[RE-wrenches] Off Grid Alarm Communicator

[maverick at mavericksolar.com]

Carl,

Alarm systems typically already have batteries. Usually 9 or 12 Ah VRLA. 

For an off-grid version, I would size the battery based on the once a year event where the alarm is going off non stop for two days. That should also give some cloudy weather storage. 

If possible, get all their equipment and set it up on a bench to make actual power and energy measurements.

Of course, for such a small system it might be ok to use the name plate rating, etc. Unless they are really budget contrained.

I would put another battery box next to the alarm box for the larger battery and the OCPs and charge controller.

I really like the Morningstar SunSaver MPPT 15A controller. The extra price over a PWM controller gives you data logging, software upgrade ability and of course MPPT.


Thank you,

Maverick


Maverick Brown
BSEET, NABCEP Certified Solar PV Installer ®
President & CEO
Maverick Solar Enterprises, Inc.
Office:     512-919-4493
Cell:        512-460-9825

Sent from my HondaJet!

On Nov 24, 2011, at 6:29 AM, Carl Adams <swingjunkie at gmail.com> wrote:

> Hello Wrenches,
> 
> I had a request from a local alarm company for a small PV - Battery
> system to power an alarm communicator system.  The parameters given
> are as follows
> 
> 12 V DC power supply to the gear
> standby load 28 mA - this is the majority of the time
> Operation peak load 2A for 2 minutes - once per day for communications
> check and as required for alarm condition report
> 
> Have any of you provided such a system and if so could you share your
> recommendations for a cost effective solution.
> 
> With Regards
> Carl Adams
> SunRock Solar
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