Is it normal if the solar radiation data captured during midnight 00:00 (124 w/m^2)?
That's going to depend on your location.
Does it get completely dark at your location of measurement?
Kipp & Zonen have a guide on the instruction sheet for the CNR4
(https://www.kippzonen.com/Product/85/CNR4-Net-Radiometer)
where that value seems to correspond with a fully clouded day.
Might be a little high if you're near the equator.
That would be infrared can be that high with clouds. Shortwave will be 0 on a completely dark night.
The spike is every day at 00:00 midnight only. Zero reading started at 7 pm to 6 am (Malaysia time)
Does your system switch power on to something around midnight?
It could be that another device connected is using enough current to create an offset voltage on analog ground. Anything using significant power should use G terminals for ground.
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