I can see both sides of this, and here is my take -
SEVA is the Seattle chapter of the Electric Vehicle Association. The main topic is of course EVs. It's ok for members to sometimes chat about similar interests - be it Solar, recycling, microhydro or wind power. This is a rather geek heavy group of folks, and they do more than drive cars. That being said, the "off" topic or ones with very little interest, should be limited in scope and fall under one of the related categories already existing or be placed in the general category. That's what it is for. If someone is looking for detailed information on how to reprogram an outback charger controller, they will likely have better luck in a solar / off grid type of forum...but it's still okay to pose the questions / ideas here - mainly because of the intent of putting in an EV.
If you ask me, we already have PLENTY of categories. There are two that seem appropriate, but still have no posts in yet:
Electric Motorcycles and other unique high speed vehicles.
EV Racing and the National Electric Drag Racing Assoc (NEDRA)
IMHO, I think we should atleast put the electric bikes & electric motorcycles / other unique vehicles in the same category.
The thing I love about forums and deciding categories, is that it is a self regulating sort of system. You can ask for a whole new category, but if there are no posts for it already, it's probably not gonna happen. If we get lots of posts in general that seem to be related to a specific area, we would certainly consider creating a new category for it.
To summarize, we can chat about stuff that is related, but it does not always need a new category - and I like this topic, but don't think it is worthy of it's own category on this forum.
THose topics except hydro were the rage on the EV mail list several months ago.
This is one of the main reasons why I had dropped from the list when I got busy - I didn't have time to deal with all the emails, and they are intersting to me (some of them), but again, I'm not signed up for solar / wind / etc....I would like to see 90% of all SEVA be EV related, and not OT. I am back on the list now I am back from vacation etc - but I still have hopes of swaying more folks to use this forum to get their opinions out - and heard. It's a great place to have a discussion.