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

[Kirk Herander]

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 <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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