Looks like a lot of unknowns. Another head-spinning idea.....One method
to my wanting to use the FM80 might be to set a LBCO voltage too high
just to simulate a shutdown, have a fluke on the battery bus and another
on the aux output, load the battery to drop battery voltage. When to
aux activates read the battery voltage at the bus and the FM80 voltage
at the display Fluke using minimum-volt recording, if there is a
difference I would use that difference to set the aux LBCO.
Bill
Feather River Solar Electric
Bill Battagin, owner
4291 Nelson St. (Shipping)
5575 Genesee Rd. (USPS, UPS)
Taylorsville, CA 95983
530-284-7849, 258-1641(cell)
CA. C10 Lic # 874049
Solar Powered since 1982
Home of the Sunny Side Up
On 1/7/2025 6:28 AM, jay via RE-wrenches wrote:
Hi Mac,
yeah its confusing.
As far as I know, the fndc only controls the FNDC functions. its own
internal AUX, and AGS % which you can control through the inverter
relay or the FNDC relay.
All the other AUX relay functions are controlled by the device the AUX
is in.
But I could be mistaken
jay
On Jan 7, 2025, at 7:20 AM, Mac Lewis via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Hi Jay,
Adding some nuance here, and I could be mistaken about all
of the functions that get taken over by the FNDC voltage.
When you calibrate the FNDC, it "shows" the voltage on the Mate as
the FNDC voltage if there is an FNDC in the system. I also believe
that it defaults to the FNDC voltage for some logic operations like
AGS voltage starting etc. I am not certain that LBCO uses the
inverter voltage or the FNDC voltage, probably the inverter voltage.
I assume that all Mate operations default to FNDC voltage. I would
also assume that the aux relay will rely on the charge controller
voltmeter driving the relay.
One way to detect calibration issues is looking at the device status
pages on Optics. Each device will show a voltage and that will
correspond to the device. If something looks very different, it may
be worth calibrating. I have found most of the devices need
calibrating at some point, charge controllers, inverters and the fndc.
There are certainly voltmeters on each device, but I think some of
the logic is affected by uncalibrated FNDC and I have found it very
helpful to calibrate it carefully if I'm installing Lithium.
Certainly, your SOC calculation needs a calibrated FNDC.
On Tue, Jan 7, 2025 at 6:58 AM Jay via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Hi Mac
I’m
Going to disagree. The FNDC only provides its voltage it doesn’t
populate to the other devices.
You still have to set the inverter and CC separately, a poor design.
Depends on which mate you’ve got where the fndc voltage is located.
One reason I don’t like the CC voltage for aux control is that it
gets off while higher charging due to VD. And with lithium which
spend almost no time at lower absorb amps, it could effect the
actual end volts.
And for whatever reason I have definitely had CC accuracy wander
over time. IE the voltage calibration gets off for some reason.
Depending on the exact lithium, might not be a problem, some have
wider upper limit than others.
Jay
On Jan 7, 2025, at 3:47 AM, Mac Lewis via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Hi Bill,
Do you have a flexnet in the system?
I assume that it wouldn't matter if the FM80 is calibrated but
you will want the flexnet perfectly calibrated if you are using
Lithium. It's a very annoying but worthwhile process. Don't
drop the little nuts.
Here is a paper on the procedure:
https://www.outbackpower.com/downloads/documents/appnotes/fndc_field_cal_app_note.pdf
The flexnet acts as a master voltage device so the system will
default its voltage readings to the flexnet voltmeter. I'm not
sure if the aux function of the FM80 uses the FM80's voltage or
the flexnet voltage to drive the relay, but this could explain
the issue.
Good luck!
On Mon, Jan 6, 2025 at 10:51 PM Bill Battagin via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Hey Mac,
I've tried to calibrate the voltage displayed on
the Mate with the Fluke on the battery bus bars but it
doesn't seem to take after the adjustment in "calibrate".
But The Flexmax 80 does calibrate perfectly to the actual
battery voltage and its in the FM80 aux landing that I'm
using for this go-around to shut down the inverter to save
the batteries.
'Manually' meaning.....?
Thanks,
Bill
Feather River Solar Electric
Bill Battagin, owner
4291 Nelson St. (Shipping)
5575 Genesee Rd. (USPS, UPS)
Taylorsville, CA 95983
530-284-7849, 258-1641(cell)
CA. C10 Lic # 874049
Solar Powered since 1982
Home of the Sunny Side Up
On 1/2/2025 5:53 PM, Mac Lewis via RE-wrenches wrote:
Hi Bill,
Are all your voltages calibrated? Mate, Flexmax, FM80?
Where are you reading the voltages?
Does it work OK manually?
On Thu, Jan 2, 2025 at 12:08 PM Jay via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Simpliphy has a very high voltage LVD.
And the older OB can’t be programmed to those voltages
On Jan 2, 2025, at 10:04 AM, Tyrone Houck via
RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
Forgive my ignorance but why won't the vfx lbco work
for lithium?
On Thu, Jan 2, 2025, 8:19 AM Bill Battagin via
RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
I am trying to use the "low battery disconnect" in
aux mode in a newly
installed OB FM80 CC for Li battery low voltage
protection. I can't use
the 19 year old OB VFX inverters for obvious
reasons. The plan is to run
the 12 volt output from the aux output to a NC
relay to open it at 50
VDC of the bank of SimpliPhi 3.8M batteries. 50
VDC is SimpliPhi's
recommendation for LVD. The "output" of the relay
would be connected to
the VFX's ON-OFF landings of that little green
terminal block in the AC
side of the inverter and just act as a simple
switch for the inverter to
turn it off to save the batteries.
I'm using one of my newer FM80's as a
test run and have
programmed the voltages in Low Battery Disconnect
mode and then put it
in auto mode. However, as the CC goes below the
voltage set point, the
AUX output does not turn on (time set for 5
seconds), as evidence in the
CC's home screen and by checking for 12V at the
AUX terminal block.
Any ideas of what I'm missing here to
make this work? I
know the other solution, thousands of $$ for new
inverters which would
be great but these folks have already invested
quite a chuck on array
replacement and charge controllers.
Thanks for any experience with this.
Bill
Feather River Solar Electric
Bill Battagin, owner
4291 Nelson St. (Shipping)
5575 Genesee Rd
<https://www.google.com/maps/search/5575+Genesee+Rd?entry=gmail&source=g>.
(USPS, UPS)
Taylorsville, CA 95983
530-284-7849, 258-1641(cell)
CA. C10 Lic # 874049
Solar Powered since 1982
Home of the Sunny Side Up
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