As You can see, You "un-secret" it and You started to get the proper responses.
It is not curiosity, it is to insure that the proper information is available for you to get the proper responses.
Also, you can get a telecom battery charger, making sure it is not with a ferro-resonant transformer because the generator does not have an accurate 60 HZ frequency and ferro-resonants most do require an accuracy of 60 +/- 0.5 Hz.
Curiosity in this group is not for me to "enhance", there are many reasons for such statement, which I will not define.
Nando