My son-in-law found this bank of batteries when he moved into his house. It was in the back of the garage with no hook-ups in sight. Any idea what it was for?
They didn’t have inverters like that back in the day. If they had backup power to the house it might have been a few lights that didn’t care if it was DC.
Phone exchanges had all kinds of batteries as they used DC and rooms and rooms of relay switches.
Those look like they could have been from an electric car or most likely a windmill kit.