Man I wish I had enough power for a deep freeze! I hear you there, the aquaponics is a love/hmmm relationship for me. Not that I've dabbled, but I study it a bit and keep wanting to give it a go, but all the issues you present have me nervous, doubly so if I didn't have grid connections... rainy season and you can barely charge your laptop here! But I don't have power hungry toys anyway so I literally make due with a crummy old 75W panel on loan from a friend. The biggest thing though that really appeals is the water saving, if you fine tune it I guess. But it would be interesting to compare the water efficiency of Aquaponics vs say hugelkultur beds or deep woodchip compost like Jean Pain would do. I hear stories of people getting one rain in the start of summer and it lasting 8 weeks or more! Who knows? maybe the power'll be better used to freeze produce anyway