I have a 2 stage 20A battery charger.When on long cruises, I have never discharged below 100ah and the 150a alts recover this without problem. I noticed the battery capacity problems this winter,(using the boat as an occasional caravan in the marina) With 50ah discharge and a 10A load,(a typical load is nearer 5A) I was showing 11.9v and the heater was failing with low battery code. The charger cuts out after perhaps a couple of hours, we show 13.2v If I leave the boat and return with a little weak sun, I often see about 13.8 on the monitor but this quickly drops off on discharge. The S.G just reach 1220. A few months ago a attached a Halford's car charger for 60 hours, kicking out 1A or so. and managed to lift th S.G to 1250 but this was not a cure. We are about to embark on a 5 month cruise of Ireland where we will spend most of it on anchor. Tryinf to rejuvinate my vartas with some heavey charging might not give me the peace of mind that new batteries would. Culd it be that the marina use of the batteries is not being recharged by my battery charger although I am not deep discharging but recharging at about 50ah discharge ? And that the cruising system I emplay is probably ok?
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