Almost finished with the electrical portion of our '79 Airstream Excella 500 renovation and I'm at the point where I'm considering a few different options for venting the battery box.
I have 4 Duracell EGC2 6V wired in Series-Parallel that I need to vent. The position of the battery box is just behind the driver-side axel (don't worry, I'm keeping track of balance and tongue weight ) and there's no built in vent nearby (closest is fridge vent 6 feet away). Due to the construction of the cabinets around the battery box I don't have the ability to have a continuous up-sloped vent hose leading to the outside (up-slope needed to vent lighter-than-air fumes resulting from charging flooded batteries). Instead of using a passive venting system I've decided to go the "active" route by placing a small fan inline with the vent hose to force the air outward.
The accomplish this "active" venting setup I need someway to tell the fan to turn on when the batteries are charging. Because I'm using an all-in-one inverter/charger I can't just connect the fan to the power charge line (since it's powered all the time whether the charger is one or not). Also, the combo unit I have doesn't have any sort of connection that's only powered when the charger is running. The only way to know that the combo unit is charging is an LED that lights up on the unit itself.
As far as I can see, I have 4 options to turn on the fan when the batteries are being charged.
So here's my question... If you do "Active" venting in your AS (passive isn't an option for me), which method do you use? One of these, or something else?
By the way, I'm using very low power, very silent fan (less than 20db, which is less than a whisper).
I have 4 Duracell EGC2 6V wired in Series-Parallel that I need to vent. The position of the battery box is just behind the driver-side axel (don't worry, I'm keeping track of balance and tongue weight ) and there's no built in vent nearby (closest is fridge vent 6 feet away). Due to the construction of the cabinets around the battery box I don't have the ability to have a continuous up-sloped vent hose leading to the outside (up-slope needed to vent lighter-than-air fumes resulting from charging flooded batteries). Instead of using a passive venting system I've decided to go the "active" route by placing a small fan inline with the vent hose to force the air outward.
The accomplish this "active" venting setup I need someway to tell the fan to turn on when the batteries are charging. Because I'm using an all-in-one inverter/charger I can't just connect the fan to the power charge line (since it's powered all the time whether the charger is one or not). Also, the combo unit I have doesn't have any sort of connection that's only powered when the charger is running. The only way to know that the combo unit is charging is an LED that lights up on the unit itself.
As far as I can see, I have 4 options to turn on the fan when the batteries are being charged.
- Connect the fan to the Shore Power breaker, so whenever I'm connected to shore power (and therefore, charging since the combo unit charges the batteries whenever shore power is connected) the fan would turn on. I'm adding solar in the future, so I'm not sure how I'd ensure the fan is one when solar is charging the batteries.
- Use a manual switch to turn on/off the fan that I'd have to flip every time the batteries are charging. This options sucks.
- Use a "Photoelectric Switch Sensor Relay " which would detect when the "charging" LED is lit on the combo unit and subsequently turn on/off the fan.
- Use a "Voltage Sensitive/Sensing Relay" (VSR) that turns on at 13.4v and turns off at 12.9v.
So here's my question... If you do "Active" venting in your AS (passive isn't an option for me), which method do you use? One of these, or something else?
By the way, I'm using very low power, very silent fan (less than 20db, which is less than a whisper).
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