500W charging board

[Pete Ashby]

Four pictures to follow:
I picked this up some years ago because it seemed like a good idea at the time and it promptly went into the back of the workshop. Well it's just come out into the light of day again.

The plates say it's a 500W charging control board, the question I have is:

How old is it (no date on any of the plates)?
Who made it and where?
Was it vehicle or bench mounted?

The finish seems to be DTB

Over to you guys

Thanks

Pete