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MidNite's 1000-amp battery combiner box is excellent for larger off-grid systems (or grid-tied battery backup systems) where multiple inverters/charge controllers need to be combined into a single DC bus bar for connection to the battery bank.
This combiner box includes a 1000A positive and negative copper bus bar with ⅜" studs for attaching battery cable lugs (additional holes can be drilled for more connections; ⅜" stainless bolts are recommended to make these connections), and a 1000-amp / 100mv shunt with ½" bolt for making your inverter connection, meaning it is not for use with SMA inverters since SMA uses a 50mv shunt. The MNBCB 1000/50 has a 50mV shunt and works with SMA inverters.
Pictured here with a 3rd bus bar installed. 3rd bus bar is not included but is available separately.