comments:
It sounds like you found the issue. Solar panel output isn't as proportional to apparent illumination as it feels like it should be. Any amount of even partial shading significantly reduces the output, and there's a minimum threshold before charging can actually start. The 2000+ only has a single channel charge controller, with the two solar input ports wired to the controller in parallel, but the specs of the SolarSaga 200 would support using two of them in series, with the series connector. You can connect two to one port, now, and two to the other port, later. The connector actually has 3 ports but you can't use 3 of the 200 panels with a 2000+ by my reading of the specs. See https://www.amazon.com/dp/B09VC6GR5V With two panels in series, you can squeeze a little more power out compared to two panels in parallel because you'll have a little less power loss in cables and connectors, which might help you out a little bit... but that's also a double-edge sword, because output is reduced to essentially 2x the max output of whichever panel is capable of the least power at any given instant when panels are connected in series. If you have so much shade that it's hard to keep the panels both illuminated, disregard that suggestion, but otherwise consider it. Because of the fact that the 2000+ only has a single channel charge controller, whatever you plug into each port needs to match the other port, particularly in Voc and Vmp, so your options for mixing different types of panels as you try to increase capacity are limited. But the input solar ports on the external battery packs operate independently from the main chassis, so you have some flexibility there if you have one or more of those.