We have one of these.....can't answer your question though. Try emailing the picture to Sterling they will advise.
I have one of these:
It doesn't appear to look like anything on the Sterling web site or anywhere else for that matter.
Does anyone else have one? If so do you have a manual for it?
What I'd really like to know is whether it has a starter battery charging circuit or not.
Don't hook your solars through it though the solar controller is pants.