Builiding of a complete 6kW PV inverter with MPPT chargers

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Joined: 11/02/2018
Location: Australia
Posts: 1892
Posted: 08:52am 02 May 2024      

If this is going to be a rare event perhaps simple crowbar protection will do.
A suitably rated fuse at each MMPT output gets blown by a SCR triggered by over voltage at the output. To protect the SCR from the peak battery current a series resistor** that limits the current to 2 or 3 times the fuse rating should be in series with it.

** A suitable length of iron wire could be wound around a ceramic bar radiator element. After the fuse has blown it will be absorbing the current from the panels so it will get hot.

Eg if the resistor is 0.3Ω and the panels can produce 50A it will dissipate 750W.
The ceramic radiator elements are usually 1kW.