Ventilation Data

Submitted: Friday, Aug 29, 2003 at 23:47

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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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Reply By: Deleted User - Friday, Aug 29, 2003 at 23:49

Friday, Aug 29, 2003 at 23:49

I calculate I need two by 4.32 sq mm vents for my setup ..... Does that make the "one hole" I have at 12mm diameter work " ..... sure it doesnt !!!! But what do I know ........ I'm not a solar engineer ...... so the one barb ,with a plastic pipe to van exterior, that BTi did, must be fine .........Sigh !!! Anthony

AnswerID: 559489

Reply By: Deleted User - Friday, Aug 29, 2003 at 23:50

Friday, Aug 29, 2003 at 23:50

Anthony,
Ditto,ditto, ditto, amateurs, amateurs,
amateurs.
David

AnswerID: 559490

Reply By: Deleted User - Friday, Aug 29, 2003 at 23:51

Friday, Aug 29, 2003 at 23:51

Anthony
I know you intended to write 4.32 sq cm - not 4.32 sq mm - but just in case any gets confused ........
Collyn

AnswerID: 559491

Reply By: Deleted User - Friday, Aug 29, 2003 at 23:52

Friday, Aug 29, 2003 at 23:52

Woops !!! Your're right Collyn ..... missed it !!! It's all this packing for Cania and last minute jobs ...... Square Centimetres .... NOT Square Millimetres .... Lucky I didnt go for the .... siemens/henry/farad/coulomb..... type thingamybob !! Regards Anthony

AnswerID: 559492