I am trying to get my head around batteries.... we have two 110a/h on Percy and Waterlily has three x x110a/h, both plus starters.
Now I know with three you will get longer power supply, simple really, but you would then have to charge up three batteries instead of two. So whilst my smartgauge will drop to say 90% on Waterlily after an evening aboard maybe Percy's Smartgauge will drop to 80%. it used to take an hour to put 10% back into Waterlily's battery bank so it will be interesting to see what it takes to put the same 10% back into the two on Percy.
Now as I understand it batteries die based on their discharge/recharge cycles. So is it the case that taking a battery to 80% then recharging is worse that 90 % and recharging? If it is marginal then surely it is better to have less batteries as they will be cheaper to replace when the time comes.
Also I suppose there is less risk with fewer batteries of one dropping a cell and causing the others to work so much harder without the owner knowing?
I have been following a post on Canal World about smartgauges... normal pin balling around with a few insults in there but in the main an interesting thread. I think the Smartgauge is a little smoke and mirrors device, simple at what it does but reliable and users like me get drawn to its % comfort. There are other ways, many will just use instinct/experience to know how much to run the engine, others use multimeter's to alert them to 12.2 volts (is that the magic figure for the time a battery bank needs recharging?) Anyhow I like the reassurance, having been without power is not a good experience and the thought of destroying a battery bank because you are not aware of its low voltage state or a dead cell within the bank is not comforting.
I'd be very interested in what you use to monitor your power?