Ukraine is making large-scale use of portable power stations such as Ecoflows. They offer fast AC charging, DC charging, rapid discharge, high-speed USB-C ports, built-in DC to AC inverters, and more.
However, most power stations only have a capacity of 1 or 2 kWh. That’s the major limitation: capacity.
You can increase capacity by buying larger models or brand-specific expansion batteries — but those solutions are expensive.

Eyes on Ukraine now has a solution.
We expand power stations using 5kWh server rack batteries & 5kWh golf cart batteries.

With a custom-built cable, or a ready made cable, these batteries connect directly to the internal battery of the power station, instantly expanding its capacity. Even better: charging the external battery is handled through the power station’s own charging system.

During a test, we managed to run a Bambu Lab P1S continuously for about 55 hours.

In this case we used a 1kWh Ecoflow Delta 2 + 5.1kWh Humsienk 100Ah Server Rack battery. Next week this set will be shipped to a command center in Ukraine.

All credit for the pioneering work goes to
@theresatrickforthat
@JOHNDANIEL1
@TheOldJarhead
on YouTube