Have you tried this system with all the house loads switched of physically? It 
does sound odd that you can time the swings but could it be something in the 
house drawing around the 400 watts for a few seconds? the XW may just be 
responding to that? 
If all else fails try switching off all the breakers in the subpanels and see 
if it still does it.

Alternative Energy Systems of Maine
57 Hemlock Rd
Corinna, Me 04928
www.solar4maine.com
207-416-2006
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