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[[File:CAD-v1-savonius.png|border|thumb|CAD of twisted Savonius prototype]]
[[File:Savonius-prototype-v1.jpg|border|thumb|V1 of twisted Savonius prototype]]
We attempted to prototype a twisted Savonius turbine to allow a more continuous application of force when the wind turbine spins. Ideally, both sails would be slightly offset to each other to allow airflow from one airfoil to the other. Such an offset can be seen in the following picture that inspired our design. As the Savonius turbine is based on drag, it has a high starting torque, which will allow for lower self-starting speeds.
[[File:Savonius-twisted-airfoil.png|frameless|border|]]
__Aurora wind interface box/rectifier__ - [manual](https://drive.google.com/file/d/1YciYcLJHPdqsU5kGbLKZFx5bYpHzk-JD/view?usp=sharing)</br>
__TCMG-3kW Taechang N.E.T. Generator__ - [online specs](https://tcnet.en.ec21.com/3kW_Small_Wind_Turbine--1105310_1105312.html)</br>
__3kW Discharger Breaker__ Breaker - 3K-DIS-001__ - can't find online manual - </br>
__3kW Dynamic Braking Resistor__ - [instruction manual](https://drive.google.com/file/d/1u_LV9H5tyxtQRk8UA6zT45W3fTitwZu3/view?usp=sharing)</br>
__Anemometer__ </br>
## Anemometer - wind speed measuring
[[File:PorchAnemometer-anemometerroof.jpg|border|thumbjpeg|Anemometer data logger prototype on porch400px]]
We are using a Vortex wind sensor. One revolution per second equals 2.5 mph. Since our anemometer has a relay (a mechanical switch), it creates a _switch bounce_. Therefore, we need a debounce circuit. Please refer to [[Electrical Control Unit]] for the repository and more information.
# Research and background knowledge
## Tower design
We considering building a wooden structure on top of the house to elevate the wind turbine. A tripod design that attaches to the two bump-outs and the gable would make the tower accessible. We are currently considering a tower height of 15 feet up to 22 feet.
[[File:Anemometer-house.jpeg|border|thumb|The tower could be mounted in between the two bump outs]]
Guy wires are an option to secure the turbine as it will be quite large to account for low wind speeds. However, a pole that is merely held up by guy wires is not accessible enough.
## How to charge our batteries
We seek to charge our battery system with the energy obtained from the wind turbine. However, our current system diagram connects the AC rectifier to the inverter, which outputs 110 V alternating current (US outlets). As the energy output from the wind turbine will vary quite a lot, we need to charge the batteries with direct current (DC). For that purpose, we might have to acquire a wind turbine battery charge controller that can handle high voltages (0-600 V from the AC rectifier) to charge our 24 V battery system. Tae Chang offers a [Battery Charge Controller](https://tcnet.en.ec21.com/Battery_Charger_Controller--1105310_1105320.html). We probably need a _600 VDC 24v wind turbine MPPT charge controller 2500W_. Most charge controllers seem to be in the range of 200-300 VDC ([example](https://www.grainger.com/product/55HX52?cm_mmc=PPC:+Google+PLA&ef_id=CjwKCAiA4o79BRBvEiwAjteoYOv_peCpu8ur8vgakfuuD9tEog_f5FFEEgu7gsxPleKhCmGqSbyKoRoCkEUQAvD_BwE:G:s&s_kwcid=AL!2966!3!264955915673!!!g!461787465034!&gucid=N:N:PS:Paid:GGL:CSM-2295:4P7A1P:20501231&gclid=CjwKCAiA4o79BRBvEiwAjteoYOv_peCpu8ur8vgakfuuD9tEog_f5FFEEgu7gsxPleKhCmGqSbyKoRoCkEUQAvD_BwE)), which might be enough considering wind speeds in our area.
## Research papers, articles, media