E05 = low voltage. Check connections for tightness..
http://www.xantrex.com/documents/Inverter-Chargers/Freedom-HF/Freedom%20HF%201000-1800%20Owner's%20Guide%20(975-0390-01-01_Rev-A)-1.pdf
Also consider purchasing a Flow-rite Quik-fill kit for water levels. Much easier to maintain proper levels. Flow-Rite MP2000 Qwik-Fill 2 Battery...=yo_pop_ma_swf
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