Louis513

With maximum load it will only draw a max of 2KW from PV instead af 4KW

Hi I have a Growatt SPF 5000 TL inverter that stopped using the full capacity from the solar panels. I have approx 4000w potentially available from the panels. It supplies the inverter at about 130V. However at peak times in clear conditions it will now only draw just under half of its usual capacity from the panels when there is a substantial load on it. For with example, a load of 1Kw I would usually draw about 2.5Kw from the panels. 1 for the load and about 1.5 for charging the batteries. Now it will only draw about 1.1Kw from the panels. I have tested each set of panels individually and they are all producing the correct voltage for the inverter (130V). Any ideas on what could be the problem?

Hi I finally managed to get my logging working due to the post indicating the need for separate firmware updates. (For the comms and the main inverter software) My problem originally began with the “Total Solar Energy” on the monitoring software that just one day switched to negative value and started increasing again. I got in touch with Growatt and was also corresponding with an “Amos” who instructed me to update the firmware. I had delayed this but eventually I started getting intermittent issues with the logging as well. It would randomly stop working but always stopped when the batteries were full and then returned to normal when the batteries were down to about 85%. I then decided to update the firmware I got from "Amos" (F2809_GW500.10_20210106_C.bin) but then I started experiencing the same as what others described, where it would only work when the battery type was set to “USE” instead of “Li” which is not a solution. It was then that I saw the post that the comms board also required a firmware upgrade. I downloaded it from the link in the thread (STM32F030CC_SK036.01m.bin). After I updated this my logging started working perfectly again. The original problem of the negative amount of total energy generated persists. It now remains constant at -4kWh. I did not reset the dongle or create new accounts. I did also notice that setting the logging rate on the dongle to 1 min (via the mobile app) does now seem to work and it appears to be logging every minute as expected.