I did some exploration around the Alpicool C20 and it appears to use at most 72Ah @ 12V per 24h, that's 864 watt-hours. I’d anticipate it to use a little below that because it gained’t be working the compressor https://sairaqqol521949.digitollblog.com/27273674/not-known-factual-statements-about-best-portable-power-station