What are the guidelines for working around hydrogen?
So your charger didn’t shut off all night and you can hear all the batteries gurgling merrily, and you want to know how to NOT blow up the garage. The required concentration for an ignitable mixture is generally too high to generate from batteries charging in an open space in a garage, but the same might not be true for small spaces like battery boxes. Still, hydrogen is so combustible, that it behooves us to take every precaution. For battery boxes that are sealed relatively well, draw air out of them with a brushless design fan to the outside of the car while charging. This is only necessary if your boxes are closed and sealed, of course. For the garage, install a CO detector. CO detectors are very sensitive to hydrogen as well as CO. Wire the output to a latching relay instead of to (or in addition to) the piezo speaker that comes with the alarms. Use the relay to trigger a brushless garage vent fan to draw air out of the garage to the outdoors. This would require a manual reset by
