larryllix Posted August 8, 2014 Posted August 8, 2014 (edited) Now you got me thinking! A 9v (NiMH?) battery with a trickle charger running the CAI board could make a good UPS backed system. or even a dioded-in 9v alkaline battery for grid failure carry over? OTOH: When the grid is out not much else is functioning. Edited August 8, 2014 by larryllix
Teken Posted August 8, 2014 Author Posted August 8, 2014 The energy still has to come from somewhere and the device linked to doesn't store or produce power. Again if you are considering running the CAI off a 9v battery it should last about an hour. We haven't touched the Peukert factor. The main SWE3 sensor chip is the DS2438z chip rated at 50-100uA but even a 10K pullup is going to draw 0.9mA not to mention the HIH-40xx humidity sensor. With a 2mA draw you could expect about 250 hours= 10 days out of a 9v battery rated at 500mAh .http://datasheets.maximintegrated.com/en/ds/DS2438.pdf Now you got me thinking! A 9v (NiMH?) battery with a trickle charger running the CAI board could make a good UPS backed system. or even a dioded-in 9v alkaline battery for grid failure carry over? OTOH: When the grid is out not much else is functioning. All good questions and considerations for sure. I apologize if I didn't explain what I planned to use to power the other end of the device listed. As you guessed I may very well use one of three possible solutions which are simply based on my desire to deploy one over the others. I could go with a high output rechargeable 9 volt battery. As you indicated it would be tied to a trickle charger long term. Another is powering the device with a massive Optima Yellow Top 12 volt car battery! This too would be placed on a battery tender trickle charger for long term use. The last option is to use one of 30 APC 12 volt battery cells I have stocked piled. The last two obviously would provide enough power for months if not an entire year with out issue. The last option is taking any of a dozen power supplies I have laying around and powering the devices. The only reason I wanted to go with the 9 volt battery was to consolidate the entire package and simply run a power line to keep the system charged. I am open to suggestions no matter how ugly or elegant! Thats why its call a project and trial and error.
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