just been checking the PH of my bank of 8 surrette 460s and heard what sounded like someone breathing. being as there is only me and the cat here i was somewhat puzzled till i realised it was the battery bank gently sighing. a full bank and and a hot sunny day. solar is putting a nice gentle 5 amps into the bank, charge controller is saying full bank, hydrometer is in the green. now if i could say that in the middle of december i will be really happy.