Given that my symptoms started with extended duration of <0°F temperatures, I am not sure that LFP is the solution. Not keen on being a pioneer, so waiting for more anecdotal results north of the Mason-Dixon line.
Taking hours to recharge is not quite right. You'll see lead acid batteries recharge to about 98% in 15 minutes. That's what I see out here in the depths of a Wyoming winter. The problem you can run into is a series of 10 minute runs where the battery gets up to, say, 90%, then 90% of 90%, then 90% of 90% of 90%, etc. You get the idea. In my observation a fully warmed up engine and transmission, maybe 30-40 minutes will get you to 100%. Of course you then have to factor in Ford's programming of 80% as its full charge point. After replacing my OEM battery with a NAPA catalog one for a 2021 F-150, I've had zero problems without any programming changes.
An AGM wired as a direct replacement of the OEM battery could help you too.....it just won't have as high of a resting voltage, but you will have more reserve capacity than stock.
To properly connect a high wattage stereo to the PB, you want to tap the same post in the BCMC that the battery isolator connects to. Don't go straight to the battery. For the ground I went with dual 8ga grounds, one connects into the cab's back wall where the aux batt connects, the other runs through a hole drilled into the cab floor on the passenger side down to where the PPOB inverter grounds to the frame.
Seemed to good to be true, so I went out this morning and checked again. 12.43V, which seems to be right at the 80% SOC that Ford aims for. May be something I check periodically.
I believe, if you check, 12.43 VDC was not a true resting voltage. Unless you triggered the hood to unlatch earlier and didn't have your key fob in your pocket, you were seeing lightly loaded voltage. Some truck modules had alerted as you approached the truck. The nominal resting voltage at 80% SOC is around 12.8VDC. That someone above saw 13.2VDC I find amazing as that is around the true 100% SOC at no load of any kind. The times I followed my battery's voltage (having unlatched the hood and leaving the fob far away) I saw 12.7 to 12.8 VDC. When I allowed the truck to alert I saw around 12.6VDC and that would slowly decline.
I was gonna say! ?
Since nobody else is jumping on, I see a lot of references to OBDLink (MX+ or LX). @Snakebitten should get a commission, since his posts compelled me to drop $$$ on the MX+ a few minutes ago.
