SOC meters for small systems

I would like to have a SOC meter on two different systems; one is tiny; 200Ah @ 12V and the other is not much bigger at 600Ah @ 12V. What's a good system these days? A lot RVers use Trimetric but I'm not overly impressed with them as it's strictly a coulomb counter. Any others? I don't really care about monitoring all the different sources; I just want to know how much is left in the batteries.
Comments
IMHO, the only way to accurately measure SOC and monitor battery health in lead acid batteries is with regular SG checks.
"How much is left" is sort of a squishy number as well. If running a big load relative to bank size, the effective watt-hours available will be less than a small load, for example.
Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
So that's why I use squishy terms, because with lead-acid there is no accurate way to really determine the charge of a battery. I'd like to get close, relatively inexpensive, and convenient.
Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
The sensors were fragile and pretty reliable. I never moved forward with them as in a mobile environment AGMs make far more sense.
UPDATE: Just checked the website; the sensors are no longer available.
VictronConnect is what I use
I use the Victron , seems to be good . Input the % efficiency and Purcurt of the battery . It then makes the required calculations . Still as previously said , it is still only a guide . Not an accurate number .
IMO, the key to accurate SOC via coulomb counting is to have a daily reset to a known state. With a system that adaptively corrects out it's errors for your typical usage.
I am available for custom hardware/firmware development