DC to DC converter for small electronics

Camper_Jeff_&_Kelli wrote:
Hey Matt, So I take it you're trying to eliminate a 120 volt wall cord and go straight into the 12 volt connector using the 12 volt system of the house which will be 14.4 or 14.6 at times. 13.7 or 13.2 at others. and 12.8, 12.6 and going lower as the evening progresses until the engine or generator start charging. Sounds like the Victron may be the solution you're looking for. Since this NAS is going to be rattling around in the truck camper, are you going to be using SSD drives? Will your NAS accept smaller 2.5 drives? I have a couple LACIE 4T USB drives RAID capable if desired. It's a much simpler solution than a hardwired NAS unit in the TC and easier to take with you if needed. Probably not as capable though as a true NAS designed to serve several work stations but will easily work for one person/computer. I saw the RV GEEKS on YouTube the other night, released a video on their electronic communication and NAS system. They had a NAS with I recall 6 full sized bays but I don't recall if they plugged into 120 volt or adapted to use 12 volt. They have a huge LION battery system so I suspect they used 120 volt and let the unit make it's own clean power. Hope it works out whatever you end up with.

The nas in question is a small low power single drive qnap unit, it will easily use any 2.5 or 3.5 inch sata drive (it currently has a 6tb wd red pro nas drive in it, that will be getting swapped out for an intel ssd).

Its primary purpose is to act as the house plex server (do it yourself netflix), that we'll be syncing what we want for a trip from the big plex server at the house.

Its not really used for anything, I bought it for a short term project a few years back and its been collecting dust ever since.

So, I'm combining it with the campers network extender as part of the Amerigos systems.

theoldwizard1 wrote:

FWC wrote:
This will do what you want:

Victron DC-DC Converter

Output range 10V - 15V.

Do the "double conversion" (DC - AC - DC). Safer !

The converter is adjustable over that range. It will regulate the output to better than 0.2V of the setpoint with less than 0.002V of noise.

This will work well for this application.

I am on my phone so couldn't read through the entire thread and don't know if this has been mentioned but you are looking for something like this I think.

JoeChiOhki wrote:
So, something I also found during my searching, which might be a viable solution is Pico makes a small DC-DC Converter for UPS type functionality.

https://www.mini-box.com/picoUPS-100-12V-DC-micro-UPS-system-battery-backup-system

Requires 15V - 18V input.

FWC wrote:
This will do what you want:

Victron DC-DC Converter

Output range 10V - 15V.

Do the "double conversion" (DC - AC - DC). Safer !

Hey Matt, So I take it you're trying to eliminate a 120 volt wall cord and go straight into the 12 volt connector using the 12 volt system of the house which will be 14.4 or 14.6 at times. 13.7 or 13.2 at others. and 12.8, 12.6 and going lower as the evening progresses until the engine or generator start charging. Sounds like the Victron may be the solution you're looking for. Since this NAS is going to be rattling around in the truck camper, are you going to be using SSD drives? Will your NAS accept smaller 2.5 drives? I have a couple LACIE 4T USB drives RAID capable if desired. It's a much simpler solution than a hardwired NAS unit in the TC and easier to take with you if needed. Probably not as capable though as a true NAS designed to serve several work stations but will easily work for one person/computer. I saw the RV GEEKS on YouTube the other night, released a video on their electronic communication and NAS system. They had a NAS with I recall 6 full sized bays but I don't recall if they plugged into 120 volt or adapted to use 12 volt. They have a huge LION battery system so I suspect they used 120 volt and let the unit make it's own clean power. Hope it works out whatever you end up with.

So, something I also found during my searching, which might be a viable solution is Pico makes a small DC-DC Converter for UPS type functionality.

https://www.mini-box.com/picoUPS-100-12V-DC-micro-UPS-system-battery-backup-system

These are designed for continuous power to electronic devices (it also has a built in charger, but if you never connect the thing so the charger kicks in, it will always just be a converter), which need a consistent 12 volts out for the 12 volt bus rail inside them.

jimh425 wrote:
I suppose you could use a voltage stabilizer/regulator. I don’t know if the voltage would be constant enough. My guess is that if you are going to have multiple network devices, you’d be better off with AC and a computer lab quality surge suppressor/power strip.

Alternatively, you could have a dedicated 12V circuit for it and use some type of trickle charger that can keep the voltage of the battery relatively constant.

I suspect it needs to be at least as stable as the 12volt leg on a PC power supply, as its doing its own step down internally to create a separate 5volt +/- circuit on the board in the NAS.

My plan is to run appropriate DC-DC units for the two main devices (NAS and Network Extender) as those will see more use in transit than the TV and Roku will, which will just get used on the inverter circuit.

FWC wrote:
This will do what you want:

Victron DC-DC Converter

Thank you, I was having a devil of a time remembering the brand and what these were called from the last time I saw them pop up in regards to flat screen TV discussions back in the past on the forum.

otrfun wrote:
This might work.

That's one of the one I found in my searches, but wasn't certain if that was a stable enough unit.

FWC wrote:
Depending on how stable the output needs to be, you may do better with a higher quality DC-DC converter. I use one of the no-name cast aluminum ones with my MPPT solar controller to use it as a DC-DC charger and the '24V' output on that is all over the place depending on load, luckily it doesn't matter in that application.

Yeah, that's one of the reasons I asked, I remembered there being discussions on this in the past here, but I couldn't remember the key words for the technology used, so wasn't turning up any results.

What I did find I was wary of because its no-name chinese made stuff and those rarely produce a PC power supply grade level of voltage.

Bedlam wrote:
DC to DC conversion typically uses pulse width modulation with a feed back loop to keep the voltage regulated at a set reference under varying loads. The power is pretty dirty until filtered through some capacitors. It used to be easy to pick up all these components and scale it to your needs, but stores and user knowledge have been dieing out.

Yeah, finding any kind of small components is getting troublesome. I couldn't even find the same single pole 12 volt illuminated switches I had bought less than ten years ago (I ended up cannibalizing the originals out of Mr. KIT because I couldn't find anything nowadays half as decent a quality).

DC to DC conversion typically uses pulse width modulation with a feed back loop to keep the voltage regulated at a set reference under varying loads. The power is pretty dirty until filtered through some capacitors. It used to be easy to pick up all these components and scale it to your needs, but stores and user knowledge have been dieing out.

Depending on how stable the output needs to be, you may do better with a higher quality DC-DC converter. I use one of the no-name cast aluminum ones with my MPPT solar controller to use it as a DC-DC charger and the '24V' output on that is all over the place depending on load, luckily it doesn't matter in that application.