Zeroavia is about to test fly it's first DO-228 testbed, within the next few months. It has Hydrogen fuel cell on one side and normal combustion on the other for test purposes. You can look it up, most modification is in the engine nacelles, so no massive fuselage or airframe tweaking as suggested here, then there's the electronic side of things to manage the system. They are partnered with Bombardier and PWC to have a viable power system for the Q400 by 2025 or so. Both the SAAB and Q400 share large nacelle space for this technology and I assume some sort of tanks/batteries can be fitted where original fuel tanks were instead of AVTUR, or simply in the rear of the nacelles. Spreading batteries out through the wings would not be difficult either, which would aid cooling, and ability to bomb out through the lower surface of the wing should they meltdown, this would avoid ZFW issues with fuselage mounted stuff. If smart you could run the heat dissipation through the leading edges to assist deicing.
I do feel though that the major issue is more going to be pressurisation and de-icing in flight as some form of air pump/compressor will be needed obviously as it lacks bleed air systems. That being said there's some pretty neat low voltage kinetic deice systems that work without heating required, Russians have been using it for years (They hold the patent to it so the US has avoid it in favor of traditional boots).
Last edited by 43Inches; 1st Aug 2022 at 22:25.