12 Volt bed outlet - what can it safely power?

[SafetyGuy]

Found this after reading post #74 which has diagram of wiring similar to residential L1+L2=120+120 for 240 circuit one leg being out of phase with the other. =

The 2022 Ford Maverick’s factory 400W system uses a modified sine wave, split-phase inverter topology that outputs two 60V AC legs relative to the chassis ground. However, because the vehicle isolates the electrical system from "true earth" ground, this configuration cannot safely or effectively be wired into a standard residential split-phase (240V) panel. [1, 2]

Understanding the Factory System

• How it works: The 400W system shares 400W of total output across the in-cabin and truck bed outlets. It outputs 2 × 60V AC legs out-of-phase, combining to provide 120V AC. [1, 2]
• Limitations: The factory 400 Watt inverter frequently faults if connected to high-draw appliances, medical devices, or large-motor tools. It is also unsuited for safely back-feeding a home's power grid. [1, 2, 3]

Yep, the information provided by @BlueSpec1 looked like it answered many of your questions!

I will still need to sit down and labour through it all at a snails pace.

Interesting info was that sitting with engine running, it provides 400 watts of power, but driving I think it only provides 300 watts...

So, in other news, I went out and plugged our Ecoflow Wave 2 Li powerpack into the Maverick 120 volt plug. The inverter in the truck appears to be a modified syne wave type inverter.

The Ecoflow did not seem to want to accept power from the truck on my quick test. Good news is that the DC charge cord plugged into the 12 volt power port worked great, and I had my Ecoflow set to allow only up to 8 amps of DC power to stay under limits of the truck aystem.

Interesting development, but more research to be done to confirm this as fact.

I added this, as the OP, @Yellowjacket is looking for what can be powered by the available power in the truck...so we have circled back in this thread, at long last.

Have a good one,

Andy

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[MakinDoForNow]

Yep, the information provided by @BlueSpec1 looked like it answered many of your questions!

I will still need to sit down and labour through it all at a snails pace.

Interesting info was that sitting with engine running, it provides 400 watts of power, but driving I think it only provides 300 watts...

So, in other news, I went out and plugged our Ecoflow Wave 2 Li powerpack into the Maverick 120 volt plug. The inverter in the truck appears to be a modified syne wave type inverter.

The Ecoflow did not seem to want to accept power from the truck on my quick test. Good news is that the DC charge cord plugged into the 12 volt power port worked great, and I had my Ecoflow set to allow only up to 8 amps of DC power to stay under limits of the truck aystem.

Interesting development, but more research to be done to confirm this as fact.

I added this, as the OP, @Yellowjacket is looking for what can be powered by the available power in the truck...so we have circled back in this thread, at long last.

Have a good one,

Andy

Note: I believe that the 20amp fuse runs the 300/400 watt inverter because the inverter is split phase with the AC legs being out of phase with each other and will share the same steady dc amps. Line 2 polarity is inverted resulting in the 60v of each line accumulating to yield the 120v. If it wasn't split phase then more dc fluctuating current would be needed for same wattage limit.
Also if your ecoflow will accept two dc inputs you can supply a second dc input through a second 20 amp fuze to increase its charge rate with 8 or (?) amps on each dc input. It has been posted the dcdc is rated at 265 amps continuous (300+ amps) and battery is fused at 200 amps. @Yellowjacket might check into using a split phase inverter for possibly using smaller wire size (note the 400 OEM inverter uses 18 ga wire shown in post #74.)

 

[2024ash]

After all this discussion, I checked again today. 2024 Lariat Hybrid. After turning off the vehicle, immediate loss of power to interior sources and Flexbed power outlets, regardless of whether there was a load present at shutoff or not. Voltage was reading 14.0-14.3v whether in accessory or start.

 

[SafetyGuy]

After all this discussion, I checked again today. 2024 Lariat Hybrid. After turning off the vehicle, immediate loss of power to interior sources and Flexbed power outlets, regardless of whether there was a load present at shutoff or not. Voltage was reading 14.0-14.3v whether in accessory or start.

Good day 2024ash

Thanks for confirming some of your info on your truck.

May I ask a bit more? Do you have a multi-meter (and comfortable using one) to check your 12 volt battery voltage once everything is shut down on your truck and the battery has had time to "relax"?

"Relaxed" is the term used when a battery has rested, with no loads for at least 2 or 3 hours.

This is when you get a true read on your 12 volt batteries resting charge...for example, my resting battery voltage on my 2025 Maverick Hybrid is usually over 12.82 volts in the morning after the truck being off for 12 or 15 hours.

To do this successfully the first time, pop your bonnet (only if you have a garage or a safe parking spot) when you shut off the truck. Even 2 or 3 hours later you should give you a good read, as the truck shuts off all background power usually in 70 to 90 minutes if all things are normal. If you do not pop your bonnet, doing it later will wake the truck up and give you an erroneous voltage reading when you take it.

If you have a multi-meter you lift the hood, and check to see your voltage on the boost points in the engine bay.

The reason I ask this is if your 12 volt battery is marginal, the truck will drop drop loads immediately upon truck shut down to preserve what charge your battery has left in it, to start the next time.

This voltage level will tell us a lot if your truck is different then mine, or if you have a chronically undercharged battery.

If you have provided this info, or I am repeating myself...sorry about that. I just got in and saw your post and wanted to respond before I forgot.

Thanks in advance, and have a good evening,

Andy

 

[2024ash]

Thanks Andy again for the explanation. I do not have a multimeter, I was using the built in voltage meter on Maverick Innovations USB outlet. Your explanation makes sense, and I believe this may be the original factory battery. The truck was built Jan 2024, with that in mind the battery could be coming up on three years of age.

I'll see if I can rustle up a multimeter.

Good day 2024ash

Thanks for confirming some of your info on your truck.

May I ask a bit more? Do you have a multi-meter (and comfortable using one) to check your 12 volt battery voltage once everything is shut down on your truck and the battery has had time to "relax"?

"Relaxed" is the term used when a battery has rested, with no loads for at least 2 or 3 hours.

This is when you get a true read on your 12 volt batteries resting charge...for example, my resting battery voltage on my 2025 Maverick Hybrid is usually over 12.82 volts in the morning after the truck being off for 12 or 15 hours.

To do this successfully the first time, pop your bonnet (only if you have a garage or a safe parking spot) when you shut off the truck. Even 2 or 3 hours later you should give you a good read, as the truck shuts off all background power usually in 70 to 90 minutes if all things are normal. If you do not pop your bonnet, doing it later will wake the truck up and give you an erroneous voltage reading when you take it.

If you have a multi-meter you lift the hood, and check to see your voltage on the boost points in the engine bay.

The reason I ask this is if your 12 volt battery is marginal, the truck will drop drop loads immediately upon truck shut down to preserve what charge your battery has left in it, to start the next time.

This voltage level will tell us a lot if your truck is different then mine, or if you have a chronically undercharged battery.

If you have provided this info, or I am repeating myself...sorry about that. I just got in and saw your post and wanted to respond before I forgot.

Thanks in advance, and have a good evening,

Andy

 

[SafetyGuy]

Thanks Andy again for the explanation. I do not have a multimeter, I was using the built in voltage meter on Maverick Innovations USB outlet. Your explanation makes sense, and I believe this may be the original factory battery. The truck was built Jan 2024, with that in mind the battery could be coming up on three years of age.

I'll see if I can rustle up a multimeter.

I have the rear outlets from @Maverick_Innovation_Designs 12volt power port and the voltage indicator and USB A/USB C ports in the back of my truck box....he has improved ones out now but I am very happy with the ones we ordered last year! Great quality.

I hope all goes well with your testing and look forward to your feedback.

Cheers,

Andy

 

[El Kabong]

I'll see if I can rustle up a multimeter.

For this kind of work (12v) even the cheapest ones from Wal-Mart or Harbor Freight or Amazon will do.

I have 5 or 6 of the things. I should get back into my electronics hobby....

 

[SafetyGuy]

Good day

I was thinking early this morning, about those who have reported in that their 12 volt power ports shut down immediately upon shutting their truck down.

The best way to check out each truck individually by the owner (as they may have depleted/degraded batteries) is to meter the 12 volt battery after it has been sitting for at least a couple hours and the battery is in its relaxed state, as all background electronics have shut down.

(This would require the engine hood being popped when you shut it down so you don't wake the truck up by having to open the door to get to the hood release.)

Here is a quick reference for AGM batteries

If someone doesn't have a multimeter or know how to use one, then it might work if they at least had have access to an appropriate smart charger for their type of 12 volt battery.

Charge the battery at the boost points in the engine bay, until the charger is done...then remove the charger, start the truck for a minute or two and then turn off the truck. Then check to see if the truck is still powering the 12 volt system...or not.

Just thinking of alternate ways to try and figure this out as I feel all our trucks should be the same in this regard...where we all should have powered 12 volt ports for a pre-determined time after using our trucks.

If this indeed works and power is now available at the 12 volt ports, then the owners should at the least start turning on their headlights or park lights whenever driving (to try and charge their battery more fully), and maybe want to look at their battery, to see if it needs replacing.

Just a thought,

Andy

(unless the battery is almost completely compromised, then meter it as described earlier would be needed)

 

[Maverick_Innovation_Designs]

I have the rear outlets from @Maverick_Innovation_Designs 12volt power port and the voltage indicator and USB A/USB C ports in the back of my truck box....he has improved ones out now but I am very happy with the ones we ordered last year! Great quality.

I hope all goes well with your testing and look forward to your feedback.

Cheers,

Andy

I just implemented an update to the mounting brackets to give them a smoother finish too.

In my experience with the truck, if the BCM believes that you're in a low battery state, it will shut off the power to the rear powerpoints immediately. This is different from the deep sleep which I believe is voltage dependent, this low battery state is state of charge dependent.

Typically I'm seeing that if my state of charge is below 50%, then the powerpoints will cut out as soon as the truck turns off.

 

[SafetyGuy]

I just implemented an update to the mounting brackets to give them a smoother finish too.

In my experience with the truck, if the BCM believes that you're in a low battery state, it will shut off the power to the rear powerpoints immediately. This is different from the deep sleep which I believe is voltage dependent, this low battery state is state of charge dependent.

Typically I'm seeing that if my state of charge is below 50%, then the powerpoints will cut out as soon as the truck turns off.

Good day

Thank you for the info as to your experience with the trucks electrical system.

By any chance, as it seems you have experienced varying low states of battery charge, have you tried Mavster Mechanics solution to keeping the 12 volt battery charged priperly?

It is where us hybrid owners turn on the park lights or headlights, thusly activating the truck to charge the 12 volt battery more fully/properly.

I know it works for me, and I have had absolutely no issues with any power ports drop off immediately at shut down.

There are others here who are experiencing it, so that is why I am asking you for your experience/thoughts.

Have a nice day,

Andy

 

[Glen Baker LLC]

At 300 watts this is close to max.

 

[710-oil-614]

Okay, I understand your point and you are correct, it isn't for anything heavy duty as noted.

That is why I suggested a lithium power pack (as you did, so we are thinking along the same lines).

I can only speak for the portable power packs we own, and in my limited knowledge but considerable investigation (now usage, as we love our 2 packs)...I found the ECOFLOW's to be very well designed and crafted.

I do believe the inverter in our Mavericks are good to a max of 400 watts...so when travelling and using a power pack, you can use far greater electrical loads...tested and confirmed by my wife and I, every time we travel. Just set the power pack to the max charge speed you want before plugging into your truck. And if you dial down the recharge speed it is better for the batteries as well.

Power packs, if good quality can really open up a lot of usable items when travelling as I noted in my previous post...and in a recent power outage we were running our full size home fridge with freezer until power came back on 2 hours later...the 2nd one was supporting our sump pump...and a 1/3 hp sump pump will last for many hours/ several days unless you have a river under your home.

We keep finding new jobs for our portable power packs, so I am very enthused when recommending Ecoflow products, like we have.

They are the perfect uninteruptible power source. Good ones pass through the power till the mains drop and then kick in in milliseconds.

I do hope this will be helping the OP and providing other ways to stay comfortable while on the road.

Have a good one,

Andy

Love the Ecoflow. I have a Bluetti AC180p which can do 1440wh capacity and I run it very much the same that you do. I use it on my road trip from Ohio to my property in Western NC to power my portable refrigerator.

Since my property does not currently have a structure or electricity I keep the Bluetti plugged in so it stays topped off but keeps the fridge running when I stop for gas or take a break.

When there I use 300w of solar panels to keep it charged - knowing if bad weather hits for multiple days I could use the Maverick to charge it back up if necessary which I have never had to do.

I run lights, fans, TVs, power computers, phones, my refrigerator, electric cooking equipment, etc.

Haven't yet worried about running out of juice.

 

[ripperAZ]

Nothing works like a Jackery. I want to keep a bunch of stuff charged and plugged in and even run an electric stove, and I’m not gonna risk the wiring in my truck for that Buy a nice Solar rechargeable power supply and you’ll be happy

 

[SafetyGuy]

Good day

Yes, our Power boxes are handy tools, just do your own due diligence in order to figure out what meets your needs.

I imagine the Bluetti and Jackery have the same app functionality where you can alleviate concerns of over-taxing the trucks wiring or asking for more power then the truck will allow (pop your fuse, etc).

I know I have my Ecoflow's set both to limit AC voltage it will demand...in my van I set it at 400 watts (3.4 volts at 120 volts) and DC voltage max demand from the truck or van is set at 8 amps DC.

Mine can utilize solar, AC and DC in order to charge, solar panel and power pack can be purchased as a pkg, making sure everyrhing is going to just work together, no muss or fuss. The Ecoflows come with all wires for charging with AC and DC.

I also used Consumer Reports as my starting point, first to see what types of power boxes are available, their positive and negative points...they all have pro's and con's.

It is a good idea to be aware of how these items are evaluated, in order to help figure out the best for your use as well as your what is the best you can get that fits your budget.

I prefer my Ecoflow Delta 3 over my Delta 2
..same capacity but the Delta 3 has a little better of a plug design, both on and out as well as the screen.

Delta 2's are currently discounted, if still available. The Delta 3 is just more user friendly.

Anyways, have a great day,

Andy

 

[SafetyGuy]

At 300 watts this is close to max.

Good day Glen

Yes, using the plugs from the truck only, you are severely limited in your options as to what you can use.

That is why I recommend my Ecoflow...let the power box do the hard work, and control the amount of electricity demanded from the truck so as not to pop fuses, etc.

Here is the box my Delta 2 came in, good comparative info. Same info as my Delta 3.

Andy

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