Solar COB Houseboat? HAF just wondering

So basically, the summary: how to build a floating COB LED illuminated aqua/hydroponic solar powered grow room out of a shelled out houseboat. It needs to be able to draw ~1.2-3.6kW/h or 21.6-64.8kW/day. Multi-farad capacitors? Tesla's Powerwall? Constant current. Running DC? No sloppy inefficient AC conversion, right? How much of a footprint will the PV take up? How much battery do you need? Can you run the array off of a powered rail?

For lighting I am really liking what I see w/ the CXB3590s. I have to credit growmau5 for his 6-part video primer for making me interested in this stuff again.

It also needs be able to progressively filter and pump a large volume of lake water coming in and going out. Preferably a purgable recirculating system. What volume of water could be produced and cycled without having a large onboard holding tank?(This is dependent on a WHOLE lot of variables, it's more a self question)

For the thermal energy dissipation I was thinking of heat tubes heatsinked in the water, over using a pressurized liquid cooled system or mechanical fans and ducting. It would make for a passive exchange, have fewer parts and would be incredibly efficient. You might even be able able to use the hull of an aluminum craft to take the thermal spread.

I think with the efficacy of lights and PV panels today we are getting into some interesting territory on how efficiently and feasible this can be done. Maybe not entirely off grid, but close. Who knows? This is just the birth of a personal mental exercise. Economically, I be so po. I have way more questions than answers but it is a novel thought to me. What am I missing? How idiotic of an idea is this? Thanks for your time.

A 100w solar panel takes up 6.85 square feet. It produces about .4 kwh per day. Even at your minimum required draw that would be 54 solar panels. That is a 20x20 space fully filled with solar panels.

For this to be at all realistic you would want to use the sun directly (glass/plastic roof) for lighting and use solar panels only to extend day length when needed or supplement the sun when day length extension is not needed. You would have to rig up a powered/timered shade/awning to cover the grow when day lengths are too long for flower.

Using solar to power grow lights is still going to be very difficult without a massive/expensive solar panel array.

I contemplated a solar powered shed grow, but the only realistic way to do it was to use the sun to grow and solar to run your much lower power electronics

Ah reality. I was thinking sheer size of the pv layout might become an issue. I had the thought of the green house option as well but wanted to see if could be done solely through solar. Seems highly prohibitive based on your input. Even though on the boat(45x14) that sparked this thought the roof area could be close to 20x20, at 30x10 very roughly. Roughly and at a minimum. I like the idea of a greenhouseboat, with poly roofs/walls and a sunshade, more and more. One day the tech will get there.

Now that we have eliminated most of the PV and COBs, Remaining supplemental COBs could most likely be passively cooled. So bye-bye weird heat tube idea.

SO how crappy is the thought of recirc'ed lake water? How filtered would it need to be? What would be the better hydro system to use? DWC, NFT, etc.? What sort of testing would need to be done to make sure you aren't just pumping diesel laden water through the garden?

The top of the water will be most contaminated, so you would want to pull from as deep as possible. Take a sample and have it tested. If contaminants aren't too bad, I would probably just use a combo of a fine sediment filter and a carbon filter.

If you have bad bacteria issues you could also fill a drum and treat with chlorine/bleach, then leave to bubble for a few days before using.

The water will likely have a fair amount of nutrients already, so you would probably want to run custom nutrients designed for your water. JR Peters offers this service.