They probably cost more (24 volt) because a lack of scale. 12 volt is by far more common. 24 is mostly in large equipment and trucks. Like bulldozers or semi trucks. The lower sale volume and lack of demand vs 12 volts (massive market) means its more specialized and expensive. Great video, gives me lots of ideas.
I've been trying to think of ways to use solar in my cheap amazon greenhouse build, and the algorithm led me to your videos. This series is amazing and thank you so much. I've learned so much and I was leaning towards just using power from the grid in my greenhouse, but now I am considering solar. I was also trying to think of the cheapest way to run those fans at night off of a battery, but I am going to continue doing research until I find the best solution.
@pat2965 Most welcome :) your feedback is very encouraging, glad the videos were useful. What if you switch to grid supply at night? That could be an interim step while you research energy storage. This is what I've done in years past and it brought me into solar gradually over time
fyi in car dashboards is another type of blower fan. easier to direct the output of air. was interesting to listen to the different air output with different amounts of sun. (direct coupled to solar panel)
Two 12s in series is 2 watts more, but, but if you used one to bring air in and one to exhaust air or if ypu had the sofit venting to make two exhaust at each gable, i can only imagine twice the air flow, even though you could hear the speed changes between the fans... to compare apples to apples we need to get rpm and / or cubic ft per min comparisons to see which fans are most efficient... given the power consumption... great video... ive been thinking about car fans for some time with solar... love to see your install...
@dougscott2408 Good thinking sir. Thanks for the positive feedback. CFM and RPM data would be great to have. Hope I can cover that in the next video. Most recent install is via the windows in the largest shed (they have a screen, plus no need to damage the shed further) 12v car fan + 12v BLDC fan + 150w solar. Unfortunately the gable vents are small, so I open the doors sometimes to move more air. 24v fan + 50w solar for a small metal shed. Works good but might upgrade a little. *For reference all shed fan videos are listed here ru-vid.com/group/PL8a6nRTNyF9NaLLnvv7lxb0F5TGonkPyY
@user-wt4hi2xe4m Good idea but I don't have any means to accurately measure CFM. The max CFM of the 12v 12 inch is 1550 which is probably a bit optimistic. One of those wind speed indicators and some math could solve this question. I might grab one of those when I get the chance.
I have enjoyed your videos on these fans and had the idea before but was un sure how to execute it and your information was of great help, I greatly appreciate it. I do have a question, I have some existing mechanical attic fans that have died from old age. Rather than replacing the 120v AC motor with OEM type Id like to use one of these 12v DC units, the catch is I need to run them into the evening after the sun has gone down. I'm sure I could run them off of some type of battery set up and I am not excluding this yet, however I would rather hard wire these 12cDC units (or any 12vDC units for that matter) off of stepped down 120AC. My existing fans (3) are all wired to one breaker in the panel it would be great to use this wiring to pull this off. I took a chance asking this because I see you answer almost all the questions. I am willing to pay for your advice on this if that is something you do. Thank you
@jeffp7776 Hi and glad you are enjoying the videos... I am extremely overwhelmed at the moment due to health issues and other matters, so I have to keep this short. Just thinking through your project, some kind of 12v AC-DC converter could be an option. They are very common and not too expensive. Probably need 20-30 amps (estimate). Could place one downstairs with a fuse block, and run the 12v into the attic. You can certainly run DC fans instead of AC. I'd under-volt them (~10v) to reduce overheating risks in the attic. The existing wires can be disconnected and used for 12v if needed too. There is nothing wrong with re-using those wires for 12v, as long as they are disconnected from the AC breaker box and have fuses. Hope this helps or at least gives you some ideas? Thanks for watching and supporting the channel!!!
@@solarpoweredge Thank you for the response I appreciate it. Take care of yourself I’ve had some issues lately (healthy for 55 years) so it is a big strain both mentally and physically. Hope all turns out well.
Hi, could you help me understand how 2 fans rated at 80 watts runs just as good/strong or even better then a single fan with a 100w solar panel. Logically it seems like you'd be asking the panel to run 160 watts? I have this setup and would love to run another fan to double the airflow but would like to understand how this works? Just seems like to me is "should" run half as fast or not at all b/c of the watts being asked of the panel when you double the 80w fan? Thanks!!!
@RubberDuc Hello, a solar panel requires a load of a certain impedance (resistance) in order to reach the most efficient voltage. Wattage is simply volts X amps, but that's all governed by impedance as well (Ohms Formula aka law - I/V/R). A 12v 85w fan is not really a good match for a 12v panel, too low impedance. Putting 2 in series develops more power overall because the solar panel voltage actually increases. To understand more about solar panel behavior and impedance matching directly attached loads, please see my video here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dIN7Gzl0fhg.html
@NBC_NCO Around 1500 running wide open unrestricted. But I wouldn't run them that fast all day, they get very hot. I have no available way to measure CFM at lower power levels. Might try measuring RPM with a tachometer for comparison.
