1. What is the Honeywell ES 200X Battery Size Calculator?

This calculator determines the minimum battery capacity (in amp-hours) required for a Honeywell ES 200X fire alarm control panel based on its quiescent current draw and alarm current draw.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Panel Quiescent — Current draw in standby mode (amps)
• Alarm — Current draw during alarm condition (amps)
• 24 h — Required standby time (24 hours)
• 0.5 h — Required alarm time (30 minutes)
• 1.25 — Safety factor (25% additional capacity)

Explanation: The calculation ensures the battery can power the panel for 24 hours in standby plus 30 minutes in alarm, with 25% additional capacity for aging and temperature effects.

3. Importance of Proper Battery Sizing

Details: Correct battery sizing is critical for fire alarm system reliability. Undersized batteries may fail to provide backup power when needed, while oversized batteries may not charge properly.

4. Using the Calculator

Tips: Enter the panel's quiescent current (typically found in specifications) and alarm current. Values must be in amps (A) and non-negative.

5. Frequently Asked Questions (FAQ)

Q1: Where do I find the panel's quiescent current?
A: Check the Honeywell ES 200X technical specifications or installation manual for quiescent current values.

Q2: What if my panel has multiple alarm currents?
A: Use the highest alarm current that would be drawn during any single alarm condition.

Q3: Why is there a 1.25 multiplier?
A: The 25% additional capacity accounts for battery aging, temperature effects, and other variables that reduce actual battery capacity over time.

Q4: Can I use a larger battery than calculated?
A: Yes, but ensure the charging circuit can properly charge the larger battery within the required time (typically 24-48 hours).

Q5: How often should batteries be replaced?
A: Fire alarm batteries should typically be replaced every 3-5 years, or when capacity tests indicate reduced performance.