My solar system has been working fine for almost a year, then suddenly when repeated power outages occurred for 30 days in a row every morning from 1;30am to 6;30am my batteries started running flat.I have two sets of 4 x 200a/h batteries in parallel. Drawing about 500watts from the inverter during this period .Eventually I sat there and watched the charging cycle as it happened and noticed time and again the bulk charge cycle jumps straight to float cycle,as soon as it reaches 56,4v setpoint. Then it just idles there until the next power outage.It does not go into saturation. I tried everything,changed setting no.2 from 50 to 30 to 40 to 60 and it made no difference.Eventually I found setting no.32 was set on aut, so I changed it to 360 minutes and presto,my batteries are charging and the system is saturating.
My question is what is the best time advised to set this saturation time(32) on.?