i notice that my Schneider xw pro and mppts need to have battery power to turn on and function, so that If you have low batteries, you can't get the inverter on in the first place to charge with solar. i seem to recall that the mppt can be used as a stand alone charger when connected to panels, but if it's in the xanbus network it won't come on unless the inverter is on. anyone familiar with this system to confirm? the other start up issue is the the rapid shut down system which needs a powered "keep live" signal to turn on, and with no power you can't get it to turn on either. from my research on the RSS system, tigo needs a 12v power source to get the stay live signal going, so i can supply a separate 12v battery to boot that if needed, but how to get the Schneider system on without using the back up generator? anyone constructed/designed a way to get this done, and if possible just automatically? ie what i want is a system that will start to recharge itself if dead, from just solar input, automatically, when the sun comes out.