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Fan Wiring
#11
(04-14-2019, 12:08 PM)Cherry67 Wrote: After the inspiring comments of the others, i just assume the current of both fans to start required is more than the panel can deliver. There is a buck converter available which has an MPPT ( wich is an undervoltage shutof) in the Chinese market, i will add the link later. Perhaps this could work.

Would this one do the trick?

https://www.ebay.com.au/itm/142520044960....S1.R1.TR2
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#12
You probably want something that can also maintain a constant current. Your issue is that your fan can probably run at a lower voltage, but it doesn't have enough current to run at 12V. I had this issue on a a pump that requires 12V and 5 Amps.

So for example if your fan is 1A, and your panel is outputting 12V 0.8A (12V*.8A=10W) so it's not enough to start the fans. But your fan is probably fine running at lower speeds if the voltage dropped to 10V and thus increasing the current to 1A (10V*1A=10W).

This is a CC/CV that might work. https://www.ebay.com.au/itm/DC-DC-Auto-B...3068200555
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#13
(04-14-2019, 01:49 PM)Flyingwills Wrote:
(04-14-2019, 12:08 PM)Cherry67 Wrote: After the inspiring comments of the others, i just assume the current of both fans to start required is more than the panel can deliver. There is a buck converter available which has an MPPT ( wich is an undervoltage shutof) in the Chinese market, i will add the link later. Perhaps this could work.

Would this one do the trick?

https://www.ebay.com.au/itm/142520044960....S1.R1.TR2

no. I mean

https://www.ebay.com/itm/MPPT-Solar-Pane...2711371638

or

https://www.ebay.com/itm/5A-MPPT-Solar-C...2672893123

its the same module, one is with display of current and voltage on in- and output. Would be fine for you because you have no Multimeter.
btw you should buy a multimeter, at least a cheap one. You can hardly do anything without.
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