Parelling old and new
Even after reading never add different age batteries I still had to try it. I bought 2 new of the same size and brand GC batteries. Added to my 1 year old batteries. I Equilized them and put them all 4 in service together. 10 days after S.G. was already needing eq .030 between cells. (I DID NOT EQ AGAIN) Not sure if it was due to adding new to older or from parelling. So I separated the batteries into 2 groups of 2-6 volts 1 system with 4 100 watt panels on pwm. This runs all inverter loads. System 2 is 2x190 gt panels on mppt. This runs all DC 12 volt RV loads. 10 days into running it this way S.G. is only .010 between all 4 batteries. Much better now.
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