Frequently Asked Question

CLASSIC - ALARM - OCP Explained
Last Updated 3 years ago

OCP stands for Over Current Protect.
This mode kicks in to protect the Classic from damage.

Things that cause OCP are:
Bad Inductor inside the Classic (repair needed)
Defective Classic Control circuit board (Main CB)
Defective Classic Power board (Has the Inductors soldered to it)
Bad or Weak battery or bad connection of wire or wires. (corrosion / resistance / loose)
Classic sharing the inverter battery cables (Classic connected to battery bus bars near the Inverter)
Cables and/or wires for the Inverter or Classic too small. (not correct AWG)
This can cause surges in the Inverter to attempt to pull more current from the Classic that it can provide.
If OCP does not activate fast enough the Transistors in the Classic are damaged (shorted out, smoked, burned)
The quickest & easiest thing to blame is the Classic, but sending it in and finding nothing wrong is a waste of time & money. That being said, all the other issues need to be checked and verified before assuming the Classic is broken.

OCP is OFF showing on the MNGP means it was activated but now is idle.  This message has some customers concerned.  There is nothing to be concerned about, it is just armed and ready for the next "protect event".  The newest firmware has been adjusted so this message is not as persistent. Usually power-cycling the Classic makes it go away.  The long term solution is to either rewired the Classic direct to the battery or increase the size of the battery wires to the inverter or BOTH.

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