Don't forget that it's the monsoon season in the north. Jan and Feb are the wettest months, and even if it doesn't rain there could be a fair bit of cloud around.
The closest BOM weather station to Kidston is Carpentaria Downs station - about 25 Kms north east of Kidston. Here's a link to
daily global solar exposure measurements at Carpentaria Downs - there are certainly days where solar exposure is lowered by cloud cover and thus solar power generated would be well below rated output.
