how to get it to auto renew ssl? or add to cron?
It should auto-renew by default, but will fail if DNS resolution isn't correct for the service name subdomains and/or if you have http -> https redirects in place. You could try a manual renewal after checking those two areas.
for me it didnt, found websites with invalid ssl, any way to fix it?
http://wiki.centos-webpanel.com/autossl-debug (http://wiki.centos-webpanel.com/autossl-debug)
Anything of interest in the logs?
/root/.acme.sh/acme.sh.log
/root/.acme.sh/cwp_certs/acme.sh.log