Just a moment... Just a moment...
Something about Synqor was nagging at me as I wrote that. There is a problem. With things connected as recommended by Synqor (independent input filter for each brick, no sharing except at the converter outputs) the system will not start up reliably. When power is applied to the inputs of all of the filters, each of the filter outputs comes up at a slightly different time, which means that each of the brick outputs comes up at a slightly different time, which means that the first brick up sees the entire load, doesn't know there are other bricks coming along to share the load, and goes into overcurrent shutdown. Etc. The Synqor current sharing system is based on digital data transferred among the bricks and an arbitration algorithm to determine which is the master brick and which are the slaves. This works fine if the bricks all come up together - really together, as in all inputs hard wired together. With separate filters that is not the case, and the algorithm does not handle this well. As personality quirks go, this is a biggie.
DISCLAIMER: This next part is a story, ***not*** a recommendation.
Against Synqor's recommendations, our solution was to tie together the outputs of the filters to create a common DC input bus to the bricks. This 100% solved the problem, and we have not seen any filter failures related to this connection.
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