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From: Ted Heise <theise@panix.com>
Newsgroups: rec.outdoors.rv-travel
Subject: Re: battery change questions
Date: Sat, 3 Aug 2024 12:37:11 -0000 (UTC)
Organization: My own, such as it is
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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