The battery must be type-tested and certifiedin accordance with NF C 58-510 "Lead acid secondary batteries for storing photovoltaically generated electrical energy",and/or IEC 60896-1 or -2 "Stationary lead-acid batteries - General requirements and methods of test.
Yes, a shipping container can be fully powered by solar energy, especially when equipped with a sufficient battery bank and properly sized solar array. Off-grid systems are capable of running lights, tools, computers, and even climate control systems depending on the configuration.
Current pricing runs €800-1,000 per kWh installed – a 10kWh system totals €8,000-10,000 before grants. Which simply means payback in 3-5 years at current electricity.
A 50–80 mm layer across walls, roof and floor prevents cold bridges, suppresses condensation and stabilises battery temperature for longer cycle life. Sandwich lightweight aluminium-zinc sheets around a non-combustible core (UL 94 V-0).