Solar controllers

Hi, My 12 volt lithium battery system shut down @12.3 volts-not a problem , but now batteries are only charging to 13.5 volts .The controller input is 15.98 volts but output is only 13.5 volts where previously my batteries charged up to 14.7 volts . both controllers are giving the same result. Why? Thanks John I just remembered I had this problem sometime ago and it suddenly corrected itself .Hope it does again.
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is this in really hot weather ??
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
-Bill