I'm working on setting up a DC UPS for my home network closet (router, NAS, cameras, etc). Ideally for simplicity, I would have these connected in parallel:

1. CV/CC power supply set to 3.3V/cell or ~70% SOC
2. 8s LiFePO4 battery, 25.6V nominal
3. Load (buck and boost converters to 5V, 12V, 48V)

The batteries I have in-hand are these: https://k2batterystore.com/collections/catalog/products/24v-11ah-lithium-iron-phosphate-battery

What I'm mainly concerned about is whether or not the batteries will properly maintain balance in this setup without a smart charger cycling them up to 100% SOC every so often. Does anyone have references or reading material on this subject?

Hey all,

I've got a set of three 60-cell panels and microinverters that I want to mount on an asphalt shingle roof. I'm planning to expand the array to 16 panels in time.

Does anyone have recommendations for low-cost mounting systems and online retailers that sell them? I like the idea of rails, but from what I've seen shipping costs are prohibitive and I'm trying to do this on a budget, so rail-less options are appealing also.

Hey all,

This is only tangentially related to HA, but it seems like this crowd might have answers. HA integration would be nice but is not required

We moved into a new house about 3 years ago and have been plagued by nuisance alarms ever since. They happen most often in the middle of the night, but aren't uncommon in the daytime.

I have:

• Replaced all the old hardwired detectors with new battery-only ones thinking it might be caused by EMI.
• Ruled out insects crawling into the detectors.
• Sealed the electrical boxes thinking it might be dust from the attic.
• Installed an excellent filter system in the HVAC.
• Cleaned out all of the detectors with canned air.

Other random info:

• Only the ones on the second floor go off. There are five upstairs and two downstairs.
• I'm pretty sure one (and only one) of the false alarms was caused by humidity from a shower.
• Seems like they're happening less often since I installed a new HVAC system, but that could be due to less dust or due to smaller temperature swings (less of a setback at night).

I think at this point I want to get some fancy multi-criteria alarms, ones that are specifically for reducing your nuisance alarm rate. Also for increased capability, though - one of my coworkers just narrowly escaped a housefire with his wife and dog. Their fire alarms failed to go off and he was only woken by the sound of the flames.

Any suggestions for multi-criteria alarms that work with hardwired 120VAC, preferably with hardwired interconnection?

Hey all,

We moved into a new house about 3 years ago and have been plagued by nuisance alarms ever since. They happen most often in the middle of the night, but aren't uncommon in the daytime.

I have:

• Replaced all the old hardwired detectors with new battery-only ones thinking it might be caused by EMI.
• Ruled out insects crawling into the detectors.
• Sealed the electrical boxes thinking it might be dust from the attic.
• Installed an excellent filter system in the HVAC.

Other random info:

• Only the ones on the second floor go off. There are five upstairs and two downstairs.
• I'm pretty sure one (and only one) of the false alarms was caused by humidity from a shower.
• Seems like they're happening less often since I installed a new HVAC system, but that could be due to less dust or due to smaller temperature swings (less of a setback at night).

I think at this point I want to get some fancy multi-criteria alarms, ones that are specifically for reducing your nuisance alarm rate. Also for increased capability, though - one of my coworkers just narrowly escaped a housefire with his wife and dog. Their fire alarms failed to go off and he was only woken by the sound of the flames.

Any suggestions for multi-criteria alarms that work with hardwired 120VAC three-pin connections?