Efficiency Tests - SF 2400 AC

[Youpimatin]

Hi all, here is a test that took me about an hour to conduct with the help of a smart plug,
waiting for values to stabilise and get good averages.

Hardware used :
1 * SF 2400 AC (Z1 in)
1 * AB3000X (B1)
1 * Lidl Silvercrest SAPZ 1 A2 (Prise Z1)

Values are raw, not arranged, you can see the variations, mainly at low powers:

The efficiency results in CHARGE mode :

X : Theorical input from the mains (output_pack_power)
Y1 : AB3000X_power / output_pack_power
Y2 : AB3000X_power / Smart Plug Power

You can see there are differences between SF 2400 AC and the smart plug power input values.
I think my smart plus power measurements are better at low powers than the SF ones, as I can see they are a little OFF, compared to :
A Shelly Pro 3 EM
A Smart meter 3 CT
My smart plug
My house power counter

As for the AB3000X power values, I don't have any tool to measure the real power input to the battery, and I have to trust the values ​​given by the BMS.

Best CHARGE efficiency seems to be between 700 W and 2400 W

@FireSon :
I'm reacting to the general shape inverter efficiency chart shown in the pre-release :

• In CHARGE, I think the optimal efficiency range is not just around 30%
• The charger eats around 20W minimum when used, so to compensate you have to gain about 1% efficiency by using multiple SF 2400 to charge compared to only one, which appears difficult to me

I have the possibility of doing charge and discharge tests with a Fluke power analyser like this one :

But I want to get your opinion before, do you think the advanced efficiency tests I plan to do will be useful to improve the integration ?

[Youpimatin]

No answer ? Nervermind.

OK guys and gals, I've done a lot a work for the community last night, for 3 hours.

Sorry for the missing 2400W charge point, my battery BMS didn't want to accept this amount of charge and limited at in the end of the charge test (AB3000X 62% SoC, 27°C, 51V ; SF2400AC 39°C, by the way)

Here is the result of my tests conducted with one SF2400AC and one AB3000X :

And a zoom over 80% :

[guidodehek]

Excellent work! I am wondering how these results translate to the situation with three battery modules. My expectation is that the resulta are similar or better.

[Toug19]

@guidodehek : Yes they will be similar, maybe less DC losses with high powers.

[CommanderROR9]

I am running my own efficieny test and my SF2400AC with 4 Battery Modules is settling around 82-85% efficiency. That is with some fast and a lot of slow discharge and the same for Charging.

[Toug19]

The thing is that the efficiency changes a lots versus power. In input and output. You should test at different power levels with stable power.

[CommanderROR9]

I am aware. But for me, what counts is the real life efficiency in my daily use. And that is exactly what I am tracking

[Toug19]

Yes this is also a good measurement but knowing when the efficiency is very low can make you to avoid loosing kwh and enhance the use of the energy. Maybe sometimes it is better to use the energy in an other way than charging the zendure. And sometimes you don't have enough energy in the battery, it is maybe better to avoid to spend it when only a few of kw are needed.