Don't forget temperature effect! when it is cold out, the spec charging voltage goes up. Eg, 14.6v is now 15.2v when you go from 77F to 32F.
You can beat that with a charger that is temperature compensated. Only converter at a reasonable price that has adjustable voltage is the PowerMax LK model (rebranded as "Boondocker" by Randy).
You would want that for your ice-fishing, I imagine. (The PD with CW is stuck at 14.4 regardless of temp)
https://www.boatandrvaccessories.com/products/powermax-pm3-60lk-12-volts-60-amp-power-converter-battery-charger-w-led-light
