × 86 / 26.6 kg | 430 × 630 × 217 / 70.8 kg |
| Input | IEC C14, 120–300 VAC | IEC C14, 120–300 VAC | IEC C14, 120–300 VAC | IEC C20, 120–300 VAC | Hardwire, 230 VAC |
| Output receptacles | 6 × C13 | 6 × C13 | 6 × C13 | 6 × C13 + 1 × C19 | Hardwire + 2 × C19 + 6 × C13 |
| Internal battery runtime (100% / 50% load) | 3.1 / 9 min | 3.2 / 9 min | 3.2 / 9 min | 3.3 / 10.5 min | 7 / 18.5 min |
| External battery cabinet | GXTRT-EBC24VRT2U | GXTRT-EBC36VRT2U | GXTRT-EBC48VRT2U | GXTRT-EBC72VRT2U | GXT5-EBC192VRT3U, up to 10; 19 / 48 min with +1 cabinet |
| Communication | USB, RS232; optional SNMP/web card, relay card | USB, RS232; optional SNMP/web card, relay card | USB, RS232; optional SNMP/web card, relay card | USB, RS232; optional SNMP/web card, relay card | Network card (IntelliSlot RDU120: SNMP, web, environmental sensors), USB, serial port, 4 dry contacts |

Source: Vertiv Liebert GXT RT+ 1000–3000 VA 230 V brochure (© 2022) and Vertiv Liebert GXT5 5–20 kVA 230V brochure (SL-70564-EMEA, R01/26). Runtimes are for internal, fully charged batteries. The U value is given from the unit height and the model code (…RT2U / …RT5U). Exact runtime is confirmed in the BOM with the actual load and number of battery cabinets.

## Expansion and maintenance scenarios

### Extending runtime later

An external battery cabinet is added without replacing the UPS: GXTRT-EBC24V / 36V / 48V / 72V depending on the GXT RT+ model, and GXT5-EBC192VRT3U for the GXT5-5000. With one cabinet the GXT5 reaches 19 minutes at full load and 48 minutes at 50%; it detects the cabinets automatically and calculates the remaining runtime accordingly.

### UPS maintenance without dropping the load

The Liebert MicroPOD maintenance bypass for the GXT RT+ (1000–2000 VA: MP2-210K, 3000 VA: MP2-220L) and the integrated maintenance bypass POD on the GXT5 5–10 kVA allow the UPS to be removed without powering down the connected equipment.

### Battery replacement

UPS batteries are replaced with a per-model battery kit (GXTRT-24BATKIT … GXTRT-72BATKIT, GXT5-192VBATKIT). The GXT5 predicts battery health and replacement date; in DC systems, battery replacement is planned from periodic measurements and discharge tests.

## UPS or DC power?

**AC UPS (Vertiv Liebert GXT)**

- Servers, network switches, storage and AC-powered PBX / IT loads
- Server rooms and branch cabinets; rack or tower installation
- Runtime in the range of minutes, extendable with external battery cabinets
- SNMP monitoring and automated server shutdown with a network card and Power Insight

**[-48 V DC power system (Eltek)](https://www.promark.tr/en/solutions/platforms/eltek-dc-guc)**

- Telecom and transmission equipment fed from -48 V DC
- Batteries connected directly to the DC bus; no inverter stage
- Large battery strings for runtimes in the range of hours
- N+1 redundancy and capacity growth with modular rectifiers

## Promark's scope of services

- Site survey: load list (W), age of existing UPS / batteries, rack space, input supply and ambient temperature
- Sizing: UPS rating, runtime target, external battery cabinet or battery string calculation; BOM within 24–48 hours
- Installation: rack mounting, hardwired connection, cabling of battery strings
- Commissioning: SNMP/web card, alarm notifications and an automated shutdown scenario with Power Insight
- Maintenance: battery measurements, UPS battery tests, periodic checks and a battery replacement plan
- On-site service across Türkiye and in Turkmenistan

## Sectors

- [Hospitals](https://www.promark.tr/en/solutions/healthcare)
- [Energy & Industry](https://www.promark.tr/en/solutions/energy)
- [Public & Critical Facilities](https://www.promark.tr/en/solutions/public)

## Related catalog products

- [Vertiv Liebert GXT RT+ — Online Double Conversion UPS (1-3 kVA)](https://www.promark.tr/en/products/vertiv-gxt-rt)
- [Vertiv Liebert GXT5-5000 — Online Double Conversion UPS (5kVA / 5kW, 230V)](https://www.promark.tr/en/products/vertiv-gxt5-5kva)
- [Exide GNB Sprinter P12V875 — 12V 41Ah VRLA AGM Battery](https://www.promark.tr/en/products/exide-12v-41ah)
- [Exide GNB Sprinter XP12V1800 — VRLA/AGM Battery (12V 56.4Ah)](https://www.promark.tr/en/products/exide-12v-56ah)
- [Eltek Flatpack S — 1U Compact 48V DC Power System](https://www.promark.tr/en/products/eltek-flatpack-s)
- [All products in the family: UPS (Vertiv Liebert)](https://www.promark.tr/en/products/ups)
- [All products in the family: Exide VRLA AGM Battery (12V 41Ah / 56Ah)](https://www.promark.tr/en/products/battery-banks)

## Frequently asked questions

### How long does a UPS last, and how is runtime calculated?

Runtime depends on the load in watts and the amount of battery. According to Vertiv's tables the GXT RT+ gives 3.1–3.3 minutes at 100% load and 9–10.5 minutes at 50% on internal batteries; the GXT5-5000 gives 7 minutes at 100% and 18.5 minutes at 50%. For DC battery strings we use Exide's constant-power discharge table: for example, the P12V875 delivers 301 W per block for 1 hour to a 1.80 V/C end voltage. We take the total wattage from your load list and calculate the battery quantity for the target runtime.

### Why an online double-conversion UPS?

In an online double-conversion UPS the input power is converted to DC and then back to AC; even in normal operation the load is fed from a conditioned sine-wave output rather than directly from the mains. The GXT RT+ operates over a wide 120–300 VAC input range (with power derating under certain conditions, per Vertiv). That is why we prefer the online topology for PBXs, servers and network equipment.

### How long do the batteries last, and when are they replaced?

Exide Sprinter P/XP batteries have a "Long Life 10–12 years" design life under the EUROBAT 2015 classification; this is a design class, and actual life depends on temperature, charging and discharge conditions. Datasheet values are given for 25 °C and the float voltage varies with temperature, so charging must be temperature-compensated (the GXT5 does this). We base replacement decisions on measurements and discharge tests; the GXT5 also predicts the battery replacement date.

### How is runtime extended with an external battery cabinet?

Each GXT RT+ model has its own cabinet (GXTRT-EBC24VRT2U … EBC72VRT2U). Up to 10 GXT5-EBC192VRT3U cabinets can be connected to the GXT5-5000; a single cabinet raises runtime from 7 to 19 minutes at full load and from 18.5 to 48 minutes at 50% load. The GXT5 detects the cabinets automatically and reports the remaining runtime correctly.

### Can the UPS be monitored remotely and shut servers down automatically?

Yes. The GXT RT+ uses a network card with SNMP and web access (LI38000B020), the GXT5 an IntelliSlot RDU120 card; both also support relay/dry contacts and USB/serial connections. Vertiv Power Insight is free, monitors up to 100 devices and offers automated server shutdown plus a vCenter, vXRail and Nutanix plugin. We can also forward the alarms to your existing SNMP monitoring system.

### How is a UPS sized for a PBX — VA or W?

Sizing is based on the load's wattage (W); a UPS's W rating is VA × power factor. The GXT RT+ 3,000 VA delivers 2,700 W, while the GXT5-5000 delivers 5,000 W at a 1.0 power factor. We add a margin to the total wattage of the PBX, switches and servers; the short-term overload limit on the GXT RT+ is 130% for 30 seconds and 150% for 3 seconds.

## UPS and battery quote

Just send us the list of equipment to be powered (or the total wattage), the required runtime and the installation type (rack, tower, DC system) on WhatsApp. We return a BOM and quote within 24–48 hours. Across Türkiye and in Turkmenistan.

- Request a quote: https://www.promark.tr/en/contact
- WhatsApp: https://wa.me/903125440915?text=Hello%2C%20I'd%20like%20a%20quote%20for%20a%20UPS%20and%20batteries.
- Call: +90 312 544 0915
- E-mail: destek@promark.tr
- Promark Dijital Teknolojiler Limited Şirketi — İvedikköy Mah. İvedik Cad. No: 245/38 06378 Yenimahalle / Ankara