I really appreciate your time and kindness in answering me
Yes, I have heard your recommendation to use EV batteries, but sometimes they are a bit difficult to get or I don't know where they can be found.
I feel very happy with just one day in this forum, the professional and educated way to answer people like me who are not experts or professionals in the energy sector.
To be more exact, my need is 70amp x 12 hours of continuous work at 48 volts.
Using the formula that you sent me, it would be...