Our EMISSION FREE 43 year old Sailboat! - Ep. 4

Описание: After a long 6 months, we’ve completed our conversion to electric propulsion. We installed a 10 KW brushless motor from Thunderstruck, a Renogy 60 Amp MPPT charge controller, and a 335W Panasonic solar panel.

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Info regarding our electric sailboat:

-We have a 25’ Pacific Seacraft. For details regarding our sailboat, i.e, displacement, click here: https://sailboatdata.com/sailboat/pac...

-We decided to use Thunderstruck’s 10KW Brushless Sailboat Kit that came with a 48V motor controller. The minimum battery pack Thunderstruck recommends is 48V and 100 amp hours in capacity. We currently do not have a way to measure the rpms of the motor, only the amps it draws. Since installation, we have noticed that we generally draw 5-6 amps and our solar panel is charging at approximately the same amperage. For information regarding our motor, click here: https://www.thunderstruck-ev.com/sevc....

-We have four 100Ah 12.8V RELiON batteries wired in series. The batteries have a built in BMS that protect them from over or under-voltage, over current, high temperature, or external short circuiting. These batteries can be discharged 100% without damage. Although we have never, and do not plan to, discharge them 100%, we invested in these batteries quite simply for the luxury. A deep discharge does not affect the delivered capacity on these batteries, unlike AGM or other battery technologies For information about our RELiON RB100 batteries, click here: https://relionbattery.com/products/li...

-We have a Rover 60 Amp MPPT Solar Charge Controller from Renogy. Yes, we know, we went way overboard with this bad boy! For information regarding our solar charge controller, click here: https://www.google.com/.../rover-60-a...

-We have one 335W (59.4Vpm; 71Voc; 5.65Ipm; 6.08Isc) Panasonic solar panel. For information regarding our solar panel, click here: https://na.panasonic.com/.../hit-seri...

--The temperature and irradiance (W/m^2) in Hawaii is above STC. We get 8:41 hours of sun per day, but only 6:02 of those are peak sun hours, on average (6:71 in the summer; 5:59 in the winter). The module has a 20% efficiency under STC. Pmax (335W) was measured at 25°C, and considering the avg. temp in Hawaii is 29.4°C in the summer and 25.6°C in the winter, the average temperature difference is approx 2.5°C ([avg yearly temp-STC temp]/2). The temperature coefficient is -.258% for every °C above STC. What this means is that for every 1°C above 25°C, the Panasonic solar panel will decrease in efficiency by 0.258%. Therefore, we lose 0.645% efficiency due to temperature. We likely gain that efficiency back due to the higher average irradiance in Hawaii, but because I don’t know how to find that statistic online accurately I’ll keep in the loss to be conservative. So, theoretically, we will get, on average, 335W*6:02=2,016.7Wh or 2.02kWh per day not accounting for any of the variables stated above. I’m trying to find resources online that explain how to account for those losses, but I’m coming up with “multiply by .75 or .8” with no mathematical reasoning behind it. If you have a mathematical reasoning behind this, let me know in the comments. It seems to just be an estimate of loss due to temp, wiring, etc., but I will use the ambiguous measurement anyway since I’m this far along! Including loss, using the ambiguous percentages, we should theoretically bring in between 1.51-1.61kWh per day.

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Song Credits:
1:00 and 12:12 - Fresh Air Original Instrumental Indie rock/pop by Wayne John Bradley
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2:00 - CLOSER by KaizanBlu
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