Because the panel is not actually 5.55A 18V, you would never see 100W.
There’s two issues:
- the open circuit voltage x maximum current is not the deliverable Wattage
- imperfect conditions.
On a perfect day you’d see around 2/3rds of that, on a good day around half.
It is because the open circuit voltage is higher than the closed circuit. Open circuit is when no electrons are flowing, so they are accumulating and giving a higher voltage. Closed circuit is when the electrons can flow, that voltage is lower. As the electrons flow and as the panel is in heat, it’s voltage drops and current drops. So actual Wattage you’d measure in perfect conditions is around 2/3rds the open-voltage x max current.
So what Anker is probably (I’m guessing from their other products) doing here is simply multiplying the open voltage by the (closed voltage) initial cold condition amps. You would never see that into the Powerhouse. You would see the closed voltage normal (hot) conditions amps which is typically around 2/3rd the theoretical (impossible in reality) quoted max.
So in reality you’d not see 3 x 5.55A 16.65A , you’d see 10A.
Hence the 757 max 10A matches real world.
Is that not being truthful? It isn’t particularly Anker misrepresenting, they simply are multiplying the specs of the panels they are using which is higher than actual.
Search solar open voltage vs closed voltage and amps over time on solar panels.
Anker doesn’t quote the supplier of their panels so I can’t look that up but he’s an example of non-Anker product
So here if you were to multiply the open circuit voltage by the short circuit current you’d see 21.6x1.31 = 28W, but the actual deliverable peak is 17.2x1.16= 19.95. 19.95/28= 0.7 i.e. 70%
The open circuit higher voltage is important as that is the initial voltage the wires and electronics would see so you have to specify every component to that higher open circuit voltage. Further, in strong sunshine initially you’d get a the quoted short circuit current briefly. So for a fraction of a second you’d see in these panels 100W but would drop very quickly in perfect sun conditions to around 70W. 3 panels would be 3x70W = 210W (not 300W) and a current of around 11.6A.
So a 10A 727 limit is not really wasting anything.
Of course a benchmark from a reviewer with the appropriate equipment is the best way to know how everything would work together. Pending the product being in the hands of such a qualified person you have my best guess above, accepting I could be wrong and so will edit later if anyone can share better data.
Anker’s previous solar product benchmark to give some confidence the rough 2/3rds rule in perfect conditions or more commonly half the quoted max in typical conditions. You see a thorough (old benchmarks but the technology is the same now) https://blog.easyacc.com/2016/05/17/9-usb-solar-charger-test-of-anker-easyacc-aukey/