Yes, but I usually add my public key to the authorized_keys file and turn off password authentication once i do login with a password. On top of that, I have a sshpass one line command that takes care of this for me. It’s much easier than trying to manually type a password for the next time. I save it and just run it every time I think about using password login. Next time I need to ssh, I know the password login is not necessary.
sshpass -p ‘PASSWORD’ ssh USER@IP.ADDRESS “echo ‘`cat ~/.ssh/id_rsa.pub`’ > ~/.ssh/authorized_keys && echo ‘Match User !root
PasswordAuthentication no
Match all’ > /etc/ssh/sshd_config’ && exit” && ssh USER@IP.ADDRESS
At the next reboot, your system will now only accept key logins, except for root. I hope the root user password is secure. I don’t require it for root because if a hacker does gain shell access, a password(or priv esc exploit) is all they need to gain root shell. It is also a safety net in case you need to login and lost your private key.
As the other guy said, the only hard parts for you will be to negotiate staying on the grid or cutting off completely.
I ran all the numbers and you are paying a ridiculous price for solar. You will see it pay it self off in 50 years, which I doubt you will care about at all once you are 50 years older or giving the house to your next of kin.