## Battery ventilation

### Battery ventilation

Input Result
Thinning factor v=
Generated hydrogen q= *10-3 m3/Ah
Safety factor s=
Number of cells n= pc
Capacity C Ah
Gas generating current Igas= mA/Ah
Flow Q=
Min area A= cm2
Safety distance d=

### Gas generating current

Indata Resultat
Float-/boost charge current Ifloat/boost= mA/Ah
Gas discharging factor fg=
Safety factor fs=
Current that generates gas Igas= mA/Ah

### Thinning Factor

A factor that indicates how large the necessary dilution of the hydrogen is and is determinable as below:

(100% -4%) / 4 = 24%

### Generated Hydrogen

The amount of hydrogen generated per Ah.

### Safety Factor

A general safety factor.

### Number of cells

The total number of cells in the battery or batteries.

### Capacity

Refers to the rated capacity of the battery. For lead-acid batteries comes 10h capacity while nickel-cadmium (NiCd) batteries are the 5h capacity as said used in the calculations and in both cases, it is at 20 ˚ C

### Gas generating power

The current that the charge gives rise to vätgs formed.

### Flow

The computed flow needed for the hydrogen concentration should be less than 4%.

### Min area

The minimum clear area for input repsektive emissions required for natural ventilation.

### Float-/boost charge current

If data for Ifloat och Iboost are missing can table below with the data used to determine Igas.

Free ventilated lead acid batteries (Sb < 3%) Valve regulated lead batteries NiCd batteries vented cells
Gas discharging factor fg 1 0,2 1
Safety factor fs 5 5 5
Float voltage ufloat 2,23 2,27 1,4 V/cell
Float current Ifloat 1 1 1 mA/Ah
Current Igas 5 1 5 mA/Ah
Boost charging voltage uboost 2,4 2,4 1,55 V/cell
Boost charging current Iboost 4 8 10 mA/Ah
Current Igas 20 8 50 mA/Ah

Float-/boost charge current increases with increasing temperature. The values ​​in the table above apply up to about 40 ° C

Used recombinant cell valves are the gas-generating current I gas is reduced to 50% of the ventilated cells.

### Gas discharging factor

One factor that shows some of the power of a fully charged battery that generates hydrogen gas.

### Safety factor

Safety factor takes into account the Old or faulty cells in the battery.

### Safety distance

Displays the distance from the batteries where the dilution of the hydrogen gas to a safe level can be considered significant. The distance may vary depending on the battery manufacturer's safety calculations or measurements.