Loving outdoor life, I've used a lot of time to find out for how long my S9 will run on different 12V batteries. I ended up making two web calculators which may be helpful for other people. The first one is for the S9 alone, the other one for S9 with H5i humidifier and climate control. The calculators originally were published in Norwegian language. I've tried to translate into English, but I kindly ask the forum members to reply with suggestions for improvement. (I'm a better calculator maker than translator I think). First I post the link to my calculator for S9 "standalone", please give med feedback on mistranslations!