I don't quite get your question but his worth a try, if I am understanding you. Add this function to your functions.php or a related file
$permalink = get_permalink($post->ID);
$excerpt = get_the_content();
$excerpt = strip_tags($excerpt);
$excerpt = substr($excerpt, 0, $count);
$excerpt = substr($excerpt, 0, strripos($excerpt, ""));
And then return this code in your template with desired number of characters in the function.
Full code in this gist https://gist.github.com/bahiirwa/d773a50708fbd25a3b5f98823a2a296b