Help with fritzing circuit

I'm not sure I know enough about lead acid chargers to do that safely. A quick google search indicates that there does need to be over charge protection but I don't know how to do it. You would be best off finding help in a forum where there are people that know exactly what they are doing (at least on the charging end). Various types of boost/buck regulators are available from ebay for 10s of $ that will put out 48V (as noted you are going to need that because of your
generator which will give you variable input voltages which is bad for charging).