Hi,
I thought it was interesting that it was the two batteries I had connected directly to the power, and none of the middle three. Random chance I guess. Thought it could mean something.
Yes, the maximum charge is 150 volts. That is why the batteries popped. I thought I could run it like that for a while to test. I guess not!
I now calculate the maximum voltage I could have put into those batteries is 69 volts, being 13.8 x 5.
When I rebuild the bank, I will set the charge limiter at around 69 volts.