Hello,
Our lineup is 2 pcs Smartsolar 100/20 Mppt Trackers. 4pcs Astronergy 285W solarpanels (connected 2pcs series for each tracker). Multiplus 24/3000. 2pcs Ultracell 12V 200Ah (connected in 24V). Venus GX.
Mppt are connected in parallel. And each panel set is installed in different directions. Because target is floating sauna and direction isn't stable ;)
Last autumn everything works fine until dark winter season comes in Finland. And now when we have sun mppt's are doing something weird. They dont charge at all even vrm solar voltage is high on each tracker. (50-65V). Only some watts blinking sometimes and it seems current is going negative sometimes.
Firmwares are updated.
It is possible that it is firmware problem or what it is?
Mppts are connected to the venus with ve.direct cables. And i even tried to fix problem by disconnecting other mppt from the system and making them work independently. Problem stays.
Our other solar destinations does not have any problems. And we have enough sun to charge.
There is some screenshots from VRM.
Thank you for your help.