Backup Power

We are looking for a backup power solution that will actually work when needed - currently we have several towers with the AIMS PWRIC1500W D/C to A/C inverter with built in battery charger and switcher along with a marine RV deep cycle battery! This setup is not working for us and we constantly have to drive to the tower and flip an overload switch on the Inverter!

I would like to know what you guys are using for backup power and also the reliability of those backups! Please inlcude model numbers so i can research these devices!!

Also most of our equipment is on gain elevators so wind generated power and even some solar applications.

Thank you in advance!