Jul 15, 2025

How to Choose the Right Battery Rating and Quantity for UPS on GeM

How to Choose the Right Battery Rating and Quantity for UPS on GeM

How to Choose the Right Battery Rating and Quantity for UPS on GeM

Battery sizing can make or break your GeM bid for UPS systems. This article helps you understand how to select the correct battery configuration for 1–10 KVA Online UPS models, with real-world configurations based on actual use cases and tender-winning patterns.

Why Battery Configuration Is Non-Negotiable in UPS Bidding

For most GeM buyers—especially from PSUs, government departments, and educational institutions—the tender document will not only ask for the UPS rating but also specific backup duration and minimum VAH (Volt-Ampere-Hour). If your battery selection doesn’t match this, your bid might get rejected at the technical stage.

What is VAH?

VAH = DC Bus Voltage × Battery Ah × No. of Batteries
This figure helps buyers estimate how long a UPS will support a load. For example:

A 240V DC UPS with 12 batteries of 100Ah each = 240 × 100 = 24,000 VAH

Tenders will often specify: “Minimum VAH must not be less than 24,000 for 2-hour backup on 10 KVA UPS”—making accurate battery selection critical.

Battery Selection Factors You Can’t Ignore

UPS Rating & DC Voltage
Every UPS rating is designed with a specific DC bus voltage (like 180V, 192V, or 360V). Your battery configuration must match this.

Backup Duration
Short runtimes (15–30 minutes) need fewer or lower Ah batteries. Extended runtimes (2–4 hours) require higher Ah and quantity.

Battery Make & Certification
Always use BIS-certified makes. They're not just trusted—they also pass compliance audits in GeM procurement.

Matching Runtime with VAH
Overshooting VAH slightly gives you buffer room, especially for long-term battery degradation.

GeM Portal Checks
Before you upload your technical bid or product listing, cross-check your battery VAH calculation using the GeM formula (also mentioned in many tender templates):
VAH = 1600 × KVA × Backup Hours

Recommended Battery Configurations by UPS Rating


UPS Rating (KVA)

Backup Time (min)

Battery Rating (Ah)

Battery Quantity

1

15

7

3

1

30

26

3

1

60

45

3

2

30

26

6

2

30

18

12

2

60

26

12

2

90

26

16

2

120

45

12

2

120

42

13

2

180

65

13

2

240

85

13

3

30

26

8

3

30

18

12

3

60

26

16

3

90

42

15

3

120

65

13

3

180

100

12

3

240

100

16

5

30

28

12

5

30

26

13

5

60

42

16

5

60

45

15

5

90

65

16

5

120

85

14

5

120

100

14

5

180

130

16

5

240

100

28

6

30

28

15

6

30

26

16

6

60

65

13

6

90

100

12

6

120

100

16

6

180

100

24

6

240

100

32

7.5

30

42

16

7.5

60

65

16

7.5

90

100

15

7.5

120

65

32

7.5

180

100

30

7.5

240

130

32

10

30

42

16

10

60

85

16

10

90

130

16

10

120

100

28

10

180

130

32


How to Read and Use the Table

UPS Rating (KVA): The nominal capacity of the UPS system.

Backup Time (min): How long the system can support load with the given batteries.

Battery Rating (Ah): The capacity of each battery. More Ah = more backup time.

Battery Quantity: Number of batteries needed to meet both voltage and runtime requirements.

This table gives real, proven combinations that align with tender requirements. Whether you're configuring a 2 KVA UPS for 1 hour or a 10 KVA system for 4 hours, these combinations ensure you’re technically compliant.

Top Mistakes to Avoid While Bidding on GeM

❌ Quoting low Ah batteries for long backup time — even if the voltage matches, the runtime won’t.

❌ Using fewer batteries than required by the UPS’s DC bus voltage — this can cause functional failure or bid rejection.

❌ Submitting bids without brand-specific battery documentation — many tenders need clear make and model details.

❌ Ignoring VAH requirements in favour of just KVA and hours — the tender will evaluate VAH, not just theoretical runtime.

Final Thoughts: Build Technically Sound Bids, Not Just Competitive Ones

If you’re bidding or listing UPS systems on GeM, your pricing, branding, and certifications matter — but not without a technically accurate battery design. A well-structured battery plan with a correct VAH calculation is the foundation of any successful tender.

Paradyne has helped hundreds of GeM bidders and dealers secure wins with proper UPS and battery sizing. With 28+ years in the industry, BIS-certified products, and in-house engineering support, we ensure you don’t just list—but win.

Let’s keep your systems running—no interruptions.

Let’s keep your systems running—no interruptions.

Let’s keep your systems running—no interruptions.