question

Difficult to assess without knowing what the equipment is setup like and what controls the charging of the battery yet I do see a NRN (Nice Round Number) as an output value on the Shunt screenshot for the Current. Shunt report 100% SOC so battery is full. Given that you state you are using LifePo4 at low C-rates, could it be that you are limiting the Watts as a result of limiting the current of the battery? P=U*I

The equipment is of course setup in the most direct and comparable fashion. A battery solar panels and a smartshunt in between. No loads.

Go measure first and assess the Smart Solar accuracy yourself, before hypothesizing upon the setup. I have a realtime current meter and it reflects the values of the smartshunt, not the ones the Smartsolar reports on the current that supposedly goes in.

Victron must know this, which is why the abstain from a clarification here.

What I don't understand? Don't you have a current meter to carry out measurements on your own setup rather than hypothesize?

So far not a single person has vouched for Victron's SmartSolar.

I regoogled and the answer is here: https://community.victronenergy.com/questions/1858/innacurate-smartsolar-current-measurement.html

Victron isn't even claiming a 5% Tolerance ( i wish it were that low), they are just saying that any reported value is fine with them (as long as the shown value is positive).

Tolerances will vary by surrounding EM fields, heat, peak power point and may well be higher than 5%.

I recently bought the Smartshunt.

And I own an Mppt Epever 3210 controller and a 300 watt panel.

The power detected by the Epever and Victronenergy Smartshunt controllers is surprisingly almost identical !!!

As well as the measurements of Voltage and Amper, of the "LOAD" output of the Epever Mppt controller are identical to those of the Smartshunt.

In these case:

Victronenergy Load current 2.72A

Epever Load current 2.67A

Victron power 34 watts

Epever power 33.77 watts

Victron voltage 12.66 volts

Epever voltage 12.65 volts

And i think Epever mppt controller dont detct its own consumpitions (Lcd display and wifi module). And Victron Smartshunt detect these micro-consumpions and result.

I've never tried over 200 watts. Because it's winter!

So in my opinion the difference you notice is a bit too much.

Especially considering that the victronenergy MPPT controller costs more than 1/3 more than the Epever MPPT controller. And it can't be explained by tolerance.

It looks like you are using the app and switching from the controller to the shunt screens and expecting the numbers to be identical on the shunt to what they were on the controller when you last viewed it.

Even the phone clock in the screenshots are a minute apart.

I think simultaneous measurement is necessary.

How about comparing shunt current and amp clamp readings?

Now that I think about it .. There is definitely something wrong with the Smartshunt setting. (Charging efficiency, capacity, tail current, "battery charged" voltage.

How is it possible that the panel still charges 13A and the Smartshunt detects SOC 100%?

This indicates that the SOC 100% sync settings are wrong.

With solar charge, on the Smartshunt a very low tail current (1.5 / 2%), a high "battery charged" voltage (13.5 / 13.6v .. almost as much as the floating voltage of the mppt controller) must be set.

Otherwise the Smartshunt will sync to 100% Soc long before reality.

I have set a tail current of 1.5%, a "battery charged" voltage of 13.6 v and a "battery charged time" of 8 minutes.

In this way, the Smartshunt syncs every day at 100% Soc, precisely when the mppt controller(or alternator) has finished charging. That is when it charges less than 1.5A while floating.

And when the Smartshunt scores around -1ah in the battery.

Instead, with the default settings, it would sync to 100% soc, much earlier ...

That is when the battery still lacked 5/6 ah .... and the mppt controller was still in the absorpion phase.

This obviously has nothing to do with the difference in detections.