All indication I've seen is to never exceed 30A with any MC4 connector at any voltage. This won't be an issue if you only use a single pair of Y connectors to connect two parallel strings. Once you get to 3 strings or more you use a combiner box where MC4 connectors of any kind are not used at all.Cool, thanks. One more question. If an MC4 Y connector is rated 30a 1000VDC does that mean you can't exceed 30a or you can exceed it at lower voltages?