I did some research over the Alpicool C20 and it appears to make use of at most 72Ah @ 12V per 24h, that's 864 watt-hrs. I’d anticipate it to implement a bit lower than that as it gained’t be jogging the compressor https://gerardkiuj287486.answerblogs.com/30677210/examine-this-report-on-best-portable-power-station