I remember looking into solar some 20 years ago. 5kWh battery bank was practically unheard of and iirc correctly was roughly $1k per kWh. Hopefully somebody with the time can come and correct numbers. Today you can find 5kWh battery banks for ~$2k.

Inverters I remember being about $5k-$10k for house sized and capable of running AC unit. Today roughly $1k-$2k.

Solar panels themselves I've not priced, but iirc I remember large arrays being $20k-$30k or more.

The cost to DIY a whole home off grid solar and battery bank system has gotten beyond easier, safer and an absolute fuck ton cheaper