Looking for 12v AC-DC battery charger recommendation.

I'm looking for an AC-powered DC battery charger for supplementing my battery array on cloudy days. I am not looking for an inverter charger, or anything that starts a generator. I have smart and dumb chargers but all the smart chargers I can find are tailored for maintenance free automotive batteries, not an array of golf cart batteries under load.
Basically what I'm looking for is a charger with thresholds I can set. Like it doesn't do anything unless the battery voltage drops to 11 volts and then it kicks on and begins charging until it reaches 13v and then goes back to sleep until/if it's services are required again. Or whatever voltages I set. Because the solar chargers are doing the heavy lifting and just need help every now and then when the clouds roll in.
This seems like a no-brainer product that should be easy to find but I haven't been able to find it, just a bunch of DIY "workarounds". If anybody can make a recommendation I look forward to reading it. Thanks.
Comments
https://www.solar-electric.com/residential/batteries-battery-storage/battery-chargers.html?manufacturer=101 (scroll down on page)
http://www.xantrex.com/power-products/battery-chargers/truecharge-2-2.aspx
-Bill
You are correct, the TC-2 has fixed charging voltages--Depending on battery type and 2 or 3 step charging cycle chosen.
Here is another thread with a charger from Full River that appears to have a wireless charging interface and potentially high programmability:
https://forum.solar-electric.com/discussion/352285/ac-battery-charger/p1
http://www.fullriverbattery.com/series/chargers/fullriver-fr1-chargers
In the same thread, there is a Concorde programmable (to what degree?) charger too (designed for aircraft charging, probably not cheap):
https://www.aviationpros.com/engines-components/aircraft-airframe-accessories/product/10771553/concorde-battery-corporation-battery-accessories
http://concordebattery.com/otherpdf/BC_8000.pdf
Some of the most configurable chargers I have read about seem to be the Inverter-Chargers--I know you don't need the inverter, but it may be cost competitive compared to the few other programmable chargers out there.
What is it you are looking for? Cycling golf cart batteries are not unusual and even the "simple" Iota chargers with the IQ-4 charge control module seem to keep most people happy...
https://www.solar-electric.com/search/?q=iota
Many (most/all?) have an internal 10 turn pot that can be adjusted to change base charging voltage (you have to remove an external cover to access the pot).
-Bill
In general, cycling batteries runs your cost upwards of $0.45 to >$1.00 per kWH (battery replacement costs, inverter/charger/etc. hardware costs, lower system efficiency, etc.)...
So, for most people with utility power, the cost of utility power is cheaper than the added wear and tear on your battery bank. (in California, my summer afternoon peak power costs can exceed $0.46 per kWH--So close to breaking even).
https://www.pge.com/tariffs/assets/pdf/tariffbook/ELEC_SCHEDS_E-6.pdf
If you wanted to estimate state of charge with a simple voltmeter (i.e., when battery falls below ~12.3 volts or so--ref 12 volt bank), and turn on the charger until the battery is >14.4 volt volts or so-->~80% SoC from utility charging)--Not the most difficult thing to do with a modern Raspberry Pi or Arduino or other single board computer connected to a 120/240 VAC power contractor for the external power supply AC input.
You can also go with a shunt based battery monitor and set the "alarm contact" to 50% on and 80% off (suggested values)...
https://www.solar-electric.com/search/?q=battery+monitor
Some of the Victron and Xantrex Battery monitors have the programmable "alarm contacts".
I am sure that there are other good ideas out there too...
-Bill
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
With true deep cycle batteries, we use 50% as a rule of thumb balance between long life and system size / cost. This would be about 12.1v.
Fully charged is generally ~12.7 (may vary some depending on the battery).
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
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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