Review on ⚡ Golf Cart Voltage Reducer Converter 48V to 12V 10A 120W - Optimized Step Down Transformer by Donald Phillips

I used it to build a battery pack with AGM batteries that supplies 12V DC. The output voltage is 12.1-12.2 and I have watched the batteries drop from 13.3 to 12V inside without the output voltage fluctuating. I'm not sure how effective it is, but I have to say it's pretty good. I use it to power my telescope mount, raspberry pi, wireless bridge, camera and 2 dew heaters and I have still not been able to get the batteries below 12v even after several nights of use. That means I can't talk about how the up part works, only down. I expect it will work just as well at 12V as above, I have no reason to suspect otherwise.