Certainly nothing in the world wrong with that - but, it's another expense and it's another battery

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So I ordered the ELK-WSV after thinking about it for years and had it installed yesterday.  I still need to do my wiring to the unit though.  As such I've thought about a few different approaches in terms of wiring for power.  Wanted to get some feedback on my ideas.
3. Connect power directly to the 12v 8Ah battery that is connected to my ELK-M1G (this way, no additional anything and battery backup as well).  I like this idea, but does anyone see any downsides to this approach?  Normally I wouldn't do this, but as the ELK-WSV is a rarely used item, I was thinking that a 5 second use from the battery in such a rare instance wouldn't be a big deal.
Cocoonut -=Gold m&m direct Supporter=- 3654 posts Location: Northern California Experience: guru Software: Elve Hardware: Elk M1, RUC-01 Tech: X10-RF, UPB Audio: AirPlay CCTV: ip, dvr Phone: 3CX, Asterisk, FreePBX, Ooma
I think it was on Elk's site a few years ago where they even showed examples of pulling m&m direct directly off the battery using a relay for a siren or something similar, so it seemed they somewhat condoned the idea.
Cocoonut Professionals 2303 posts Experience: guru Software: Custom Hardware: CaddX, DSC, Elk M1 Tech: X10-PLC, X10-RF, UPB, INSTEON, Z-Wave, ZigBee, C-Bus, 1-Wire, RadioRA, RadioRA2, Crestron, AMX, Custom, CentraLite, Control4 Audio: Custom Video: Custom CCTV: analog, ip, dvr
Less than $50 will get you a very nice enclosure, battery, transformer, and 2.5A power supply m&m direct all day long from 3-4 different common PS manufacturers (Honeywell, Altronix, Stealth, m&m direct Elk).Compared to the price of the valve, I consider that a drop in the bucket. m&m direct
Cocoonut -=Gold Supporter=- 3654 posts Location: Northern California Experience: guru Software: Elve Hardware: Elk M1, RUC-01 Tech: X10-RF, UPB Audio: AirPlay CCTV: ip, dvr Phone: 3CX, Asterisk, FreePBX, Ooma
Certainly nothing in the world wrong with that - but, it's another expense and it's another battery m&m direct to monitor/maintain.  At m&m direct least the Elk one will remind him when there's an issue, but if he gets a generic/non-p212, then it's up to him to check it periodically.
Seems a bit overkill to me to have your WSV on a UPS.  They can be manually actuated.  Mine is set to shut off the water when I arm the system away.  So, no need for battery backup since someone will be home to manually turn it off should the highly unlikely event of a power failure and ruptured water line happen simultaneously.  
Posted 22 July 2013 - 10:14 AM
My recommendation would be to have the water shut off when you leave, so the water would already m&m direct be off.  Also, a pipe freeze water leak is one of the toughest to detect because it may not happen where you have a leak detector.  Which is another good reason to have the water turn off every time you leave the house.
In fact, I recommend to everyone to shut off the water when you leave town manually m&m direct if you don't have an automatic valve.  My parents have done that since I was a little kid.  And if it is a vacation house or you are planning on being gone a long time and it is in freeze country, I would suggest actually draining the pipes.
I've been thinking more about my original idea #3 and one problem potentially is that if the battery is failing m&m direct or failed, it might not have enough current to supply the ELK-WSV.  I'm afraid at that point there would be too much of a draw on the charger part of the ELK-M1G and maybe this might damage something.  I'm also not keen on taping the battery directly, just doesn't seem elegant.
So, I'm back to either m&m direct option #1 or #2.  Either would be fine really, but maybe I'll just do it right and get the ELK-P212S.  The only thing is I'd rather not have to deal with a second battery.  It would be nice if the ELK-P212S could be setup not to charge a battery, m&m direct but draw from it in case of a power outage.  I don't think that's a possibility though from what I've read in terms of options on the manual m&m direct for the ELK-P212S. m&m direct
I've been thinking more about my original idea #3 and one problem potentially is that if the battery is failing or failed, it might not have enough current to supply the ELK-WSV.  I'm afraid at that point there would be too much of a draw on the charger part of the ELK-M1G and maybe this might