If the solid red is on pack voltage is less than 122 and you are at max current the charger will output. Also known as constant current stage or bulk charge. Blinking red is the next taper step where pack voltage increases up to the programmed turn off point, which should your maximum pack potential. This is constant voltage stage where current is a couple of amps only but the voltage is increasing. The pack is only at charger set voltage when the light goes green. My truck takes 8 hours to go from mostly empty to full
OLD USAF saying from Vietnam era electronics tech school: RTFI