Eneloops would only last about 3 weeks. And disposable last 2 months. This door is used a lot and since it has Zwave and a door open sensor it sends info on every open.
Bonus, since it can handle the lipo AA batteries that put out 1.8v and it gives the motor more oomph I made the battery pack give 7.2v and it never sticks anymore.
This is a garage-door so its not critical access but is used a lot.
So long as it has a physical backup and can stay on my network I’m happy. I also need low power draw to stay bellow my 20w idle power budget but that’s a me problem.
If anyone has a vertically mounted stainless steel option with a keypad to recommend I’m all ears!
I’m curious about your power budget. Does that include appliances like water heater, fridge, etc? Or is it just for smart devices?
I’m really impressed by your efficiency. My router alone draws over half your budget. Add the cable modem and a 5GbE switch and that takes me 50% overbudget. And that’s just network infrastructure. With everything else in my apartment I’m probably somewhere around 800w, pessimistically.
That would be all 12v devices that run 24/7. So without the fridge compressor, water desalinator, 120v cooking appliances (when I have a surplus of solar and don’t use propane) and the hot water tank (although during the winter I heat water using a 4w pump and heat exchanger on my wood stove). I guess my work laptop isn’t included in there but I do my computing on a VPS since anything but a low power laptop puts a noticeable drain on my power reserves.
I run off 660w of solar so that’s why I’m so limited. Network runs off a portable open-wrt router plus a LTE hotspot (5G sucks at sea level in my experience) and most smart things are done on my Victron Cerbo GX.
During the summer I generate about 53kW/month and use about 74kW/month. The difference comes from a small generator and the times I run my diesel engine to get around and the 70A alternator charges the batteries.
So my average is ~100w all in.