I think some of you might be interested in knowing that I have devised with Amazon items a nice battery power combo, which works like a charm with a V 5.1 for full portability.
It features a generous 145 W powerbank with various wattage-amperage draws available, a quality 100 W 5.5x2.5 barrel connector to USB-C adapter, and an USB-C cable with robust 5 A/100 W PD specs.
It sustains easily my V5 operations, even with heavy multitimbral snapshots driven from a tablet computer or from the internal sequencer. My battery life estimate is about 1% or the power brick every 5-6 minutes of Zynthian usage at full CPU, so I guess that, depending on computational load of the loaded processors, this battery setup should afford at least 8 hours of continuous off-grid music making.
Gosh , running the V 5.1 Zynth on 5V would be notably underpowered, and arguably impossible.
The UGREEN powerbank is capable of delivering through USB-C up to 5A of current at 28V of voltage (140 W: 28 X 5), which is pretty robust for a portable battery.
I set up and tested this portable battery combo just this morning.
So, my figure estimates are at the moment purely speculative, being a projection of an approximate 5% energy consumption during about half an hour of sustained Zynthian usage, with various chains of synth processors playing sequenced stuff and a Midi keyboard connected.
During the next few days, I could leave the Zynth switched on with the powerbank connected, and see how long it holds.
Here’s a link to the USA Amazon site for the USB-C to 5.5x2.5mm Zynthian Barrel Adapter:
With the relevant items 2 & 3 from the Product Description:
Fast PD Charging: Support Type-C PD and QC2.0/QC3.0/USB PD,Build-in 100W DC20V 5A PD Emulator Trigger at type-c male end; Practical 100W Power Delivery,This adapter can support Max 100W 20V/5A Charging, It will supply USB-C power when your DC Laptop device is in use.
Input: Type-C, 100W Charger; Output: DC Male, DC20V 5A 100W Max.(Also support 65w and 18.5V-20.5V). In order to ensure 100W Power output, The charger and cable must use specifications of 100W or higher.
I honestly lack the Fernando’s electrical engineering expertise, but I also think that the not exactly cheap USB-C cord and connector ensemble manages to extract the relatively strong wattage and amperage from the powerbank .