Originally Posted by redpointist
I have a bogart engineering trimetric 2030 battery monitor
and matching bogart engineering sc-2030 charge controller.
are 6v Duracell GC2 wet cells from Sams club wired into a 12v system.
0.5% of 600ah would mean at 100% full they should only accept about 3 amps at 14.4 volts once fully charged?
The trimetric has a lot of settings to play with, but I think it was indeed switching to float prematurely. I suspected it may be, so tempararily increased float voltage to 14.4 volts (from 13.5) to see how long it would accept charge at the full rate, and over the course of a few days it seems to added 20% capacity to the bank even though the charger
thought it was at 100% already. Even now it's still accepting almost 1.5% of capacity.
Since I'm using the batteries
every day and unlikely to ever have them fully topped off for long (if ever), does it make sense to permanently ignore lowering voltage for float and just let them charge daily at 14.4 volts for as long as the sun is up? The batteries get a break from the 14.4 volts every night when it drops down to 12.6-13 depending on how much load I'm using.
Yes, but only for while you're on solar
only and actively cycling.
To me, that means No.
The "gotcha" phenomenon root cause is the SC basing its algorithm off measuring its amps **output**, a fatal flaw. Since your SC is using the actual amps **accepted by the battery** at the shunt, it should be pretty easy to get the Trimetric adjusted to work
Setting FloatV = AbsorbV is to me just a kludge workaround for those with less accurate monitoring gear
But in the end the TM **will** drift if you're not getting to 100% most cycles, besides the bank longevity hit.
In that scenario consider using a SmartGauge to be able to cross-reference, if the extra cost is not an issue.
You state - and seem willing to accept - that your bank is rarely actually getting to true 100%.
So using that workaround, as noted you will need to manually change the TM settings in order to get a proper safe float when your bank actually does get to Full, not least when sitting on shore power
and/or not cycling.
I think personally the goal of a good setup should be to actually get to 100% as often as possible, even if that requires a little genny run in the morning, ideally while doing other things like charging
, doing dishes, laundry
, making water
But even if that's not often possible, try to get to Full often enough to help the Bogart to be accurate, and especially as it is your solar
controller - do what it takes to tweak the settings to ensure it transitions to FloatV only **after** the bank is truly full.