Ventilation Data

The following may be of interest.

Whilst pertaining more to fixed installations the Sustainable Energy Institute of Australia recommends the formula below to establish minimum ventilation sizes for battery enclosures.

A (cm.sq) = 0.006 x n x I.

'n' - = number of battery cells (note cells not batteries)
I = maximum probable charge rate in amps.

For example: (say) two by 12 volt batteries = 12 cells
Charge rate maximum (say) 70 amps

0.006 x 12 x 70 = 5.04 sq cm

Thus two slots one at the top, one at the bottom, each
a bit over 5.0 cm by 1.0 cm are indicated by the above.

Note these are minimums - it would seem prudent to double this.
Collyn Rivers


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