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My off grid solar system dates from my 2007, I have been its sole operator. The system consists of an xantrex sw-4024, 4x crown cr-395 in series for 24v nominal. The current panel and charger configuration is 6x 305w panels, a midnight classic with a wizbang and endamp charging enabled. I've added a diversion load last year and I've noticed a funny phenomeneon. When the diversion load is active the battery voltage drops from 28.8 to 27.6 even though the net amps are still in the positive ( around 6-7 amps).I should add that when I check the SG of the batteries all cells are getting a good charge (SG 1.275-1.285). Is there a technical explination for whats going on here? My suspicion is that it has something to do with the age of the batteries although I'd love to hear a more detailed explanation.