[RE-wrenches] OB Radian / FM60 grid tie mystery

[Foxfire Energy]

I had a similar problem a while back and it turned out to be the FNDC calling the shots.. Unplug the FNDC (if you’re using one).. see what happens.
db

Sent from my iPhone

On Aug 18, 2024, at 1:12 PM, Kirk Herander via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:


Hello All,
.
I have a Radian 8048 system in service for over 10 years now. It sold back quite normally until the last several months -3.- FM60 CC's are set to grid tie mode and  viewable and programmed from the Mate3s / OpticsRE. This issue loosely correlates to replacing one of the CCs several months ago.

Trouble is all -3- charge controllers are almost always in a float mode. The radian does sell, but at a small KW compared to what it used to before the frequent float mode started popping up. If I remember correctly, ideally the CCs should always be in bulk charge when sellback occurs.

I have the CC and inverter charger float set to about 1 vdc higher then the inverter's sell volts, as I believe was recommended way back when. Hard to understand what changed, but something did. I've checked the relevant setpoints many times and can't find anything obviously amiss.

Does a sell mode tech note paper exist still for the Radian system? Did it ever? Any ideas would be greatly appreciated.




--
Kirk Herander / kirkh at vermont.solar<mailto:kirkh at vermont.solar>
Owner|Principal, VT Solar, LLC
Celebrating our 33st Anniversary 1991-2024!!
dba Vermont Solar Engineering
802.559.1225
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