[Georges V]

2 BiBi Yannouuu			0

L'omnicharge est déjà vendu, et il est déçevant. Je détaille dès que j'ai une minute.

Je ne retrouve plus la critique à l'égard de l'omnicharge (vendu sur kickstarter et désormais écoulé sur indiegogo, mais disparu d'amazon), mais la teneur était similaire aux faiblesses des produits ChargeTech :

What’s the big deal? EFFICIENCY. Consider what’s happening here. You’re taking 16.8VDC, boosting it to 59V by pulling in a LOT of current from the batteries, then by using 2 FET’s, you cycle one FET to throw the voltage UP, and cycle the other FET to throw the voltage DOWN 60 times a second, effectively creating 118 volts of “fake” alternating current (AC). Then that “fake” AC travels to your laptop adapter where it immediately gets converted back down to DC voltage to power your laptop. This is a VERY inefficient process… You’re essentially paying a large toll just for the ability to use the AC plug, and the missing parts of the sine wave are murdering your power conversion efficiency.


The amount of power lost by using a modified sine wave instead of a “real” sine wave is obscene, and reduces the useful utility of this pack a massive amount. For example, an 85W AC load on the pack only generates 48.1W of DC through a 24VDC class 5 laptop adapter, and that equates to an efficiency of only 56%, which further equates to a power waste of 37.8W. That’s terrible. A few more mosfets and design changes to use a real sine wave and this thing would have been so much more performant. Unfortunately, Samyatech cheaped-out in the inverter design, and it really shows in terms of lost efficiency. Here’s some interesting math to go along with this:

Suite et source : https://www.amazon.com/review/R1EA3O7ZDL...2335752011