Redneck,
I'm curious about where/how your tying into your existing house/farm electrical system.
In my case, my 5.5kW PV system is tied into a panel on my barn that is rated for 200 amps, that already has a 200 amp main breaker (the house panel is cascaded off of this panel, hence the need for a 200 amp main). The 2008 NEC allows a PV system to go 20% (I think?) over the panel rating (so 240 amps, in my case). In other words, I can have a 40-amp backfed breaker supplying power to the panel in addition to the 200 amp main breaker. My central inverter is rated to supply a maximum of 30 amps @ 240 volts (7200 watts, which I'll never hit because my panels can't make that much). However, the NEC requires that I use the 30 amp number and a 40 amp breaker because of the inverter rating. So my panel is already maxed out.
The quandary for me is that I'm inspired by your project and the really low cost of panels right now, and am thinking of a DIY expansion to my system... One option is to increase the size of the array on the existing inverter by about 50%, which pushes me right to the limit as to what my existing inverter can handle, but doesn't change the backfeed amps from a code perspective. Another option is to use micro-inverters for the expansion, but then I'd need to decrease the main breaker in my existing panel from 200 to 150, which would allow me to backfeed up to 90 amps, rather than 40 amps. However, it means I'd only have 150 amps available for my farm when the sun's not shining (that might be okay...).
In your case, you have 100+ amps coming from your array. If you have 400 amp service, then you're probably set... If you have 200, it seems that you might have an issue. I know you said that inspections aren't necessary for you, but my take is that this rule in the NEC is one of those that makes sense... I don't expect that you want to overcurrent your panel by a substantial amount.
Just curious -- I'm definitely not trying to throw a wrench in the works for you.
Jeff