Why use a battery box ventilator?


• Positive venting of hydrogen gas.
• Stops back drafting.
• Puts the smell outside.
• Keeps batteries warmer in cold climates.
• Keeps the battery tops and terminals cleaner.
• Uses very little power.
• Excellent results for over 15 years.

The battery box ventilator was designed for use in remote power systems. The concept arose from field experience of systems with enclosed battery boxes. Quite often Code required venting was found back drafting, thus cooling the battery bank and lowering its’ capacity as well as venting hydrogen gas into the structure.

The battery box ventilator alleviates this condition by keeping a gravity operated damper closed within the vent pipe except at times when the batteries are being charged and producing hydrogen gas. During these times the battery box is force vented with a low power, sparkless fan which overcomes the damper sending the gas outdoors. The “fan on” mode is determined by the battery voltage. When the batteries are “gassing” during charge periods the battery voltage will read above normal. A voltage sensitive switch is required in the system to make the on/off determination. Some inverters and charge controllers have a programmable auxiliary relay which can control the battery box ventilator. Other systems may require the addition of a voltage controlled switch.

The battery box ventilator is designed around typical home power systems with battery banks under 2,200 amp hours and charge rates under 150 dc amperes. Systems larger than this can produce more hydrogen gas than the expel rate of the battery box ventilator which operates in the 5 to 8 cubic foot per minute range. Two vents may be used for higher volume.




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HES PV Telephone: 866.258.0110