Recently, I was setting up 2 Victron Energy, Orion-Tr Smart DC-DC charger to 2 fans, controlled by Victron Energy, Cerbo GX. Using Stixs 3D printing, Victron Energy DC to DC/Orion cooling stand and Stixs 3D printing, Victron Energy Cerbo-Gx standoff. Zac at Stixs 3D printing has done a great job of including a 4 pin plug with his cooling stand. You could also use any of Victron Energy MPPT solar charge controllers.
My build steps are with the pdf file attached.
https://w2ure-my.sharepoint.com/:b:/g/personal/mark_w2u_com_au/EQSwwr7ZqyNGq4yBoc0HXJAB5_MCBtRcK23ekq04hhk9Tg?e=j7ipsr
Products from:
Victron Energy https://www.victronenergy.com/
Stixs 3D printing https://www.facebook.com/Stixs3D https://www.ebay.com.au/usr/zacripp_6?_trksid=p2047675.m3561.l2559