[RE-wrenches] PS2512 with LFP

[Zeke Yewdall]

The default settings on the PS2512 don't look too bad for LFP -- 14.4
absorb and 13.4 float.  The 2 hour default absorb could be the issue, if
you didn't turn the generator off or unplug from shore power after it
reached absorb voltage.  And it would depend on the BMS for the battery
that you use... the rackmount EG4's that I've used don't really like more
than 14.1 or 14.2 for very long, even though you could custom set your own
BMS for 14.4 without problems with a 4 cell LFP.  Most rackmount
batteries are not rated for mobile use with vibration and such anyway
though... I think I've seen some of the cheap Li-time batteries that spec
14.6 volts, so might work with that -- though I've also found that a lot of
them give you the spec for the emergency shutoff voltage, not the
recommended absorb voltage.   Also, a lot of the cheaper BMS's can't handle
the capacity surge from turning on a large inverter like this, so would
need a precharge circuit too.    I think it's probably possible, but not a
definite yes to switch it to LFP.

Zeke

> On Wed, Apr 22, 2026 at 10:52?AM Chris Daum via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Hi folks:
>>
>>
>>
>> Some of these antiques just won?t die.  I have a fellow with a Trace
>> PS2512 in his RV (lightly used).  He?s very interested in lithium
batteries
>> ? there is no PV in this system; his battery charging is done by shore
>> power or generator.  Is there any sort of remote that will work with his
>> old beast, so he can accommodate the LFP technology?  Or is he doomed to
>> upgrade his inverter?   Any advice is very helpful.  Of course, the
manual
>> for the PS series doesn?t mention LFP technologies!




-- 
Zeke Yewdall
PV Engineer
NABCEP #031508-89
zeke at darkforestsolar.com
303-523-3592
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