From the manual for the 5A version, in PDF form
https://www.ebikes.ca/downloads/?file=Satiator_Manual
7.1.2 Mechanical
DC Output Connector 10A MULTICOMP/SINGATRON 2CT3002-W03400
DC Output Cable 1m with 3-Pin Neutrik XLR, (1=DC+, 2=DC-, 3=Signal)
A quick online search
https://uk.farnell.com/multicomp/2ct3002-w03400/plug-panel-10a-3-way-ip67/dp/1860686
Its PDF File - http://www.farnell.com/datasheets/2828108.pdf
Farnell also has warehouses/stores in the USA.
Which flavor do you want?
https://uk.farnell.com/w/c/cable-wire-cable-assemblies/cable-assemblies/circular-cable-assemblies?brand=multicomp&connector-type-a=circular-3-position-plug|circular-3-position-receptacle|circular-3-position-right-angle-plug|circular-3-position-right-angle-receptacle&sort=P_PRICE
Normal Style
https://uk.farnell.com/multicomp/2cm3004-w03600/cable-assy-skt-free-end-3way-1m/dp/1860751
https://uk.farnell.com/multicomp/2ct3004-w03400/cable-assy-skt-free-end-3way-1m/dp/1860700
90 degree style
https://uk.farnell.com/multicomp/2ct3010-w03400/cable-assy-skt-free-r-a-3way-1m/dp/1860711