UPS Battery Sizing Guide 2026: Calculate Runtime, Capacity, and Never Under-Spec Again

A UPS system is only as good as its battery bank. Get it wrong and you either overspend or leave your critical equipment exposed. This guide gives you the exact formulas to size any lead-acid UPS battery correctly — with a worked example you can use immediately.

Why UPS Battery Sizing Goes Wrong

The most common sizing mistake: engineers use the UPS’s rated VA or kW as the load, then divide by the battery voltage to get Ah — without accounting for the inverter efficiency, the battery’s discharge characteristics, and the desired runtime.

The result is batteries that last 18 months instead of 5 years, or UPS systems that deliver 8 minutes instead of the 30 minutes required for orderly shutdown.

The Correct Sizing Formula

Step 1: Establish the Actual Load

True Load (W) = UPS Capacity (VA) × Power Factor × Utilisation Rate

Example: A 10kVA UPS with 0.8 power factor running at 70% load:

True Load = 10,000 × 0.8 × 0.70 = 5,600W

Step 2: Account for Inverter Efficiency

Effective Load (W) = True Load (W) ÷ Inverter Efficiency

Most UPS inverters operate at 88–94% efficiency. Use 90% as a conservative estimate:

Effective Load = 5,600W ÷ 0.90 = 6,222W

Step 3: Calculate Required Battery Capacity

Battery Capacity (Ah) = (Effective Load × Runtime hours) ÷ (Battery Voltage × DoD Limit)

For lead-acid UPS batteries, limit Depth of Discharge to 50% to maximise cycle life:

Battery Capacity = (6,222W × 0.5 hours) ÷ (480V × 0.50)

Battery Capacity = 3,111Wh ÷ 240V = 12.96Ah → Round up to 20Ah 

For a 480V system (standard for large UPS), this requires a 40-cell string at 12V per cell.

Step 4: Calculate the Number of Battery Strings

Number of Strings = Required Capacity ÷ Selected Battery Capacity

If using 12V 100Ah batteries (each battery = 100Ah at the 10-hour rate):

Number of Strings = 12,960Wh ÷ (12V × 100Ah × 0.90) = 12,960Wh ÷ 1,080Wh = 12 strings

Runtime Estimation Formula

Once battery capacity is determined, estimate actual runtime:

Runtime (hours) = (Battery Ah × Battery Voltage × DoD × Inverter Efficiency) ÷ Load (W)

Example: 100Ah, 480V battery bank (40 × 12V batteries) at 5,600W load:

Runtime = (100 × 480 × 0.50 × 0.90) ÷ 5,600W

Runtime = 21,600Wh ÷ 5,600W = 3.86 hours 

Temperature Derating — The Factor Most People Miss

Battery capacity decreases as temperature rises above 25°C. For every 1°C above 25°C, lead-acid capacity decreases by approximately 0.6% per hour.

If your UPS battery room operates at 35°C:

Derating Factor = 1 - (10°C × 0.006) = 1 - 0.06 = 0.94

Adjusted Capacity = 100Ah × 0.94 = 94Ah 

CHISEN UPS AGM batteries are rated for operation up to 40°C with published temperature derating curves — demand these curves from your supplier.

Battery Type Selection for UPS Applications

| Factor | Flooded Lead-Acid | AGM VRLA | Lithium LiFePO4 | |—|—|—|—| | Typical life (25°C, 50% DoD) | 8-12 years | 5-8 years | 10-15 years | | Cycle life at 50% DoD | 1,200-1,500 | 600-900 | 4,000-6,000 | | Maintenance | High (watering) | Low | Minimal | | Initial cost | Low | Medium | High | | Best for | Large facilities, budget | Standard UPS rooms | Critical infrastructure | | Float voltage | 2.25–2.28V/cell | 2.25–2.30V/cell | 54.4V for 48V system |

Common Sizing Mistakes and How to Avoid Them

Mistake 1: Sizing for Full Load Never size batteries for the UPS’s maximum rated load. Most UPS systems run at 40–70% of rated capacity. Always ask the customer for actual or estimated load.

Mistake 2: Ignoring Battery Age Battery capacity degrades. A 3-year-old battery bank at 80% capacity should be sized for the degraded capacity — not the original rated capacity.

Mistake 3: No Temperature Consideration Battery rooms in hot climates (Middle East, Southeast Asia, South Asia) require derated sizing. Always specify batteries rated for the actual operating temperature.

Mistake 4: Mixing Old and New Batteries Never add new batteries to an old bank. The new batteries will be dragged down by the older, weaker cells. Replace the entire bank or keep the old and new strings electrically separate.

CHISEN UPS Batteries

CHISEN Battery supplies AGM VRLA and flooded lead-acid batteries for UPS applications globally:

• Capacity range: 7Ah to 250Ah per unit, configurable for any UPS voltage (24V, 48V, 120V, 240V, 480V)
• Certifications: CE, ISO9001, UL available
• Float life: 10-12 years at 25°C (AGM series)
• Temperature range: -20°C to +40°C (standard), -40°C to +60°C (special order)
• Custom configurations: Available for OEM projects

Contact: jack@chisen.cn | WhatsApp: +86 131 6622 6999 | www.chisen.cn