[RE-wrenches] Flickering lights on off grid AC coupled radian system

[Chris Sparadeo]

Hi Lars,

It sounds like an issue with frequency shifting. I’m guessing that this is
mostly happening when the battery is full. The Radian is shifting its
frequency (to probably around 63-64 Hz)  to turn of the AC coupled PV
inverter. Some lights and electronics don’t like this and can either
flicker, or turn off. This is one of the issues with AC coupling that makes
it a less than ideal fit for off-grid application.

One option would be to look into replacing the lights with something that
has a larger tolerante for change in frequency. Another option might be to
lower the inverter’s grid frequency tolerance so that it trips and turns
off before the flights end up freaking out.

Hope this helps.

-Chris

On Wed, Feb 2, 2022 at 2:59 PM Lars Ortegren <lars at cal-solar.com> wrote:

> Wrenches,
> I'm hoping to solve an issue we've had with a couple of our off grid AC
> coupled systems. We have had multiple reports of different LED and
> traditional ballasted fluorescent systems "flickering" during the day when
> the AC systems are producing power. We havent had issues with other off
> grid AC coupling using Sunny Islands, or even old VFX inverters, but this
> does seem to be an issue directly related to the Radians.I'm wondering if
> any of you have had experience with this, and if you found any hacks to
> "clean up" the power?
>
> --
> Lars Örtegren
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