[RE-wrenches] AGS quiet time

[Zeke Yewdall]

Just to clarify on the issue of open vs closed loop, when I talk about open
loop lithium battery operation with older equipment, I am not meaning to do
voltage based AGS control.  I would still do SOC based control for this --
with an SOC meter that the AGS can read, like an FNDC, Magnum BMK, Victron
smartshunt, or whatever the Schneider one is currently called.  Trying to
do voltage based control on lithium batteries I find to be very difficult,
as many people have mentioned.

Yes, SOC drift of your AH counting SOC meter is an issue here... which is
why having a voltage catch like you could do with outback was nice -- start
the generator at 30% SOC, but also catch it at 50 volts if the SOC reading
go out of wack with reality.

On the issue of SOC for EV's... I am not sure that they do a better job, so
much as they pretend to.  Car makers learned long ago to dumb down even the
actual gauges on cars, so people would not ask questions.  Ford oil
pressure gauges for one example...starting in the late 70's, it was a guage
on the dash, but driven by a pressure switch, so it always stayed the same,
so people wouldn't ask why it was going up and down with temperature and
rpm... Sometimes the less you know, the happier you are.  I just installed
individual detailed string monitoring on 6 indentical strings of PV, and
they vary by several percent at times during the day, and you can also see
two different MPPTs from different manufacturers behaving differently at
times.


-- 
Zeke Yewdall
PV Engineer
NABCEP #031508-89
zeke at darkforestsolar.com
303-523-3592
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20260413/e32e2ac9/attachment.htm>