Battery monitor reading?

[Mickie]

I bought a battery monitor as seen in the attached picture. I think the configuration is correct but for some reason the AH keeps going up ad it charges its as if its reading amp hours coming in from the charge controller. As my battery back is 200ah at 24v but ah on the shunt is now showing over 400. Would it make a difference if i removed the shunt from the same negative terminal as the charge controller and put it on a different negative?

 

[400bird]

Everything needs to go through the shunt (at the most forward connection in the picture)

There appears to be another cable on the negative of the rear battery, but the focus on the picture means I can't tell for sure.

 

[Mickie]

Everything needs to go through the shunt (at the most forward connection in the picture)

There appears to be another cable on the negative of the rear battery, but the focus on the picture means I can't tell for sure.

The negative wire from the charge controller is connected to the battery on the same terminal as the shunt..

 

[400bird]

The negative wire from the charge controller is connected to the battery on the same terminal as the shunt..

Connected to the battery but not to the shunt?

The shunt should be wired up with only battery on one side and everything else on the other.

 

[Mickie]

The white wire with the black tape is the negative charge coltroller wire.
You are saying that that white wire needs to also be at the front of the shunt?

 

[400bird]

The white wire with the black tape is the negative charge coltroller wire.
You are saying that that white wire needs to also be at the front of the shunt?

Yes, exactly that.
For the shunt to work, all energy (in both directions: charge and discharge) needs to go through the shunt. As it is, all the shunt sees is the discharge.

 

[Mickie]

Yes, exactly that.
For the shunt to work, all energy (in both directions: charge and discharge) needs to go through the shunt. As it is, all the shunt sees is the discharge.

Thanks. did some research just now and realised .

 

[mikefitz]

The device you have is not a battery monitor. It cannot compute current direction, thus is not able to determine the true battery state.

I think I ordered a useless battery monitor (PZEM 015)

Hi guys, I ordered a cheapo battery monitor (threw all my monee in the lifepo4 lol) here it is, and I was wondering something, the SOC displayed on the screen should not be accurate since it is not a coulombmeter but just an estimation based on the voltage. Since I have a lifepo4 the voltage...

diysolarforum.com

 

[400bird]

Wow, if that thread is to believed, this meter belongs in the trash, not hooked up as I described.

 

[Mickie]

Does anyone have experience with the TBD smart shunt?
Is it as good as the victron smart shunt or not good?

 

[mikefitz]

There exists a lot of experience and support for the Victron Smart Shunt. You get 5 years warranty and automatice updates ( if needed) with Victron
The TBD is a copy, even the diagrams are coppied from the Victron instructions. I suspect it cannot communicate with other Victron products

TBD SmartShunt

https://www.amazon.com/dp/B09KNJ4Y7B/ref=cm_sw_em_r_mt_dp_SE6SFF695SZTDPSBE0CA This thing looks inexpensively interesting. Anyone tried it out? I'm not too interested if there is no way to get the data out, but that UART port looks promising. Sure looks oddly similar to an identically named...

diysolarforum.com

 

[Mickie]

There exists a lot of experience and support for the Victron Smart Shunt. You get 5 years warranty and automatice updates ( if needed) with Victron
The TBD is a copy, even the diagrams are coppied from the Victron instructions. I suspect it cannot communicate with other Victron products

TBD SmartShunt

https://www.amazon.com/dp/B09KNJ4Y7B/ref=cm_sw_em_r_mt_dp_SE6SFF695SZTDPSBE0CA This thing looks inexpensively interesting. Anyone tried it out? I'm not too interested if there is no way to get the data out, but that UART port looks promising. Sure looks oddly similar to an identically named...

diysolarforum.com

I dont have any victron product currently and there is still the fact that the victron costs more than double the cost of the TBD.