Solar PV overbuild strategy for peak-sun optimized use - advice?

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mike-alanko asked Dec 27, '20

Solar PV overbuild strategy for peak-sun optimized use - advice?

Hello experts,

Thanks for your consideration!

I need some help validating my ideas about solar PV overbuild.

My idea is to build a floating summer-cabin with Sauna, (wood-fired), kitchen, shower, and beds,

I would like to use extra PV power to allow for propulsion of the cabin when there is the opportunity;

If excess PV power is available, rather than store this as battery energy, I would like to be able to go on tour of a small lake.

I have an excess PV modules available and would prefer to install everything without investing extra in batteries.

Is it a workable idea to transfer power directly from PV charge controllers (with a battery buffer) to DC propulsion motors?

How can I best engineer this concept?

Thanks everyone!

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Answer 1 · 2020-12-28T08:40:55Z

spirou answered · Dec 28, 2020 at 08:40 AM

Far too variable output to make sense. Even a small battery is better than nothing as a buffer.

Also, what are you going to do when you run out of sun for whatever reason (tree shade next to shore, cloud...) and need to move?

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Answer 2 · 2020-12-28T11:28:39Z

mike-alanko answered · Dec 28, 2020 at 11:28 AM

Spirou, sorry, I should have been more clear: I will have a small battery - for sure.

I'm just wondering how the charge controller will like this kind of load, how will it perform?

I may have a back-up generator for emergencies, as I won't need a lot of battery capacity most of the time. Trying to balance the investment.

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spirou commented · Dec 30, 2020 at 02:22 PM

It will simply output whatever it can/needs to. Might want tonplay around with rebulk setting but otherwise should work reasonably well for a non critical function

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