One of the things I'm working on is a system that uses twelve
621.6Wh batteries.
That's a total of 7,459.2Wh.
I'm using an "ideal diode circuit" to safely treat this giant power supply as a single power supply.
*Of course, there are plenty of other protection circuits, monitoring functions, and safety devices as well.
The circuit bundles multiple batteries together to run the system for the maximum amount of time.
Apparently
you can buy it on Amazon.
You should be clear about what you want to do.
After all, your goal is to "drive both a mini PC and a display more cheaply, for longer periods of time, and within the limited case dimensions and weight," right?
If I were designing a system, I'd stuff as many Liitiokala battery packs as I could fit in my case, parallel them with an "ideal diode circuit", and use them to power a mini PC and display.
Of course, the display requires 5V, so you'll also need a
voltage converter.
You can also choose a battery with the capacity of
two or
three batteries without using an "ideal diode circuit."
The trade-off for freedom in battery placement would be simpler components.
-------------------------
If you know the power consumption of your system, you can calculate the battery capacity needed to run for n hours: x Wh.
It will become clear whether the battery capacity required for your system is realistic, or whether you will have to sacrifice battery life or size.
Only you can measure the power consumption (or current consumption) of your system.
I found
one that was almost identical to the one
I purchased.
You can measure the power consumption of a mini PC .
power bank =>
measuring instrument => Type-C to Type-C cable =>
PD trigger => mini PC
-------------------------
I have finally arrived at the actual products you refer to by "mini-pc", "RockPro RK3366", "RockPro", and "RockPro RK3399".
It's the
PINE64 "ROCKPro64", right?
After checking the specs and
circuit diagram, it appears that the normal current consumption is expected to be 1,110mA at 12V.
Also, the input voltage is listed as 12V, but it actually operates in the range of 6V to 18V.
*However, the withstand voltage of the capacitor on page 31 of the circuit diagram is 16V, so in practice the voltage is limited to around 6 to 14V.
When connecting a display using the eDP 30-pin connector, the power input voltage is applied directly.
According to the eDP standard, the range is around 5.5V to 21V, so this is probably not a problem.
The power supply circuit uses two ICs called
SY8113B, each generating a maximum of 5.1V 3A.
Looking at the efficiency characteristics at 5V output, we can see that the most efficient conversion is at an input of 6V.
However, we can also see that when outputting 3A, there is almost no difference whether the input voltage is 6V or 12V.
From this, we can see that if you want your battery to last longer, it is better to input a voltage closer to 6V.
However, if we assume that the maximum current consumption is 5V6A, we can see that as the input voltage approaches 5V, the current will approach 6A.
If the current is large, the wiring will heat up and loss will be large, so I think an input of 7V to 12V is appropriate.
Taking this into consideration, you can change the battery configuration.
The easiest thing to do is to replace the power bank with a
3S2P battery.
The capacity will be 81.6Wh, which is the equivalent of two power banks.
You can expect about 4-5 hours of operation for the display and RockPro64 combined.
But there is still space left.
You can also add a
3S1P battery that you already have.
It's easy to power the display with the 3S1P.
