Charge laptop: 45V charger 8 hours a day: 360Wh
Charge phone: 80Wh day x 3
All fans overnight: 24Wh per 12 hours of running (overnight) x 3 fans
All fans 24/7: 144Wh
Fridge: 12Vx3.38A = 48W == 1152Wh (worst case scenario running 70% of the time: 720Wh)
Freezer: 12Vx2.5A = 48W == 720Wh

calc 360+200+144+120+720+720

24V battery bank DIY cells: $840 https://www.aliexpress.com/item/4000303299745.html?spm=2114.12010612.8148356.22.48867190TbiWJF&aff_platform=link-c-tool&cpt=1578846113285&sk=pixtzdnE&aff_trace_key=7fe9893b9612479087f022c9538e0568-1578846113285-09503-pixtzdnE&terminal_id=48210173951f41f496764309a9d51047

BMS, wires, charge controller: $400
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Charge laptop: 45V charger 4 hours a day: 180Wh
Charge phone: 80Wh day x 3
All fans overnight: 24Wh per 12 hours of running (overnight) x 3 fans
All fans 24/7: 144Wh
RPi 3b+ ~ 120Wh day




calc 180+200+144+120