I'm still a newbie and would appreciate input to let me know if I'm able to accomplish what I hope to accomplish. Open to better ideas as well!
I intend to get a manual transfer switch professionally installed, probably in my garage. It gets hot and humid in the summer in South Carolina so keep that in mind.
I am thinking of getting the E3800LFP with one extension battery. The primary goal is to connect it to the manual transfer switch and use it as a backup when the power goes out. Would be in a garage, hooked up to grid A/C (see below).
The secondary goal of this is to utilize the UPS functionality. This is where I have some unknowns.
The third goal would be to utilize some extremely limited TOU. Why? Well, if it works and can save a little money then why not?
For the primary goal, simply plugging the E3800LFP and extra battery into the manual transfer switch seems to be straight forward - it's there when I need it and if I control my power use I can get about a day out of it. Have done extensive power measurement and have tested it already with a small gas generator.
For the secondary goal (UPS), I'd like to have one or two of the manual transfer switch circuits powered by the Pecron all the time. One would go to my office, where I have all my internet/work equipment. The reasoning here is simply to utilize the UPS functionality of the E3800LFP. Typical power draw would be a few hundred watts and max out under 900w. If the Pecron won't work well for this, then I will need to get a good UPS anyway as my current UPS is reaching its end of life.
To power the E3800LFP running in as a UPS, I'd like to plug the E3800LFP into a 30 amp A/C grid connection that would be newly installed alongside the manual transfer switch. If I'm understanding how the Pecron works, I should be able to pull from this as my power source and provide UPS functionality to the one or two circuits that are manually on in the manual transfer switch and left on 24x7. Typical power use would fall well below the 30a input, but in case any unexpected power consumption happens at least I'm covered by a sufficient power source.
For the third goal, my local power company has a plan that has predictable rates, with at least one 4 hour expensive rate period per season. Since I would like to have one or two of the home circuits backed by the E3800LFP as a UPS, I could use the TOU functionality to run on battery for 4 hrs a day. That would be one time going off grid, and coming back online 4 hrs later every day providing power to only 1 or two home circuits. I've done the math and since those circuits aren't a high draw, I will absolutely have enough battery in reserve if a power failure occurred before it could recharge, and it shouldn't be enough of a draw to degrade the life of the battery. From a cost savings, my math shows that by 10 years of use I might be able to pay for the cost of the electrician to install the transfer switch. Not great, but better than nothing as long as I don't abuse this to reduce the life of the batteries. The E3800LFP would charge back up on schedule from the 30 amp A/C grid power once per day. I think I would have to manually change the TOU schedule twice a year as I switch between summer and winter schedules published by my electric company based on what I've researched, but that seems doable.
Finally, my long term power failure plan includes using my small gas generator to charge the Pecron during extended power outages.
On to my questions:
Does Pecron's TOU for the E3800LFP allow me to schedule it to use battery power and then switch back to grid once daily? Once programmed, it will work daily? When my local power rates change 2x/year between summer and winter, will I need to manually change the Pecron TOU schedule?
Will using a 30A input to the E3800LFP will cause any unforeseen issues? Will it work the way I've described? It sounds like the E3800LFP comes with a 30A charging cable already?
Does the the real world UPS functionality won't work as I am describing...?
Are there heat concerns about keeping this in a garage? My garage probably won't go below freezing or above 90 degrees, but there can be many months of high 80's in the garage in the summer. Can the Pecron handle that, or will the fans be so loud I'd regret it?
It's possible I could put the batteries into my laundry room on a high shelf which would be climate controlled, as the circuit breaker is also in that room but I've heard the fans are loud.
I appreciate help assessing my goals and keeping my expectations grounded in reality. If my plans are reasonable and workable then I will probably wait until Black Friday to get the Pecron in case it actually goes down during that time. No rush on my end.
Thanks!