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

[Nick Lucchese]

You're observing this on all three controllers or is the reduced sell back
off by a factor that would correlate to the newest controller you swapped?

Did you calibrate the new controller while the PV breakers were all off? I
still come across new FM80's that require utilizing the entire .5vdc margin
to match my Fluke.

Though it's not a solution can you temporarily raise the bulk setpoints of
all three to verify expected outputs?

It does seem like there was a document on proper sell back settings
somewhere.

Good luck, Nick


On Sun, Aug 18, 2024 at 10:11 AM 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 <kirkh at vermont.solar>*
>
> *Owner|Principal, VT Solar, LLC*
>
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>
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>
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