110AC usage will be A/C window unit, coffee maker, toaster oven, and dorm style refrigerator.
12VDC usage will be LED lights, small LCD TV, fan, small laptop with 12" screen, USB for recharging cell phones.
Will this work for my needs - PD4045 RV?

Is there something that might work better?

Do I have to install a battery immediately or can I add it later? (as funds permit)
Most of my camping is in state parks (electrical hook ups available) or national parks (no hook ups - I would have to have a battery for this)
Thanks in advance for your help.

