Hi,This will would be the easiest to measure your banks voltages, using some simple maths to get the top bank's voltage level.It will identify which bank is lower, but not if it is only one battery in the bank.Sealed batteries unfortunately do not make individual battery condition easy to establish.Wet cells of course, all you need is a hydrometer.You need to find the suspect batteries not try and discharge or charge a complete bank.If you have a DC clamp meter you can check your link currents, with the banks completely unloaded and with no charging.Checking the current in each link will tell you where your suspect batteries maybe, the current will be flowing into them and dragging the good ones down.However if you have a battery with high series resistance, then an individual load test is probably another alternative.Tom.....
thanks for all the concerns.. Im happy with my setup. it works for me.. well kind of..
Good advice but not an answer to the question folks,
Um tom, is that an Arduino? Are you running 24v direct into A1?Daz
You have not attempted to answer the question either - for very good reasons IMHO....R
Answer is, don't. Just buy a premade battery monitor. Your use should have been monitored this whole time. How far were the batteries discharged? Even 'deep cycle' batteries should stick to about 50% discharge, even though they can withstand 80%, depending on battery and system. I can't even make sense of how you have your batteries hooked up. It sounds like you have series pairs of batteries that are then paralleled. What's your charging voltage? Is your system 24V?Please explain what it is you want the Arduino to do. Because if the bank is discharging unevenly and they're connected in parallel, then there is nothing for you to do short of disconnecting the faulty bank when it gets lower than the other, and basically just run on half of your batteries and making them last half as long. And if that was your intention, you need a relay that can handle that wattage. 'Pull a load on the blah blah blah' You're going to need to spell that out because I have no idea what that bit means. The short of it is, you are trying to fix something before you have even bothered to understand the problem. That often leads to unnecessary effort and money, which I don't think you're too eager to spend much of either.All it may take, as a sensible first step, is to stop by an AutoZone or some such shop that offers free battery health checks. Since you have so many, tip the poor guy. Find out which battery isn't up to snuff. Then come back here and stop ignoring the advice given.
Have a look at #16