[RE-wrenches] Outback EQ not holding voltage

[Dave Tedeyan]

Brian,
I had tried lowering the EQ voltage by 0.4V. The batteries still get up to
the EQ voltage, but then fluctuate right at or 0.1V below.

Dave,
The EQ countdown timer does not count down when the battery voltage is
below the EQ setpoint (even if by 0.1V). And since the timer never gets to
0, the system just stays in EQ.

Also, we have found that the issue is somewhat intermittent. At one point
Outback had me reset the CC and FNDC back to factory settings and reprogram
them. It seemed that it helped, but then a month or two later it showed the
same issue. So this does not happen with every EQ cycle, it just happens
for most of them.

I also received another suggestion that the battery bank has a couple bad
cells which will lead to higher temps and so with the temperature
compensation the bank is just not getting to a high enough voltage.

Cheers,
Dave

*Dave Tedeyan, PE*
Senior Engineer | Taitem Engineering, PC

110 South Albany Street | Ithaca, NY 14850
o. *607.277.1118 x121*  f. 607.277.2119
www.taitem.com

Solar • Sustainability • Energy • Design
Certified B-Corporation since 2013


On Tue, Apr 28, 2020 at 11:08 AM Dave Angelini Offgrid Solar <
offgridsolar at sti.net> wrote:

> Does not sound right to me. Usually both Outback and Schneider protect
> against uncontrolled EQ time and end EQ.
>
> I think I would remove the network after the battery is full and test one
> controller at a time. Might have been damaged by lightning or gen
> glitching. Since you say it does this from the inverter charger on genset
> (only no fm80's) is even weirder. Eliminate the network.
>
> *Dave Angelini Offgrid Solar
> "we go where powerlines don't"
> http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/>
> e-mail  offgridsolar at sti.net <offgridsolar at sti.net>
> text 209 813 0060*
>
> On Tue, 28 Apr 2020 07:00:21 -0700, Brian Mehalic <brian at solarenergy.org>
> wrote:
>
> Sorry you had already answered the first two questions :) What about the
> others?
>
> Brian
>
> On Apr 28, 2020, at 6:50 AM, Dave Tedeyan <dtedeyan at taitem.com> wrote:
>
> Hi All,
>
> I've got an outback system (Radian 8048A, 2 FM80, 16 Trojan L16RE-B) where
> when the customer equalizes, the batteries hover right around the EQ
> voltage, but will often dip to 0.1v less. Because of this, the EQ timer
> does not count down properly, and so left to its own devices the system
> would equalize for way longer than it should, potentially forever. This
> will happen when doing an EQ from the solar on a bright sunny day, or the
> generator, or both. The customer can manually keep track of the time and
> manually stop the EQ after 3 hours, but that is not ideal. Has anyone dealt
> with this before and have any suggestions on how they fixed it?
>
> This system is 3-4 years old, and the issue only started in the past year
> or so.
>
> Cheers,
> Dave
>
> *Dave Tedeyan, PE*
> Senior Engineer | Taitem Engineering, PC
>
> 110 South Albany Street | Ithaca, NY 14850
> o. 607.277.1118 x121  f. 607.277.2119
> www.taitem.com
>
> Solar • Sustainability • Energy • Design
> Certified B-Corporation since 2013
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