> I want to find a simple low-voltage alarm to add, too. I built mine out
> of parts I found in the junk drawer here, so I'm no help. Does anyone
> know of a cheap and cheerful off-the-shelf alarm?
well not cheap but its a solar charge controller & LV cutoff & overcharge
protector
ProStart 30 http://www.morningstarcorp.com/products/ProStar/index.shtml
I have it in for a year & does the job
its a digital dc meter , lvm & charge controller all in on1
$175
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150082020686