Re: battery change questions

On Fri, 2 Aug 2024 23:13:42 -0400,
  bfh <redydog@rye.net> wrote:

 Ted Heise wrote:

On Fri, 2 Aug 2024 14:07:23 -0400,
   bfh <redydog@rye.net> wrote:

  Back in a previous life, we did a lot of flatspotting and got
  along fine without a generator, but we didn't have a microwave,
  electric coffee pot, or a toaster.

 
The wife and I are spoiled, what can I say.    :)
 
But how did you charge the trailer battery?

 
 It charged through the 7-pin when driving, and with the
 built-in charger when we had shore power. I don't remember
 having any battery problems when flatspotting, but we rarely
 stayed in one place longer than 2 days/nights. Plus, we weren't
 spoiled back then, and all we used when parked were 1 - maybe 2
 - lights and the water pump.

Okay, charging from the 7-pin is what I'd expect, but I haven't
seen any evidence of that happening since I put in the new LiFEPO4
battery.  Admittedly, it's just been one trip of ~5 days.

I do wonder if the battery has to reach some lower SOC than I've
seen (85%?) for charging from the 7-pin to kick in.  Operation of
the Dometic battery monitor is still largely a mystery to me...

https://www.amazon.com/Go-Power-GP-BMK-25-Battery-Monitor/dp/B09NRXD9G8

Is it possible the 7-pin will actually charge the battery if it
gets to a lower SOC?  If yes, do the GP-BMK-25 settings make a
difference in this level?  I can't tell from the "manual" and mre
broadly havn't been able to get a good unserstanding of how it
works.

Maybe another relevant point is that the new battery shows its
state in good detail via a nifty bluetooth linked app; the info
from the battery makes sense, but diverges at times from what the
Dometic monitor shows (especially as it relates to SOC). 

--
Ted Heise      <theise@panix.com>       West Lafayette, IN, USA