Easy Plug And Play 12V DC Power Supply For Starlink Roam

Starlink officially launched their Mobile (also called Roam) service tier way back in May of 2022, but the lack of official accessories made for RV’s continues to baffle me and many of my readers. The most requested accessory for Starlink Roam is a 12V DC power supply. So far, Starlink hasn’t delivered in that area. Thankfully, 3rd party companies have answered the call, and there are several ways to create your own Starlink DC power supply.

With a few supplies, and basic electrical skills, you can build your own DC power supply for Starlink. It can be powered by your existing 12V, 24V, or 48V power system. If you don’t want to deal with inverters, and wish to run Starlink directly from your battery system, this is the guide for you.

In this tutorial, I will show you two popular methods to build a 12V DC power supply for the Standard (rectangular) Starlink dish. I will first explain why you would even want one. Then I will talk about all the supplies needed for this project. Finally, I’ll walk you through the process step by step.

Warning: Use this guide at your own risk. Electricity can be dangerous if proper safety precautions aren't followed. Modifying any of the Starlink hardware will void your warranty.

Why DC Power?

RV’s, vans, overlanding rigs, and even off-grid cabins use batteries for electricity. Efficiency is extremely important to maximize the amount of energy available. The Starlink router doubles as a power supply for the dish. It converts AC power from the wall plug into usable 48V DC power for the dish.

That’s fine for residential applications, where you are connected to the grid and have AC power readily available. But with an off-grid battery system, you need an inverter to get AC power. So you would be going from DC to AC, and then back to DC in the router. That extra conversion to AC creates an efficiency issue, and wastes precious energy.

Two Methods To Build A DC Power Supply

This guide is on its second version. When I first wrote it, Yaosheng wasn’t making their Starlink cable adapter or POE injector. If you wanted to build a DC power supply for Starlink, you had to be comfortable cutting the cable in order to install an RJ45 connector.

Now, building a 12V power supply for Starlink Roam is a lot easier. Using a special adapter, you can avoid cutting the Starlink cable. No more worrying about wiring pinouts or damaging your hardware. It’s virtually plug and play these days.

So, just pick one method below to see how I built my own DC power supply:

Method 1 – The Easy Way – This method doesn’t require any modifications to the Starlink equipment. No cable cutting, no RJ45 connectors. This method is more expensive, and recommended for people without electrical skills.

Method 2 – The Cheap Way – This is the older method, which involves modifying the Starlink cable with an RJ45 connector. This way is much cheaper, but involves more electrical work.

Method 1 – The Easy Way

If you want a plug and play DC power supply for Starlink, the easy way that follows is for you. With just a few components, you can run the Standard Starlink dish from your RV/van/off-grid battery system.

Supplies Needed

Note: This article may contain affiliate links for the products mentioned
uxcell New Big-Size Waterproof DC 12V Step-Up to DC 48V 8A 384W Car Power Supply Module Voltage Booster Converter Regulator

48V DC-DC Converter – #CommissionsEarned

YAOSHENG Rectangular Dishy Cable Adapter to RJ45. Connect Your Dishy V2 to PoE Injector Quickly and Easily.

Yaosheng Dishy Cable Adapter – #CommissionsEarned

YAOSHENG 150W GigE Passive PoE Injector with Surge Protection,Developed for Dishy V2 pinout. 48-57V / 3A / 150W,Silver

Yaosheng POE Injector – #CommissionsEarned

  • 48V DC to DC converter – This DC/DC power supply takes either 12V or 24V from your battery and converts it to the 48V required to power the Starlink dish. If your battery system is already 48V, you can skip this.
  • Yaosheng Dishy Cable Adapter – This adapter accepts the Starlink cable on one end, and has an RJ45 connector on the other end. This is the key component that lets us avoid cutting the Starlink cable.
  • Yaosheng Passive POE injector – A POE (power over Ethernet) injector takes the 48V from the DC power supply and sends it to the Starlink dish. It has 2 Ethernet ports, one for the dish, and one for the Wifi router.
  • Wifi router – You can’t use the Starlink router with this method, so you’ll need an aftermarket router. Almost any of them will do, but make sure it uses 12V like the one I linked, so it can be hooked up to your battery.
  • Screwdriver – You will need a small screwdriver to connect the power supply leads to the POE injector.
  • Crimp/splice connectors – For connecting your power supply wiring to your battery system.
  • Crimp tool – To crimp the electrical connectors, some pliers would also work.
  • Ethernet cable – You will need a Ethernet patch cable to go from your router to the POE injector. Usually the aftermarket router will come with one.

Step 1 – Mount The Components

In order to mount all the various components in my RV, I just screwed everything to a scrap piece of wood that I had laying around. You can be as creative as you wish here. Personally, I just needed something clean and functional.

There are a few considerations to think about when laying out your components. The Yaosheng adapter and POE injector are connected with the included Ethernet cable. You’ll want to align the components so that the connectors are easily accessible. As you can see in the photo above, I oriented the adapter and POE injector so that the POE ports faced each other.

Also, keep in mind that the output leads from the power supply need to be routed into the POE injector. I avoided having to splice in additional wire by installing the POE injector close to the power supply.

Finally, think about how your enclosure will mount in your RV/van/cabin/etc. The Starlink cable comes out of one end of the cable adapter. You also have the router Ethernet cable coming out of the POE injector. Lastly, you will have the power supply input leads going to your battery system. Figure out the best way to lay out the components so that you can easily route all the cables, and access the connectors in the future if needed.

Step 2 – Connect The Components

After you’ve assembled all the components, it’s time to hook everything up. Without any DC power applied to the power supply, make the following connections:

  • Power supply 12V output to POE injector input – Connect the white (+) wire from the power supply to the positive (+) terminal of the POE injector. Connect the black (-) wire from the power supply to the negative (-) terminal of the POE injector.
  • Cable adapter to POE injector – Use the shielded Ethernet cable included with the Yaosheng cable adapter to connect the adapter to the “POE” port on the POE injector.
  • Starlink to cable adapter – Connect the Starlink cable to the Yaosheng cable adapter.
  • Router to POE injector – Connect the router Internet/WAN port to the POE injector “Data” port using an Ethernet cable.

Step 3 – Create The Router Power Supply Cable

Before you modify the router power supply cable, it’s a good idea to go through the router setup and configuration. It’s just easier to do this now rather than worrying about it later. The specifics will depend on your router model, but follow the manufacturer instructions for how to perform the initial setup. You should set up a Wifi name and password on your router before continuing, so that when it comes time to test your power supply, you can connect and test it right away.

Most household routers plug into the wall socket with a power adapter. The output of the power adapter is usually 12V DC. If you purchased the TP-Link router I linked above, all you need to do is cut off the AC-DC converter, and wire the 12V DC plug to your RV/van/etc. battery system.

For the TP-Link router power supply, the black lead with the white strips is positive (+) and the plain black lead is negative (-). If you are using a different router, double check the specifications to be sure it can be wired up to a 12V source. Be sure to also check the polarity of the power plug leads.

Step 4 – Plug Everything In

Now it’s time to make the final power connections and install the power supply in your RV/van/cabin/etc. Supply 12V/24V DC to the input leads of the DC to DC power supply. Connect the positive (+) battery lead to the red (+) input wire from the power supply. Connect the negative (-) battery lead to the black (-) input wire from the power supply. It’s best practice to place a fuse on the positive (+) lead going into the power supply.

Supply 12V DC to the router power supply (if using the TP-Link router mentioned in the supplies list). Again, it’s best practice to install a fuse on the positive (+) power leads. Typically, you are going to tap into your RV/van fuse block for 12V power, which satisfies the fuse requirement. But if you are doing something else, be sure to follow best practices.

At this point, the power supply is ready to test. If you decided to build the power supply “the easy way”, go ahead and skip down to the testing section.

Method 2 – The Cheap Way

When I first wrote this article, the Yaosheng adapter didn’t exist. The only way to build a DC power supply was to cut the Starlink cable in order to install an RJ45 connector. The RJ45 connector was necessary to be able to plug into the POE injector.

The cheap method involves more work, but the tradeoff is huge cost savings. The Yaosheng POE injector and cable adapter combo is about 7 times more expensive than the POE injector used for the cheap method. If you’re comfortable cutting the Starlink cable and installing RJ45 connectors, you can save a lot of money by building this version of Starlink DC power supply.

Cheap Method Video Tutorial

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The video is also available on our YouTube channel if you prefer to watch there.

Supplies Needed

uxcell New Big-Size Waterproof DC 12V Step-Up to DC 48V 8A 384W Car Power Supply Module Voltage Booster Converter Regulator

48V DC-DC Converter – #CommissionsEarned

Tycon Systems POE-INJ-1000-WT High PoE 4 Pair Injector

POE Injector – #CommissionsEarned

Sabra Technologies Shielded rj45 cat6 cat 6a connectors Gold Plated Cat6 Pass Through Connectors 23awg Cat6 Shielded Cat6/Cat6a Modular Plugs Ethernet Ends (60 PCS)

Shielded RJ45 Connectors – #CommissionsEarned

Before you can get started, you need several supplies to create the DC power supply:

  • Starlink Ethernet Adapter – In this tutorial I am modifying a Starlink Ethernet Adapter instead of modifying the Starlink cable directly. I prefer this method because I can easily move my dish back to my home and plug it right into the Starlink router. If you prefer, you can skip the Ethernet Adapter and just modify the Starlink cable instead.
  • 48V DC to DC converter – This DC/DC power supply takes either 12V or 24V from your battery and converts it to the 48V required to power the Starlink dish. If your battery system is already 48V, you can skip this.
  • POE injector – A POE (power over Ethernet) injector takes the 48V from the DC power supply and sends it to the Starlink dish. It has 2 Ethernet ports, one for the dish, and one for the Wifi router.
  • Wifi router – You can’t use the Starlink router with this method, so you’ll need an aftermarket router. Almost any of them will do, but make sure it uses 12V like the one I linked, so it can be hooked up to your battery.
  • Wire cutters/strippers – You need something to cut the Starlink cable and to strip back the wire on the PoE injector/power supply
  • Screwdriver – A small flat head, eyeglasses screwdriver would work fine
  • Crimp/splice connectors – For the battery, DC/DC converter, and POE injector wiring
  • Crimp tool – To crimp the electrical connectors, some pliers would work
  • RJ45 crimp tool – We will be installing our own RJ45 connectors, so you will need a tool that can crimp them on the cable.
  • RJ45 shielded connectors – We’ll be replacing the proprietary Starlink connector with a shielded RJ45
  • Ethernet cable – You will need a Ethernet patch cable to go from your router to the POE injector. Usually the aftermarket router will come with one. We will be modifying one end of the Ethernet cable.

Step 1 – Modify The Starlink Ethernet Adapter

The first thing we need to do is replace the proprietary Starlink connector on the Ethernet Adapter with a shielded RJ45 connector. This will allow the dish to be powered by our own power supply, instead of the Starlink router. If you have opted to skip the Ethernet Adapter and modify the Starlink cable directly, the steps are the same. I’m modifying the Ethernet Adapter so I don’t have to cut into my Starlink cable, but it works fine either way.

Converting To Starlink POE

There is one caveat, though. The POE (power over Ethernet) pinout used by Starlink is different than the standard POE pinout. To solve this problem, we just need to wire our RJ45 connectors a bit differently from the T-568B standard normally used when terminating RJ45 connectors. Here is the pinout that you need to use for the shielded RJ45 connector on the Starlink Ethernet Adapter (or Starlink cable):

Prepare The Cable

Use wire cutters to cut the Starlink router connector off the Ethernet Adapter (or Starlink cable). Then, strip off about an 2 inches of insulation to expose the conductors and shielding. Most crimp tools have a wire stripper blade just for this job. Peel back the shielding foil and fold it back down the cable, we will deal with that later. Also find the drain wire. It’s the bare conductor. Fold that back out of the way for now. You should now be left with 8 twisted pairs, 16 wires total. 4 of the pairs are larger gauge wire, the other 4 are smaller in size. Trim back the smaller pairs, we won’t be needing them.

Untwist all 4 pairs and do your best to straighten out each of the 8 wires. Once they are straightened out, hold the cable in your left hand, with the wires pointing across your body to the right. Arrange the wires according to the pinout above. When they are in the correct order, do your best to flatten and straighten them out, using your left thumb and index finger to hold them flat, tight together, and in the correct order.

Install The RJ45 Connector

Keep holding the wires with your left thumb and index finger. With all 8 conductors in the correct order, flat, and straightened out, make a flush cut across all the wires with wire cutters, taking off about a half inch. With a clean, straight end, now take your RJ45 connector and insert it onto the wires. Tab side down! After you do this, triple check that the wires are still in the correct order. As you hold the cable in your left hand, the order from top to bottom should be: White/Orange, Orange, Blue, White/Green, Green, White/Blue, White/Brown, Brown.

The foil and drain wire should be folded back along the cable at this point. Slide the RJ45 connector back so that as much of the cable jacket, foil, and drain wire are inserted into the connector as possible. Then, use your crimp tool to crimp down on the RJ45 connector to terminate the cable. Trim off any excess wire that remains. Also trim off any foil and drain wire that extends out past the connector.

Step 2 – Build The Power Supply

Mounting Method

In this tutorial, I’m just building the power supply by screwing the components to a scrap piece of wood. For your own power supply, get creative if you want. I’m just using wood screws to secure the POE injector and DC-DC converter to the wood. Eventually, I’ll mount this in my RV in a utility cabinet.

Assemble The Components

First, take a look at the DC-DC power converter wires. They should be labeled for voltage in and voltage out. The voltage input wires, red (positive) and black (negative), will hook to your battery system. We can set these wires aside for this tutorial. Identify the voltage output wires. White for positive, black for negative.

Route the voltage output wires into the DC input of the POE injector, making sure to match white to positive, and black to negative. You may need to strip about 1/4 inch of insulation off the wire if it doesn’t already come stripped. Use a screwdriver to secure the exposed part of the wire into the terminal, double checking that you have the correct polarity.

At this point, the power supply part of this project is complete. Like I mentioned before, the two other wires on the DC-DC converter connect to your battery system. How that looks depends on your individual application, so you’ll need to figure out the best way to supply DC voltage from your battery to your Starlink DC power supply. In my case, I have a fuse block in my RV with an unused slot. I ran some wire from the fuse block to where my power supply will mounted. Then, I connected the wires with butt splices. I went ahead and removed the fuse beforehand, so that power is not being applied to my project until I’m ready to test.

Remember, practice electrical safety! Don't hook up to your battery until you are ready to test! Please consult an electrician if you are not comfortable and knowledgeable working with your RV/cabin/van/etc. electrical system. 

Step 3 – Modify The Router Cables

Before we begin to modify any of the router cables, it’s a good idea to go through the router setup and configuration. It’s just easier to do this now rather than worrying about it later. The specifics will depend on your router model, but follow the manufacturer instructions for how to perform the initial setup. You should set up a Wifi name and password on your router before continuing, so that when it comes time to test your power supply, you can connect and test it right away.

Router Ethernet Cable

Next we need to reconfigure one end of an Ethernet cable. This cable will be what we plug our router into the POE injector with. Remember how I said the Starlink POE pinout is different? Since we had to modify the dish side of the connector, we also need to modify the router side connector to match. We only have to modify the end that plugs into the POE injector, not both ends. Your aftermarket router probably came with an Ethernet cable that you can use. Otherwise, you can find a 6ft, 12ft, etc. Ethernet cable at any electronics or home store.

Repeat the process that we used in Step 1 on just one end of the Ethernet cable. The pinout will be the same. The Ethernet cable won’t be shielded, so it won’t have the foil or the drain line conductor. But you can still use the shielded RJ45 connectors, no worries there. The modified RJ45 connector end of the Ethernet cable plugs into the POE injector. The other end of the Ethernet cable plugs into the Wifi router.

Router Power Supply

Most Wifi routers, including the one example in the supplies list in this article, run off DC. The power cord has an AC to DC converter built into the part that plugs into the wall. If you are using a different router, it might have a power brick that sits in between the wall plug and the router. Since we want the router to be powered only by DC, we can simply cut the wire after the power brick, so that we can utilize the same DC power connector that comes with the router.

For the TP-Link router I’m using, the wire with the white strip is positive, and the one without is negative. Verify the polarity for your router if you are using a different one. Connecting to a DC power source with the wires reversed can result in damage to the router!

Now we just need to connect the 12V battery system to the power wire from router. In my case, I ran a wire from my RV fuse block to the router location. That gives me 12V DC power, and I just connected the wires with butt splices. I’m mounting my router in the same location as my power supply, so routing the Ethernet cable that connects the router to the POE injector isn’t difficult. If you are going to mount the router in a different location, you will need to plan how to route the Ethernet cable back to your new Starlink DC power supply.

Step 4 – Plug Everything In

At this point in the process, all of the following should be completed:

  • An RJ45 connector has replaced the Starlink connector on the Ethernet Adapter (or Starlink cable)
  • The output from the DC-DC converter has been connected to the input of the POE injector
  • The Ethernet cable from the router to the POE injector has a new RJ45 connector on one end that is using the modified pinout shown in the previous section
  • The router power supply has been modified to wire into the battery system of your application

Apply Battery Power

If all of the above is done, now we can test it out! Apply battery power to the input of the DC-DC converter, in whatever way you have decided to hook it up. In my case, I just need to reinsert the fuse on my RV fuse block to apply power to my Starlink DC power supply.

Connect The Dish And Ethernet Adapter

If you are using the Ethernet Adapter in this tutorial, plug the Starlink dish cable into the Ethernet Adapter. Then, plug in the modified RJ45 connector on your Starlink Ethernet Adapter (or Starlink cable) to the power POE port on the POE injector.

Plug In The Router

Next, make the connections on the router. There should be an Ethernet cable connecting from the data port on the POE injector to the WAN or Internet port on the router. Also, plug in the router power supply to DC power. Verify that the router turns on. If you didn’t already go through the router setup before, now is a good time to do it. You’ll have to reference the instructions for your particular router.

Test The DC Power Supply

Whether you chose the easy way or the cheap way, your power supply should be built at this point. Everything should be hooked up and ready to test.

Set up your Starlink dish nearby with a clear view of the sky. The first thing to check is your aftermarket router. Make sure it’s powered on and broadcasting a Wifi signal. Grab your phone and connect to the Wifi network of your router.

Check to make sure that the Starlink dish is powered on. There are no LED’s or indicators, but the dish should move itself into a vertical position within a several minutes of power being applied to the Starlink cable. It searches for satellites in the vertical position, and then it will aim itself in its ideal direction. You can verify the dish is on by opening the Starlink app on your phone (your phone needs to be connected to the router Wifi network). Alternatively, you can use an internet browser on a device connected to your Wifi network and browse to http://dishy.starlink.com/

It may take up to 10-15 minutes for the dish to boot up and become available to view on the app or website. The app will let you know if the dish is working or not. If you have an active subscription, the status should change to Online after several minutes of booting up and searching for satellites. Check for internet connectivity by performing a speed test. Speeds with this setup should be similar to what you get with a normal setup.

I was able to connect using my TP-Link router right away. If the Starlink app keeps saying Disconnected, even though your setup is working with internet, you might need to create a static route to the dish.

The Results

I tested my new Starlink 12V DC power supply for about an hour to verify that it stayed connected to the internet. I performed several speed tests, watched a video, and checked email. I kept an eye on my battery monitor (I’m using the EcoFlow River 2 portable power station) throughout the testing to check power usage.

As you can see from the screenshot above, the power supply was drawing around 40 watts while streaming a 1080p YouTube video. The 40 watts includes the power needed for the dish, as well as the Wifi router.

Now take a look at how much power the same Starlink dish uses when plugged into AC power via the Starlink router. I streamed the same 1080p YouTube video for this test as well, so that the comparison was as fair as possible.

I consistently saw about 45-50 watts when streaming the YouTube video on AC power. This wasn’t a scientific test, but I think it’s safe to say I saw a roughly 15% reduction in power when using DC power, compared to using the Starlink router and AC power.

Saving 7 watts might not seem like a big deal. For people connected to the grid, it really isn’t much. But for those of us trying to use Starlink off-grid, 7 watts is pretty significant when you think about hours and hours of use each day. Even if I were to be conservative, and call it a 10% improvement by powering Starlink from DC, I call that a success.

Final Thoughts

This isn’t the easiest project to do, especially if you chose the cheaper method involving cutting the Starlink cable. If you decide to tackle this yourself, I hope you find this guide helpful. As you found out by reading, I was able to improve my energy usage by about 15% by building my own DC power supply to run off 12V.

Just make sure to exercise caution when working with electricity. And also keep in mind that modifying how your dish is powered can result in damage that won’t be covered under your warranty. With all that said, let me know if you have any feedback or questions in the comments below!

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178 thoughts on “Easy Plug And Play 12V DC Power Supply For Starlink Roam”

  1. Outstanding how-to on DC conversion. Found your site searching for RV use, getting ready to opt for the service.
    I already have a Xantrex pure-sine inverter in my RV, and LFP battery with 600W of solar, so I may just try running it on that and see how it does. If it’s a power hog will surely be looking to convert it.
    Thank you for your contribution to the technology – you have better information on the service than they do. 😉

    Reply
    • Thank you, I appreciate the feedback! Still waiting for a new product to use on the Gen 3 version of this guide. If you are in the US, that’s the model you will be getting. I hear it’s a bit more efficient in terms of the AC-DC conversion, so I’m confident that running it on the inverter will work fine for now. I’m interested to see how much I can gain in terms of efficiency when I build the DC power supply for it.

      Reply
      • I just bought the Gen 3 system and want to do a 12v conversion for my RV. I’m wondering if the 48v converter/power booster will work for this system or if I need something like a 12v-56v c/pb as hinted at in a few other posts. Do you know?

        Reply
  2. This is a great project, for a Gen 2 system it seems. Now that the Gen 3 are the default system, is the adaptation to a 12V power source easier? Looks like it would be just a matter of a DC-DC 12-48V block with cable and correct connector to fit the power input on the Starlink router. Is the connector a proprietory part, or is it a standard connector?

    Reply
    • The conversion should be easier, but the tough part is finding a decent 12-56V step up converter. The Gen 3 dish runs on 57VDC. The connector on Gen 3 is Standard RJ45, meaning the dish can plug right into a POE supply, no adapter or splicing needed.

      Reply
  3. I have a modified version of your simple setup on my boat, and we lost power last night and I think there was a power surge when the batteries took over the load from the AC battery charger (or vice versa), as we had a blown 5amp fuse in the morning and no internet. Question is, should I be using a bigger fuse? I put a 30AMP one back, but wonder if this isn’t a potentially bigger issue.

    Reply
    • I recommend a 10A fuse for the 12V supply. The Gen 2 dish can draw up to around 100 watts during startup, or when heating mode is on auto or pre-heat. At 12V, a 5A fuse only allows up to about 60 watts of power draw before the fuse blows. 60 watts is plenty most of the time, but under some conditions, Gen 2 will use more than that.

      Reply
  4. Thanks for the excellent write-up. I’m on a sailboat, and want to use a Victron 12v-48v converter (to integrate with the other Victron equipment we already use). So in terms of sizing the 12v-48v converter, how many watts does your set-up require, if you know? The Uxcell DC 12V Step-Up to DC 48V Car Power Supply you linked to is rated for 384 watts, just wondering if I would need that much capacity….

    Reply
    • The Gen 2 dish uses up to about 100 watts. If you use a quality DC converter, like the Victron, size it based on 100 watts. If they have 125 or 150 watts as an option, that gives you some wiggle room in case the dish has any spikes.

      Reply
  5. Great write up! Sorry if this has been mentioned somewhere already in the comments, but does this work for the flat high performance dishys as well? Has anyone tested this type of set up in remote or marine environments? We are putting one of these dishys out in the middle of the ocean and want to minimize power draw without sacrificing satellite connectivity?

    Reply
    • To my knowledge, nobody has done the Flat High Performance version and shared it online. My guess is that people avoid the FHP dish because it uses nearly triple the power on the Standard Actuated Gen 2 dish. People interesting in saving every watt will not pick the FHP to begin with.

      Reply

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