We also purchased a 2021 Chassis SS-AGILE. We have used the 400 amp Lithium batteries in numerous environments. Our experience after a few modifications, soft start on AC, Victron to monitor usage and relay to autostart engine. AC in 80 degree weather low humidity, fridge, we lasted 3 hours, batteries at 17%. Fantastic fan, fridge, lights, TV, cpap, we lasted 30 hours, batteries down to 24%. Depending on what your usage is as microwave, cooktop will deplete batteries quickly, the Victron will monitor and give you a good idea of time remaining if leaving a pet in unit. The FIREFLY warning is at 50% should be updated to 20%. The unit really isn't geared to boondocking for days with only 400 amps of Lithium but with autostart it allows us to sleep through the night without having to get up to start engine or if away from the unit our pet is safe. Solar controller in bad location but should be simple read to determine if operating correctly. I use cellphone on record to view operation, it cycles readings.