Powering a 12volts 18Amp device from batteries - Page 1
Forum section: electronics / beginners

author: This_Guy
author_rank: Newbie
timestamp: January 19, 2022, 05:02:24 pm
content: Hi,I have an LCD/mini computer combo that uses a AC/DC brick rated at 12Volts 18Amps, I want to power it using batteries, I am considering an 24..33.6Volts battery and a buck regulator to provide 12V@18Amp.After some time searching Aliexpress/EBay/Amazon I came out with fake specifications and nothing really.Making my own is an option, but it will take too much time I guess.Any suggestions either for an existing one or an IC with low design complexity?I also notice that the brick is 100V..240V AC, maybe an option would be a battery pack above 100V?

author: mcz
author_rank: Contributor
timestamp: January 19, 2022, 05:25:03 pm
content: Quote from: This_Guy on January 19, 2022, 05:02:24 pmSo the output of your AC/DC brick is rated at 12V/18A? Would be interesting to know what the PC and LCD actually require aka their input specs.But apart from that after some quick looking around it seems that Meanwell does indeed have more or less fitting DC/DC converters in the SD/RSD series. But they cost about 120€ or so.Another option might be to parallel a lot of smaller DC/DC converter modules but I don't know if that's worth the hassle.

author: Grandchuck
author_rank: Super Contributor
timestamp: January 19, 2022, 06:29:57 pm
content: https://usa.banggood.com/RIDEN-DP50V15A-DPS5015-Programmable-Power-Supply-Module-With-Integrated-Volt-Meterr-Ammeter-p-1072236.html?cur_warehouse=CN&rmmds=searchI have had good luck with several models from this manufacturer.

author: BeBuLamar
author_rank: Super Contributor
timestamp: January 19, 2022, 06:33:23 pm
content: Can you just use 12V battery?

author: ogden
author_rank: Super Contributor
timestamp: January 19, 2022, 07:11:59 pm
content: Apart from obvious 12V battery advise, there is 48V battery withPKB4204PI, option and some more like Murata DBE0125V2NBC. You shall avoid oversepecc'ed amazon/banggood/similar power supplies, especially if your device do not have overvoltage protection.

author: This_Guy
author_rank: Newbie
timestamp: January 20, 2022, 08:16:03 pm
content: Quote from: mcz on January 19, 2022, 05:25:03 pmThank you, I will take a look inside , perhaps there is a way to power the LCD monitor and the mini pc from different sourcesThank you all for the input.

author: This_Guy
author_rank: Newbie
timestamp: January 20, 2022, 08:47:16 pm
content: Ok, inside there's a spliter board, the mini pc requires 12Volts @ 12Amp, the LCD requires 19Volts @ 1.3Amp, so I guess the spliter board contains a step up converter.I can easly power the LCD with an XL4016 module from a 8S(24..33.6Volts) packNow I need a module capable of 12Volts @ 12Amp or more, I did had some from previous searches from what is available localy and:Ridden DPS5015 is now in range of use, however, I can only get it on Aliexpress/Bangood and that will take some timeSZBK07 contains a terrible review on youtube, so skip it, or find a better review.this 200W 15A reviewhttps://youtu.be/glDXTyNsbWwis outputing 12V @ 12Amp but my russian isn't greatDid I miss any other modules ?

author: This_Guy
author_rank: Newbie
timestamp: January 20, 2022, 08:56:31 pm
content: Quote from: BeBuLamar on January 19, 2022, 06:33:23 pmThank you for sugestion, I have plenty of RC battery packs, so it will always be a multiple of 3..4.2Volts, the 4S when fully charged is 16.8Volts so it requires some conversion, not to mention thick cables to handle 18Amp (or 12Amp now), so I am thinking 8S.

author: Kim Christensen
author_rank: Super Contributor
timestamp: January 20, 2022, 09:06:09 pm
content: Instead of looking at the 12V/18A brick powering the mini PC, why not look at the spec on the mini PC? I'll bet it has a built in switcher which has a range of voltages that it'll work with. So your RC batterymightwork just fine if connected directly.

author: thm_w
author_rank: Super Contributor
timestamp: January 20, 2022, 11:24:29 pm
content: Quote from: Kim Christensen on January 20, 2022, 09:06:09 pmMight, and if you miss one small IC its blown and game over.One obvious one is fans, they are rated for 12V, and would likely be directly connected to the input.