Also am i correct in saying it should be fine with the relay higher as long as I don't change the breakers and fuses for higher ones?

I currently have a RL180-12 100amp relay that I believe has stopped working due to it being parked up with a solar panel attached (or its just old)
my question is could i replace it with a RL180-12 120amp relay as I can get one of them delivered tomorrow or will this make more problems for me?