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Compass Marine How To | all galleries >> Compass Marine How To Articles >> iPad Charging - How Much Energy? > Data Point 100% SOC @ 2:41 PM = -4.36 Ah's
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Data Point 100% SOC @ 2:41 PM = -4.36 Ahs

Data Point 100% SOC @ 2:41 PM = -4.36 Ah's

As in many other observations one can easily see how much more efficient it is to remain DC throughout the entire charging process.

To go from 0% SOC to 100% SOC using straight DC>DC, as opposed to DC>AC>DC we saved 1.28 Ah's of energy (5.64 Ah - 4.36Ah = 1.28)!!!

Put another way when using the 400W inverter and Apple 120V adapter to charge this iPad it uses 29% more energy to for a complete charge cycle.


Total Charge Duration = 4:41

Total Energy Consumed = -4.36 Ah

Average Current = 0.8A -1.1A

So what's the bottom line?

If you want to charge as efficiently as possible, stay with DC!

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Andrew cook 02-Mar-2014 22:44
As always, meticulous methodology applied to real world concerns. (It's not just boating dammit).
This is particularly rewarding since when we rewired (every inch except the engine harness) I decided to go 12v only on our 34' 1987 trawler.

Aboard at the dock 120v to charger, hot water, and 1 fwd tool outlet (unplugged when we are away). Of course no generator , we are cruisers not barbarians!

Thanks as always for your work. Andrew / Diligent