Converting 12v to 24v device to work on car battery

[xboxhaxorz]

I have a small device that operates at about 72 watts with a 24v power supply, i want to be able to use the device on a car battery but since it will be at half voltage i thought about using something similar to this

http://www.ebay.com/itm/5A-DC-DC-Boo...-/262974092676 or this https://www.amazon.com/dp/B01EFUHGMU...ure-scomp-wm-4

Would i need anything else and most importantly would this be a safe and reliable way to use it on a car battery, since im sure these electronics are all made in china i wonder about the quality?

[budm]

Re: Converting 12v to 24v device to work on car battery

I have a small device that operates at about 72 watts with a 24v power supply, i want to be able to use the device on a car battery but since it will be at half voltage i thought about using something similar to this

http://www.ebay.com/itm/5A-DC-DC-Boo...-/262974092676 or this https://www.amazon.com/dp/B01EFUHGMU...ure-scomp-wm-4

Would i need anything else and most importantly would this be a safe and reliable way to use it on a car battery, since im sure these electronics are all made in china i wonder about the quality?

72W at 24W = input current requirement of the device is 3A, so if you are going to use the step up converter to boost the 12V to 24V DC at 72 W so the input current to the converter will be at least 6A, so you need the converter that is rated higher to have headroom and also due to inrush current the converter may encounter. The claimed eff. is 94%.
Can that board actually do 3A at 24V DC output?

[xboxhaxorz]

Re: Converting 12v to 24v device to work on car battery

The 2nd link says it supports 10 amps, so that should be enough room for the inrush current for 6 amps

[piernov]

Re: Converting 12v to 24v device to work on car battery

https://fr.aliexpress.com/item/400W-...812373773.html
That's obviouly not gonna do 400W, but it should be OK for 72W. You may want to replace the capacitors as they're gonna be crap.
I've used it at around 80W without issues but it's not running 24/7 and I didn't try to go higher, I didn't have a high inrush current either.

https://fr.aliexpress.com/item/Numer...785932830.html
This one may leave a bit more room if needed, but capacitors are crap too.

https://fr.aliexpress.com/item/200W-...656842319.html
I also have this one but I don't think it's gonna be enough for you.


Even though those chinese products can have a decent build quality, the capacitors are almost always crap, and the rating is often higher than what the module can withstand (often due to insufficent cooling). Always monitor the temps, an upgrade to the cooling system may be needed (better TIM, bigger heatsink, adding a fan) if you're drawing a high current for a long time, if it's enclosed inside a box or inside a warm environment. If it's running inside a car for example, depending on where you install your device, there might be high temperatures and no airflow at all.

[budm]

Re: Converting 12v to 24v device to work on car battery

The 2nd link says it supports 10 amps, so that should be enough room for the inrush current for 6 amps

I love the Chinese specification, at 10A OUTPUT @24V DC, the input current will be 20A! (@100% Efft, but that is not the case)) looking at the wire gauge on the input side, it sure does not look like it is going to handle 20A for too long.
But for your project it may be OK.

[WarHawk8080]

Re: Converting 12v to 24v device to work on car battery

Try this
http://www.ebay.com/itm/like/141316770525?ul_noapp=true

I even remixed a really cool case for em
https://www.thingiverse.com/thing:1859712