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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Bypass power supply to plug on 12v


I would like to plug my mac on a 12V network on a boat.

I know how to create the voltage and current needed, but I don"t know what 's needed !?

To do so, I am desperately looking for the description of the PSU DC output strip, just like this example :

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PSU model found is 661-7512 or ADP 185 BFT

This way, i can just bring the needed voltage and current to each input pin of the motherboard and power the mac on.

Thank you in advance for your help!

(question 2: there are 3 strips : a DC output, a AC output, and a PSU command (ON/OFF) according to the PSU replacement guide of this website. ). What 's the AC output for ???) thx)


Update (09/30/2017)

Thank you for all your answers guys. I am still on preparing many other things for the trip, so i did not reply to you yet, but I well when i will get back to my mac topic. Anyway that page is on my bookmarks.


Answer this question I have this problem too

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Once you alter the system you won't be able to get anyone to fix it. Best to stick with the inverter & UPS setup. Generators are noisy and don't offer a clean enough voltage to go the direct DC route.


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just my two cents advise to get a inverter, best if UPS protected, if the voltage fluctuate it can cause damage to your imac.

directly connect to your imac is not a good idea imo.

While the generator is starting, the generator voltage and frequency are not stable.

it would be good to place a UPS between.


12V outlet >>> inverter >> ups >> imac

maybe someone has a better idea or product to help?

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Nothings impossible.... but APPLE-820-3588-A.pdf

iMac (Late 2013)

-iMac (21.5-inch, Late 2013)

21.5-inch display, 3.1GHz Intel Core i7, 16GB 1600MHz DDR3 SDRAM, 1TB Fusion Drive, NVIDIA GeForce GT 755M graphics

Power Consumption Thermal Output

Idle CPU Max Idle CPU Max

37W 136W 126 BTU/h 463 BTU/h

-iMac (21.5-inch, Late 2013)

21.5-inch display, 2.9GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, NVIDIA GeForce GT 750M graphics

Power Consumption Thermal Output

Idle CPU Max Idle CPU Max

37W 94W 127 BTU/h 322 BTU/h

-iMac (21.5-inch, Late 2013)

21.5-inch display, 2.7GHz Intel Core i5, 8GB 1600MHz DDR3 SDRAM, 1TB Serial ATA Hard Drive, Intel Iris Pro Graphics

Power Consumption Thermal Output

Idle CPU Max Idle CPU Max

38W 91W 129 BTU/h 311 BTU/h

Amazon-less than $20

Foval 150W Car Power Inverter DC 12V to 110V AC Converter with 3.1A Dual USB Charger

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I love a challenge however if you go this route you don't have to get into your iMac there's only two wires you have to hook up on the boat and that's the wire of your self a cigarette lighter style 12 plug-in (If one doesn't already exist). I would recommend purchasing a power inverter with ample wattage rating that is well above the rating for your iMac, Power inverters are cheap better to have too much tonight use it. I hope this gives you some options.

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How do I bypass my battery

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@josephjame82272 - iMac's don't have a battery for its main power.

How about creating a fresh question with your systems info and what you are attempting.


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julien will be eternally grateful.
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