https://rokslide.com/forums/threads/arken-epl-4-4-16x44mm-field-eval.301668/
Form did an evaluation of this one. Looks like it passed the 18" and left/right 36" drops and partially passed the single top drop. Things shifted after the 9x 36" drops and then it had trouble holding zero after that...
Shot a nice sized doe in 2022 at about 60 yards. She did a 30 yard death run and down. My daughter shot a button buck this year at about 40 yards. Buck kicked, ran in a circle, stopped and stood there for a few seconds, and tipped over. No fuss no muss. Both were shot using 123 eldm. Complete...
Like @Titan said, the most efficient machine to run on a battery is one that uses an input of 12V. All CPAP machines use DC, but not all are 12V. Look at the box on the power cord that came with the machine and see what the output is. Here is one from a Resmed airsense 10.
The box converts 110V...
Turn off all unnecessary functions (humidifier, Bluetooth/WiFi) and get a machine that uses 12v and doesn't convert from 12v to something higher. Capacity is lost when converting power.
Pretty good discussion here:
https://rokslide.com/forums/threads/cpap-anything-new-for-backpacking-camping.259798/
I went with a Breas Z2 auto and the Renogy 7200 mah battery. Used it at 11,000 feet and after the 4th night the battery still showed 50%. Could have gone longer but I switched...