I really like Victron controllers. They have a very advanced Android/Apple phone or tablet interface or via cable to a computer for more options. The bulk/absorb and float voltages are controllable down to 1/100th of a volt, absorb time is controlled by current acceptance and can be time limited by the user (adjustable). The controllers are very small, do not need a fan, and stay very cool. The larger capacity units come with a built in programmable relay. They are also very inexpensive compared to other brands. The older ones require a Bluetooth dongle (blue solar) and the newer ones have it built in (smart solar). They have regular software and firmware upgrades to their equipment, the upgrades are all automatic via your cell phone, no effort or computer knowledge needed, when you open the app the firmware will auto update, and the software is via google play or apple. Auto logging of 30 days of data, nice graphical interface of bulk/absorb/float, shows daily total wattage, high/low battery voltages. They have a huge range of integrated equipment such as battery state of charge monitors, inverter/chargers that can combine your generator power with your inverter power, large LIFEPO4 battery systems, etc if you have the money. Even the low end cheaper MPPT solar chargers are high quality. I have 3 of them installed and they work flawlessly.
In my personal opinion they are the most advanced controller out there, they are a world wide manufacturer and in use on many high end marine and RV applications. Just type VICTRON in YouTube and take a look at their products.
LOL while looking up these controllers I found one on Amazon a 75/15 non Bluetooth for $69, I just bought it! Last one tho, sorry...
One of my favorite things about Victron is I use an old no longer in use cell phone live monitor my system, just Velcro it to a wall and plug in to a usb port.
Right now on Amazon the 15 Amp 75 volt max with built in Bluetooth controller is $130
MPPT 75/15
Also on Amazon the 30 Amp 100 volt max model with Bluetooth dongle is $250
MPPT 100/30
Read the reviews on their controllers on Amazon, they get very high marks.
BTW you need the Bluetooth dongle (or a built in Bluetooth model) to program them to your specific battery and get updates, I do not recommend getting one without it. They are pre programmed for standard AGM battery specs.
LOL while looking up the prices I noticed there was 1 for sale on Amazon new for $69, a 75/15 non Bluetooth one, so I bought it, score!