Re: hi! looking for comments on my 'renegade' install
$2k should get you somewhere around a 4kW grid tie inverter--They seem to be running around $0.50 per Watt... You will just have to look around for a small(er) unit.
There are other types of units that are inverters/chargers/on-grid/off-grid units like the Xantrex SW series talked about on another thread... If you wanted, basically, a Gird-Tied inverter with UPS type function, it seems to be a good place to start.
Of course, there are many other brands out there and I am sure somebody here can give you better sources for what you want (a 600 watt Grid-Tie?)...
Powering your fridge, get yourelf a kill-a-watt meter for $25-$40... It will give watts, VoltAmps, Power Factor, KWhours, and Elapsed Time (as well as frequency)... Unfortunately, the kill-a-watt does not do a good job on peak power/current (only updates about once per second).
Your fridge probably is around a 200-400 watt unit when running, and motors take 2-5x (or more) starting current. You should not damage the inverter if it cannot handle the load (although, if it does not start the fridge, prepare to quickly unplug the motor as it can stall and overheat within a few minutes).
720 kWhrs per year is not an overly expensive refrigerator to run (~$70-$80 per year, or $7-$8 or so a month)... My old fridge from 20 years ago was 3x that amount (much less efficient).
Make sure you know what you are doing with your Grid-Tied system--I would be wondering if your local building inspector would approve the roof-top installation (I think it is required that the mounting system supports 125lbs per square foot), is your grounding correct, do you have metal conduit from your roof to your JBOX/Inverter, that your solar inverter + panels are rated at 20% or less (IIRC) of your main service/circuit breaker box ratings, and I don't believe that THHN/THWN insulation is UV resistant.
All the above will have to be inspected, and you will need a lockable switch by the meter to disconnect the solar inverter, and to fill out the utility's forms (insurance, building inspection sticker, inverter identification).
If you connect all of this yourself without approval, the utility will probably cut your service, may sue you, and if somebody is injured or killed, you will probably have to prove that it was not your fault.
Not trying to scare you out of having Grid-Tied Solar--but it is almost the same cost and work to do it right as to do it wrong. It is not that hard to do the second time--However, how to do it right it right the first time without any help or direction is not always obvious.
Since I am not an expert in NEC and other codes, take what I am saying as guidance as to where and what to look for... Others here (and locally) will be able to better answer your questions.
20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.