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Shurflo pumps should work What application? The Shruflo pumps performed best in applications where the pressure flow switch can work https://forum.solar-electric.com/discussion/18533/using-panels-directly-to-12v-shurflo-pump

I don't have info on your batteries, I just switched to Li from AGM and discovering the pain of BMS and all that! You may want to post the battery issue as a separate inquiry and someone may be able to help. What I noticed so far on batteries is that Pylontech is the most popular BMS...

The key thing is the total voltage of the string. Can you check what voltage range usually appears on your display at max sun? The SPF can take up to 450V as max input Let's break it down this way Each of your 400W panel has a Max Power Voltage, multiply that by the number of panels should...

Thanks for this. Got my dongle working. I had to do several restarts

When you are on USE setting and using Lithium batteries, you are leaving some capacity unused. I had BMS issues between the Growatt SPF5000ES and BSL 5.1KWh batteries (which is sorted now). When I switched from USE to Li setting, the batteries will go from 100% to something between 77 and 80% at...

Have you sorted this? It could be your string voltage exceeding 450V and the MPPT shutting down. Rewire your series string so that you do not exceed 450V max power volts, the ratings are usually on the nameplate of the panel.