question

bernhards avatar image
bernhards asked

Shunt before or after MCCB

Scenario:


a) MP2 and MPPTs --- Lynx --- Smart Shunt --- MCCB --- Battery

Or


b) MP2 and MPPTs --- Lynx --- MCCB --- Smart Shunt --- Battery


The smart Shunt should act as a battery monitor on Cerbo GX. The MCCB is used to break the line manually or if certain real bad circumstances occur.

Should the smart shunt be before the mccb or after?





SmartShunt
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1 Answer
Alexandra avatar image
Alexandra answered ·

@BernhardS

I would have it right by the battery before the disconnect. And ideally it needs to be closer to the battery for accuracy you can get volt drop through a disconnect.

It can be installed after the mccb there is a setting where it keeps it's last SOC on power up.

It has its own fuse. So would be safe before the disconnect and is not a high draw item.

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bernhards avatar image bernhards commented ·
Thanks for your answer.

I wonder what happen, if the shunt is between Battery and MCCB and if the MCCB disconnects. The shunt is still able to measure the Volts of the battery and would tell MP2/MPPT via the Cerbo the current Volt. Would MP2/MPPT try to load the battery or get power from the battery which would technically not be possible as the MCCB has disconnected? Does MP2/MPPT detect this failure or take damage?

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