I had a similar experience when I bought my 460 5 years ago. I replaced batteries as well, but in the end the fridge uses too much power initially for the freedom 2000 inverter. The fridge and freezer are designed to run twice a day when not at dock, similar to power boats. It runs about 45-50 minutes each time. The initial draw is higher than the rating of the inverter. I could sometimes get the inverter past the initial draw. Eventually I solved the problem with a larger 3000 inverter which can handle the initial load. The fridge/freezer consume approximately 60 amps twice a day. When I am out for several days, I run the fridge off the inverter at night and generator in morning. If I am just out for a weekend, there is no need for the inverter. Eventually I will replace with a more efficient 12v system.