Victron energy Shunt

Dennis 1

New Member
Joined
Sep 13, 2020
Messages
91
My question today is I just purchased a Victron Energy 500A Smart Shunt. I have 3 - 100ah lithium batteries installed in series with the positive hooked to the first battery and the negative hooked to the 3rd battery.
I thought I would just hook the shunt battery bolt to the negative cable on the 3rd battery and everything else off the other side of the shunt. Now I see when you have a battery bank that it gets measured half way which has me all confused.
So if anyone knows what is the best way to install this shunt I would sure appreciate the help. I will be redoing and cleaning up the wires with the Victron Energy Lynx Power In and the shunt you see will be replaced with the new one
 

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rmaddy

Full-time Solar-powered Trailer Life
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Your wiring isn't ideal.

You should have something like this:

3rd battery negative terminal -> shunt -> negative bus bar

Basically take the wire you have between the shunt and the inverter and use it to connect the shunt to the negative bus bar.

You should also have a positive bus bar. And your breakers shouldn't be shared between loads.

One last possible issue. You have a 12V system and a 2000W inverter. 2000W / 12V / 0.8 is about 208A. This requires 2/0 cable between the batteries, between the batteries and bus bars, and between the inverter and the bus bars. And the breaker between the inverter and bus bars should be 250A. That's what you should have to use the full 2000W. You seem to have 1/0 between the batteries and much smaller wire going to the inverter and a 200A breaker. The 1/0 cable and the 200A breaker are fine but will limit your inverter use a little which may be fine for your needs. But the small wires going to the inverter may be dangerous depending on what gauge they are.
 

740GLE

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Apr 30, 2021
Messages
641
Also that style circuit breaker have been known issues at higher loads.

Might be worth while investing in a class T fuse.
 
Last edited:

Dennis 1

New Member
Joined
Sep 13, 2020
Messages
91
Your wiring isn't ideal.

You should have something like this:

3rd battery negative terminal -> shunt -> negative bus bar

Basically take the wire you have between the shunt and the inverter and use it to connect the shunt to the negative bus bar.

You should also have a positive bus bar. And your breakers shouldn't be shared between loads.

One last possible issue. You have a 12V system and a 2000W inverter. 2000W / 12V / 0.8 is about 208A. This requires 2/0 cable between the batteries, between the batteries and bus bars, and between the inverter and the bus bars. And the breaker between the inverter and bus bars should be 250A. That's what you should have to use the full 2000W. You seem to have 1/0 between the batteries and much smaller wire going to the inverter and a 200A breaker. The 1/0 cable and the 200A breaker are fine but will limit your inverter use a little which may be fine for your needs. But the small wires going to the inverter may be dangerous depending on what gauge they are.
Sorry I don't know what I was thinking at the time, I knew they were in parallel.
I will be using the Victron Lynx Power In with a fuse for each load off the Power In bus bars. So I need at least 1/0 from the inverter to the Power In busbar right now I have 4awg. I know that I do not use near the 2000w for the inverter I have.
I also have a Victron1200w inverter (not installed yet) I have to run a pump motor that is plugged in from a ATS that needs to be plugged in 24/7 so when the pump motor is called for it will come out of ECO mode. I will be using 2awg wire and a 150a fuse there is a 200a fuse inside the inverter
Thanks for the advice
 

Dennis 1

New Member
Joined
Sep 13, 2020
Messages
91
Your wiring isn't ideal.

You should have something like this:

3rd battery negative terminal -> shunt -> negative bus bar

Basically take the wire you have between the shunt and the inverter and use it to connect the shunt to the negative bus bar.

You should also have a positive bus bar. And your breakers shouldn't be shared between loads.

One last possible issue. You have a 12V system and a 2000W inverter. 2000W / 12V / 0.8 is about 208A. This requires 2/0 cable between the batteries, between the batteries and bus bars, and between the inverter and the bus bars. And the breaker between the inverter and bus bars should be 250A. That's what you should have to use the full 2000W. You seem to have 1/0 between the batteries and much smaller wire going to the inverter and a 200A breaker. The 1/0 cable and the 200A breaker are fine but will limit your inverter use a little which may be fine for your needs. But the small wires going to the inverter may be dangerous depending on what gauge they are.

Also that style circuit breaker have been known issues at higher loads.

Might be worth while investing in a class T fuse.
Do you mean the bolt on Mega fuses, thats what I have for the Victron Lynx Power In.
 
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