I don't normally post to forums but long story short i've been into small diy solar for a while and after a year or two of eyeing the renogy phoenix i finally got one, mostly for camping but also to keep the essentials powered when storms come through. so one possibly two things that i thought would be great products at least for the phoenix would be an expanded battery capacity sort of station. main way i thought was similar to a laptop docking station or make the battery swap-able kind of like the lycan but personally just being able to change the battery at night for a full charged one even if it means turning off the power for a few minutes would be pretty great or just a port to add external batteries.
i wouldn't say they're huge ideas since im really happy with my phoenix and ive been testing it on all sorts of electronics and various charge speeds but if you guys made those products id definitely be in line to add to my phoenix.
interchangeable batteries would be awesome, had another idea as well. if there was a plug on the phoenix so you could use the solar recharge to charge a battery for i suppose either emergencies or to add a little power to a trailer battery while camping