BATTERY LIFE EXPECTANCY

Valve Regulated Lead Acid (VRLA) Batteries
Overview:

The most common type of battery used on UPS systems and for backup of telecommunications systems. VRLA batteries are designed to be maintenance free and the hydrogen that is emitted is recombined internally so that the electrolyte does not need replacing over the life of the battery, a valve is installed to release any excess pressure that may build up if the battery were failing. 

Plate thickness in this type of cell is determined by the application it is used in; long discharge durations require a thicker plate than high power rapid discharges which require thin plates.

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Battery Backup Calculation

Calculating Battery backup:

Step 1 : Determine the power drawn from the batteries in watt.

Battery Power = (kVA x Power factor) / UPS Inverter efficiency


Step 2 A : Determine the watt per block (If this is the information used by the supplier)

Watt per block = Battery Power / (Number of 12v Blocks used in UPS / Battery strings)

compare this figure to the watt tables supplied by the supplier. If the watt per block value is too high then increase the number of battery string until a suitable figure obtained. The use of more than 4 parallel battery string is not advisable

Step 2 B : Determine the watt per cell ( if this is information used by the supplier)

Watt per cell = Battery Power / (Number of cells used in UPS / Battery strings)

compare this figure to the watt tables supplied by the supplier. If the watt per cell value is too high then increase the number of battery string until a suitable figure obtained. The use of more than 4 parallel battery string is not advisable

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UPS SYSTEMS WITH LITHIUM-ION BATTERIES

UPS Systems with Lithium-Ion Batteries can be the perfect choice for your three phase UPS. Lithium-ion batteries offer several advantages over traditional valve-regulated, lead acid batteries commonly used in UPSs today.

UPS Systems with Lithium-Ion Batteries Benefits
Normal battery voltages are 2.25 volts per cell or 13.5 volts DC for a “12” volt battery. Battery voltages under charge should be 13.5 volts on average for all batteries. After isolation, the open cell (non-charging state) should be slightly lower than 13.5. These readings are recorded and any discrepancies are noted. Depending on the size of the battery, the voltage will drop to 11 volts or so under load. All battery voltages under load are recorded.

Longer life expectancy:
Lithium-ion technology can double or triple battery service life, reducing the risks of downtime or load interruption during maintenance or replacement. Lithium-Ion batteries also offer up to 10X the cycle life of VRLA batteries.

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STANDARD WARRANTY TERMS & CONDITIONS for UPS & BATTERIES

KOMAX GENERAL TRADING & CONTRACTING CO. does hereby warrant that the UPS & Batteries will be free from defects in spare parts & workmanship from the date of Installation.

Any defects or deficiencies that occur within the warranty period will be repaired or replaced, as needed and in a manner, at no cost to the client.

Warranty Termination:

• All warranty obligations are terminated when the UPS is operated outside specification and/or the published Komax operating instructions;
• All warranty obligations are terminated when a customer or their sub-contractor or associated company makes any modification to the UPS that has not been recorded on a case by case basis with Komax and approved by the technical department
• All warranty obligations may be terminated should site or load or third party supplied UPS accessories be found on inspection by Komax to be damaging the UPS or causing operation that could reduce its working life

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