We have a Victron 100/30 MPPT controller with wiring terminating through a fuse to Anderson connectors, kinda like yours. It has the built in bluetooth, so no dongle. I made up a 25 foot extension cord with Anderson on one end and MC4 on the other to hook up to a Renogy 100 W rigid panel. It works great. A couple of thoughts are that the bluetooth connection to the smartphone app is pretty nice. But if you had a
battery monitor with a shunt (like a Victron BMV) then you could probably do without the dongle. And I agree about going to a ham radio shop to have them put Anderson connectors on wire for you. I used the Anderson 30 amp connectors and it takes a special technique in addition to the Anderson tool to make them up correctly to 10 gauge wire. So let someone else do it for you. And the 100W Renogy weighs about 25 pounds and is bulky.
We also have a Acopower flexible suitcase panel like this one:
https://smile.amazon.com/ACOPOWER-Po..._1_fkmrnull_3?
It clips onto the
battery terminals but also has MC4 and SAE connectors so it is very versatile. We use it with our teardrop trailer with the
battery clips but also can boost
solar power input to the LilSnoozy by hooking it up in parallel with the Renogy. It only weighs 7 pounds and works fine with its included PWM controller.
Long winded answer, but if I were you I would sell the MPPT controller and buy an Acopower suitcase flexible panel like the one above. It works really well and is super easy to use.