If you have been taking the readings from your link which is presumably sensing the 12 volt system then your system has never worked properly. I thought you said you have 2 x 230 watt panels but even 410 watts on a good day should produce about 20 - 25 Amps taking electrical
losses into consideration. Do you have any shadowing at all, even a back stay shadow can drop your output considerably (like 25% - 35%) in some cases. Other than that check the wiring
. What brand module are you using, there were a bunch of Chinese modules that made it onto the market which where labeled and sold as producing a lot more power then they really produced. You might want to have someone familiar with solar
take a look at you install.