I decided to go with the SWE2+ model. I am feeding the inverter output to APC SUA1000UXI. Personally, i havent had much luck with the APC UPS since the attached batteries die every 6 months. Instead of replacing the two batteries of APC UPS it is cheaper to replace one 12V battery of the inverter. The UPS is only needed now for transitioning between the mains and inverter power supply.