USB-C charging

@Kieran_Levin and what counts as low? 45W?

I know this is a little off topic (but there are a few messages in this thread so I’ll throw in my two cents), I’ll give my experience with Norton Crypto FYI. I’m running it on a new server I built six months ago (Intel(R) Core™ i7-10700K CPU @ 3.80GHz 3.79 GHz, 32GB RAM installed, NVIDIA GeForce RTX 3070 GPU ). Initially, the miner ran great in the background but the server bricked when even lightly loaded. This improved after upgrading the graphics drivers. Now my server doubles as a heater (!) and I’m keeping my window cracked even in -18C (0F) outside weather, and half of the profits go back to pay for the electricity so the system is net profit positive, but not terribly environmentally sensitive, and Norton taking a 15% cut is pure villainy. Then, there’s the wear and tear on the $1000 GPU, which I can’t quantify at present. I suspect Norton Crypto will go away when Proof of Stake hits when the beacon chain merges into the Ether mainnet (The Merge |

@Shawn_Lewis I would not recommend a power supply below 60W if not running with a battery, remember PL2 can allow the cpu to go well above 28W for seconds at a time. Plus there are plenty of things outside the CPU package consuming power, such as the NVME drive, which some models can burst to several W.

If you have 4 power hungry usb-c devices plugged in, they can consume a max of 37.5W as well.

Plus there is some regulator loss.

So depending on what you are doing, and what is plugged in I would recommend 60W to 100W.

To clarify @Sean_Greenslade post. The framework laptop supports power input of up to 20V-5A, not 3A. So the mainboard design can make use of 100W power supplies.


Thanks for the clarification, that’s good to know.

Just want to make sure of something. Assuming I were to use at least the 60W version, would I be able to charge the laptop with an apple magsafe charger, if i were able to appropriately connect the magsafe receiver to the USB-C connector? or is the compatibility only for USB PD chargers that accommodate 60W-100W? If possible I’d like to try and design an expansion card that will use the mag safe, and control the LED

I see a potential issue with this. The 60 W adapter only supplies 16.5 VDC, so it would only work with the 15 V PD level. But as it was discovered in this thread, some Framwork laptops cannot be powered from 15 V. According to Wikipedia, only the very newest 85 W MBP Retina adapters support 20 V. Assuming you want to support the earlier adapters, you might be able to stuff a very efficient buck converter into an expansion card and use the 12 V PD level. That would limit you to 60 W (12 V @ 5 A).

The 1-wire protocol to query the adapter type and set the LED shouldn’t be too difficult. There seem to be some details here.

Your circuit would also need to present the 5 V rail to the USB port during the negotiation, though the magsafe adapters supply a ~6.8 V standby rail, so that should be easy enough.

And finally, you’ll need a microcontroller to manage polling the magsafe parameters and converting them into USB-PD negotiations with the computer.

It seems doable, though definitely an intermediate to advanced-level project.

@Patrick_Shannon you are probably better off just getting hold of the magnetic tip USB-C charging cables and printing an Expansion Card to hold the receptacle semi-permanently…Which I believe has already been done and of course has native support.

@Sean_Greenslade Thanks for the detailed reply. and @andyk2 I agree this would be cumbersome to say the least, and in all likelihood I will end up using the USB-C magnetic connector options that are more readily available in the short term. But never-the-less find the idea of having my apple accessories be compatible with 3rd party products too tantalizing not to at least consider

Hey, @Shawn_Lewis, I’m having a tricky conundrum. The top-tier PC is charging just fine from my 60W charger. Even when my machine is fully loaded it’s only pulling around 45W. I want to charge my SuperTank battery from a second USB-C PD port, but I can’t get much more than 0.6W out to the external battery. Shouldn’t I be able to get at least 15w more out of the charger and into the external battery ? When I connect the charger directly to the SuperTank it pulls close to 50W, but even 15W would be enough to charge it overnight.

@Myles_Dear try charging the bank from the port on the opposite side, leaving the framework charger plugged into the port on the left side.

Thanks, @Shawn_Lewis, that worked! I’m getting 13.3W out to the external battery when I switch sides and have incoming / outgoing USB-C connections on different sides.

I wouldn’t have thought to go there, thanks for the tip.

@Myles_Dear, You’re welcome. The ports are paired on the left and on the right. There are 2 thunderbolt controllers and 1 usb4 controller. When in doubt use the pair on the opposite side.

Regarding a fixed USB-C port… I really would like to have a changable one. That is the reason why i looked for the framework laptop. I have two very active kids and 3 laptops with failed power supply in the last 18 month.

That changeable power adapter would be the reason for me to buy one - but the small size and the glare display is something which I would not buy. So hoping for my standard 17" display in a future generation.

So I need to order one USB-C for charging or else I wont be able to charge it.

Side question, safety wise I am very addicted to my macbook magsafe power connector. (dogs running around and stuff.) wil there be a sort of DIY expansion card available in the future so I can mod the expansion cartrage with a magsafe connector (availible at ali I think) instread of the USB-C?


@Sean_Greenslade is it still the case that the laptop won’t draw more than 60W? With windows 11 running and charge under 40%, my laptop pulls nearly 100W. Do you have documentation to support this?

@sgt_rjp No, I was mistaken. As reported here, the USB-C ports and power input circuitry are capable of accepting up to 5 A at 20 V, allowing a maximum of 100 W of input (assuming your USB-C charger supports that voltage and current).

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Instructions unclear, have 10 potatoes in parallel…


Amazingly informative thread on USB-C charging.
Thanks everyone for sharing your experiences using external battery banks. I am getting on a 9 hour flight this week. Just purchased this beastie My average usage seems to last 4hours or thereabouts. On flight without wifi/BT and probably much lower brightness, should last longer on its own. Let’s see.
Will report back on how good/bad/ugly it is. Was split between this unknown brand vs a 60W Anker PowerCore III. Went with the promise of PD100. :crossed_fingers:t4:

I thought aircraft provide USB charging ??