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Message:: [QUOTE="Brandt, post: 12015390, member: 96019"]Freightliner is using 8 batteries to power the park smart system. My truck has 8 batteries to get 8-10 hours of electric a/c.  It been a while since I sat in sunlight to test the system. It could cool sleeper with the sleeper curtains closed maybe up to 90f. Optimize Idle has Interior Comfort Mode, that setting will idle the engine basically all day or stop and start engine all day. It will start the engine when the electric a/c can't keep up with the summer heat. The system will do automatic parked Regen also after 6 hours of idle time on the engine. I can't say it would be very good in Arizona at 100+f. It works good if you sleep at night. Not sure if SFI is only getting 4 battery setup but our had 4 more batteries behind the sleeper between the frame rails. If anyone remember the freightliner Century truck had their 4 battery back there. It's actually the same plastic box freightliner used back then[/QUOTE]