Node 1 "Unity"
|DDCU-2||ZSR||ER-6 / Galley||MSRR-1||ER-1||ER-2||NOD2|
Node 2 "Harmony"
|P||TCS||MSS/AV RWS||ER-8||DDCU-1 / CEVIS||ER-7||Robonaut|
|D||ARS-1||LAB AV-1||RSR (CHeCS)||WORF||LAB AV-3||LAB AV-2|
|CBM||International Partner Payload||International Partner Stowage||NASA Payload||NASA Stowage||ROSCOSMOS Payload||ROSCOSMOS Stowage||Space Station Subsystems|
DC to DC Converter Unit No. 2 (SYSTEM)
DC-to-DC Converter Units are part of the station's Electrical Power System (EPS), converting energy from the Storage Subsystem (ESS) to a stable supply for user loads - such as lab equipment.
DDCU-2 is supplying NOD1, LAB, NOD2, NOD3, CUP and PMM with power (presumably).
The Electrical Power System (EPS)
The International Space Station relies on solar power to supply its systems with electrical energy. At maximum illumination, the Solar Array Wings (SAW) mounted on the Truss are able to supply energy at a voltage level of up to 173Vdc. Due to irregular illumination, however, this voltage may drop down to as low as 137Vdc (hence, the SAWs are mounted on two rotating joints - BGA and SARJ - tracking the sun). Power from the SAWs is routed to Battery Charge/Discharge Units (BCDU), which in turn are responsible for storing and retrieving said energy into and from nickel-hydrogen (NiH2) batteries.
The fluctuating primary supply voltage battery-side of the DDCU is later converted to a stable 124Vdc to power lab equipment and other user loads.
Furthermore, DDCU's may be used to adapt voltage levels between the Russian Segment (28Vdc) and the USOS (124Vdc), those units however are marked separately as ARCU/RACU (American to Russian / Russian to American Converter Unit).
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