Is this AC adapter correct for my DC fan?

nyoffgrid

I bought this cheap AC to 12V DC adapter to use with my fan in winter. Can someone confirm the adapter is properly sized? 

This is the adapter: https://www.amazon.com/dp/B0CKYRBRWM?psc=1&ref=ppx_yo2ov_dt_b_product_details

This is the fan: https://www.amazon.com/dp/B0955WB2KL?ref=ppx_yo2ov_dt_b_product_details&th=1

And another question: What size circuit breaker for my 100 watt solar panel? 

this is what I bought: https://www.amazon.com/gp/product/B0B55Q8KYQ/

BB.

I did not find a lot about the fan with a quick search... It looks like a 12 VDC stable power supply should work fine (runs at "full RPM"). Quiet and reliable.

"Down side" is it appears to be designed for "low back pressure" applications--If that is how you wish to use it, that fine. If you have a long duct, filter, etc. that increases back pressure, it will not move much air.

For the solar panel... Its Isc (short circuit current) is ~5.9 Amps... I would multiply by 1.25x to prevent "false trips" of breakers/fuses (in North America, typical fuses and breakers are "guaranteed" to not trip below 80% Current, and trip >100% of rated Currenrt--could take minutes to hours to "never" at 100% current, not that accurate). 1/0.8 = 1.25 (value for derating):

5.9 amps * 1.25 = 7.4 amps rounded up to ~10 amps.

Did not find a detailed spec sheet--Which usually lists that "Series Protection Fuse" value... So the 10 amps is my "guess".

Note you only need series fuses/breakers for solar panels when (typically) 3 or more panels/strings are connected in parallel (multiple strings array). Breaker/switch is nice when servicing the solar power system (always connect Vbatt to controller first, and solar panels 2nd--And disconnect/turn off solar panel power first, then 2nd disconnect battery bank).

-Bill

nyoffgrid

Thank you Bill. Current run for fan is 3ft but I will want to extend to 12ft... I will test to see how bad it is. I have a fan gauge to test CFM. 

I know that I do not need a break for this panel - I want it to be able to "switch off" the panel in winter and not have it charge battery and destroy it. it is just the toilet fan battery. In winter I will have the fan run of ac power and let everything freeze when we are away = no smell. 

If you think I am better off with a 12v DC on/off switch vs this break - then let me know and I will do that instead. 

BB.

This fan draws around 0.1 amps... So just about any switch will work. Either switch or breaker will work fine...

The solar panel is just under 6 amps or so... You want to make sure you have a DC rated switch for >6 amps. 12 VDC is not "that difficult" to switch, but DC in general "arcs" more than AC current so you need a DC rated switch.

Sustained Arcing starts around 12 VDC... The panel runs around 17.5 VDC, so "need" DC rated 24 VDC (or greater) for the panel switch. 24 VDC makes a very nice arc welder (the quick and dirty arc welder is 2x 12 volt car batteries in series).

Not that this really applies to your system (at this time), just a nice example of AC vs DC switching for higher voltages:

https://www.youtube.com/watch?v=Zez2r1RPpWY

-Bill