Im following this thread as Im experiencing similar MPP 2424 issues. I have 6 240w 3s2p panels and expecting close to 1440w in full sun, Im getting on average about 250w off peak hours and at most 650w at full peak. Each 3 panel serial array puts out 104v open circuit using voltmeter. MPP display shows about 80v occasionally peaking at 88v. I'm concerned I may have misread manual as it says the " PV Array MPPT Voltage range" is 30~80vdc and Maximum PV Array Open Circuit Voltage is 145v. Even if it was clipping the volts, at maximum, 80v is about 90% of maximum (Pmax) I'm expecting from my panels (30.4 x 3 = 91.2v). So Volts seems fine, its the amps I think thats the problem. My panels short circuit current is 8.37a and Current at pmax is 7.89, so the two 3 panel arrays in parallel should put out 15.78a. Im further confused by the meaning of whats on the display in that it says PV "input" is 84v, but next screen it says Amps are 15a but instead of "input" it says "Batt", which appears to mean what the MPP is "outputting" 15a to the 2 SOK 206ah batteries (24v bank), so 26.4 x 15 = 396w. So if my shunt says 26.4v is coming in to battery (or SOC) then it shows amps as 15a then it makes sense that my batteries are getting about 400w from MPP, but again, why 1440w of solar results in 400 into battery. I'm also off grid, but when I run my generator which is attached to MPP, the MPP sends the maximum 40a to the batteries so the batteries are not full and are accepting 1000w from combined solar and AC from Gen. My mind keeps coming back to that "PV Array MPPT Voltage range".. is it not capable of accepting more? I also calculated my cable runs and it just does not make sense the kind of loss im experiencing. My next step is to test individual panels since they are new (but again 104v on voltmeter open circuit). The system is in the Sonoran desert and visibility on one of these days was approximately 90 miles. Some of the clearest solar environment in North America. And although my average load is about 170w, I turned on the whole house and microwave up to1700w and little if any effect on what the shunt read going into battery or Watts coming from Solar. What gives?