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Ok, black 10A fuse blowing. What system is not working? It looks like one end of that fuse is tied to your red solar fuse. I'm guessing that wire goes to the battery.
The other blade fuse you found inside behind the control panel, if it's 5A, it may be your water heater fuse.
Trace the wires to see if one end goes to your electric water heater switch on the front of the panel.
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