Heat emission from a lead acid battery?

You mean like under the hood of a car?

If the cabinet is totally enclosed build up of gases from battery may ignite if exposed to spark from electronics. All so gases will tend to increase corrosion of cabinet and electronics. Special coatings on both will help.

Recommend some type of ventilation.

increase corrosion of cabinet and electronics.

Yep!

Heat: WHere is heat coming from- Battery's internal resistance? During chargiing? How much resistance of electronics?

How much current drawn?

milo

Heat causes acceleration of gassing off. Good for the salesman, bad for the owner.

I would suggest that you use a battery that has vent hoses connected to the top of the battery and vent out to the bottom of the cabinet. This system is used in some Volvo station wagons, when the battery is located in the back, or spare tire location inside the vehicle. This eliminates battery fumes inside the vehicle and corrosion.

Gary

All 5 previous posts give appropriate advice. I concur - you may have increased heat output, this will lead to potential corrosive vapor discharge, and the battery charging cycle (unless it's a sealed unit) will give off hydrogen which could build up to an explosive mixture. Ventilate, isolate, and corrosion-proof everything in sight. Or replace it all frequently...

Unfortunately this is a common practice in many telecomm, and control panel applications, as previously stated at the bare minimum you need exhaust fans at top of cabinet, and vents at bottom.. The batteries will produce hydrogen when discharging and recharging, but will not vent under normal float conditions.

You also must make sure the area where the panel is located is air conditioned, if not your batteries life will be less than half of design, specifically valve regulated lead acid (VRLA) type.. Some batteries are less susceptible to heat, and should be confirmed with manufacturer.