[RE-wrenches] Grid-Tied Radian Force Discharge

Tue Apr 23 14:22:14 PDT 2024

Yes, Grid Zero would work, but the customer wouldn't be selling power to
the utility.   You could program the Radan to sell more power by lowering
the sell voltage. I would get aggressive with it for at least 20-30 cycles
to see if you can recover some capacity. Ideally, to recover lost capacity
from lead batteries, you want to do 50-80% cycling for at least 5-10
cycles.

I would be cautious about HBX mode, its issue, and why this mode should
have died with the old Trace Eng inverters... HBX mode tends to kill
battery banks if left there too long or you are not getting the battery to
100%. The problem with HBX mode is that there is no way to control absorb
timers, so the batteries get to the 80-85% range but never get to full; if
the batteries are lead, this is going to create sulfation problems, and if
AGM will end up in severe swelling.    If I remember correctly, you can
adjust the delay timer for HBX, which should be equal to the programmed
Absrob timers, but I don't know if they killed this in the new firmware.

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On Tue, Apr 23, 2024 at 1:53 PM Maverick Brown via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> You can do it in one of several easy ways.
>
> HPX mode on the Mate. High Battery transfer. When the battery voltage
> and/or SOC is above the setpoint drop the grid. When the battery voltage or
> state of charge goes below the setpoint pick up the grid. This case the
> Mate  is doing the driving.
>
> Also available is Grid Zero mode where the inserter decides to zero the
> loads based on battery voltage and AC amp load. Then you would set the
> ReBulk set point on the inverter charger to trigger charging the batteries
> instead of zero AC loads.
>
> The third choice is to program something called FlexTime where you set the
> schedule of the AC input mode from grid tide to red zero or off grid, etc.
>
> It’s the system is on OpticsRE, you can adjust the settings fine-tune to
> get the best performance out of those Northstar batteries.
>
> I just decommissioned a 36 battery group of Northstar batteries after 13
> years and most of them are still viable.
>
> As a precaution, For AC coupling, I also install a high battery AUX port
> controlled relay that drops the AC coupling input circuit.
>
> Thank you,
>
> Maverick
>
> Maverick Brown
> Off-Grid Solar Commander since 2006
> Maverick Solar Enterprises, Inc.
>  • Solar Commander Remote Power
>  • SunFlow Systems Cathodic Protection
> maverick at mavericksolar.com
> 512-460-9825
>
>
>
> On Apr 23, 2024, at 3:36 PM, Dave Tedeyan via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> 
> Hi All,
>
> I have an AC coupled Radian that is used to back up certain loads when the
> grid is down. It is paired with the Northstar Blue (Outback) batteries. The
> system sits in float nearly all the time. During a recent grid outage, the
> batteries had less than half the capacity that I would have expected, and
> they are only about 3.5 years old with very few cycles on them.
>
> I tried to talk to Outback about it, which seems to not be possible
> anymore. I did talk to Northstar, and they recommend not leaving the
> batteries in float all the time.
>
> I am wondering if anyone knows of a way to force the Radian to
> automatically discharge the batteries to a certain voltage ideally once a
> week, but could do daily. Essentially, I would like to utilize a time of
> use schedule where I can force the radian to not use the grid and just use
> the battery to power the loads for a little while. Ideally this would be
> automatic, and not require the customer to go through the grid breaker
> every once in a while. It seems that from the manual, I need to keep the
> Radian in Grid Tie mode in order for it to be able to sell excess PV back
> to the grid. Any ideas?
>
> Thanks!
> -Dave
>
> --
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