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)

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