Hey Wes, Good catch on the Stancor's coil rating. -- Mike "Rocket J Squirrel" Elliott 84 Westfalia: Mellow Yellow ("The Electrical Banana") 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano Bend, OR KG6RCR
On 3/17/2009 4:10 PM pickle vanagon wrote: > I know the stancor 120-901 relay is popular among listmembers for > dual-battery setups, so I ordered one when I was preparing to do my big > electrical project. > > I finally got around to looking at the detailed spec sheet, and see that the > relay is rated for 12v of coil voltage, and is suited to take up to 10% more > than that. (The spec sheet is here: > http://www.stancor.com/wrdstc/pdfs/Catalog_2006/Pg_052_53.pdf). Of course, > 10% more than that is just 13.2 volts, which is below what you'll see in > your van when driving around. In fact, at the bottom of the spec sheet, > Stancor has printed the warning: > "Note: Caution must be used in coil selection for use in 12 volt systems > where battery charging may expose coil to continuous, higher-than-rated > voltage. Stancor will not be responsible for consequences of misapplied > solenoids." > > So, is this relay not such a good choice after all? > > On the other hand, it seems they have another relay (120-914) intended for > automotive use and rated up to 15volts (its on the same spec sheet). If I > read the spec sheet, this will come online at 11.25 volts (75% of 15), which > should be fine. Maybe this is an acceptable choice? > > Thoughts? > -Wes > |
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