Battery Shed help

[eben]

Hello,

I'm having a problem with a battery shed and I'm looking for some help.
I would like to put some batteries into a 8 x 8 shed. The problems is the client I'm working with doesn't want to install a hydrogen monitor meter because the site is away from the city and they will not have anybody around to calibrate or maintain it. So, I was planning on installing a vent to continually run and vent the room. However I remembered the temperatures can drop down to below freezing which is not recommended for the batteries, thus a vent always running would not be ideal.


Any suggestions on this problem?

 

[brian john]

Flooded Lead Acid?

Temperatures in sheds run both directions high temperatures, shorten the battery life, cold temperatures impact available capacity.


What good is a detector if no one is around? Tree falls in the woods sort of thing. If it is tied to an alarm system then it could be checked if bad by the site tech. Order two one goes bad install the spare, little or no hassle for the site tech (I assume that the batteries support something and this equipment needs to be checked by someone)?

Does the site have HVAC system?

Option could be use a fan tied to a temperature sensor on the cells. Most off gassing in my experience has been tied to run away cell voltage and excessive cell temperatures.

 

[russ__20000]

Most off gassing in my experience has been tied to run away cell voltage and excessive cell temperatures.

Recharge causes gassing. This occurs everytime the power goes out and comes back on.

 

[dereckbc]

Most off gassing in my experience has been tied to run away cell voltage and excessive cell temperatures.

Brian that is true with respect to Valve Regulated Lead Acid batteries only. So that part is true that VRLA only gas when in thermal run-away or excessive charging which causes excessive cell temps. They do not gas under normal recharge conditions.

Flloded batteries gas when recharged or over charged.

Anyway on to the question at hand.

If this shed is not part of an occupied building in a remote area, there is no requirement to ventilate or have a monitor. Even if it is in something like a high rise building it may not be nessecary to ventilate if the room has HVAC and meets the minimum required number of air exchangers per hour or uses VRLA technology.

Now with that said the word shed conjurs up images of a leaky, drafty, and cheaply constructed building where it would be impossible for any hydrogen to build up. Also keep in mind batteries have to be on a charger to gas, and have to be recieving a charge current in excess of float.