We hope this calculator is as useful to you as we have found it to be to us. Please use this calculator as many times as you want. Please UN-TICK the boxes at the bottom if you do NOT want us to make contact with you.

Your name

Your project name (optional)

Your phone number (optional)

Battery type and charging method VRLA-Float VRLA-Boost VLA-Float VLA-Boost NiCd-Float NiCd-Boost

Number of cells in series (no. of cells per string)

Rated capacity of each cell/block/string (Ah)

Number of parallel strings

v = hydrogen dilution factor (maximum allowable % of hydrogen in air) 1% 2% 3% 4%

q = hydrogen release rate 0.00042 0.00045

s = Safety factor 5 10

Battery room length (m)

Battery room width (m)

Battery room height (m)

Volume that the batteries occupy in the battery room

Nominal voltage of battery

n = Total number of cells

I_gas = current producing gas during charging (A / 100Ah)

c_n = rated capacity of the whole battery (Ah)

Rate of hydrogen production (m³ / hr)

Total volume of the battery room

Net room volume

Estimated % of hydrogen in the un-ventilated battery room after recharging the battery

Q = minimum ventilation air flow rate (m³ / hr)

% of air in battery room required to change per hour

Area of aperture required to vent hydrogen naturally (cm²)

Diameter of aperture required to vent hydrogen naturally (cm)

Email address (to receive a copy of your results)

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