question

laurentiupitran avatar image
laurentiupitran asked

disparity between DC energy and AC energy in a ESS three phase system, after firmware update

01112020-7.png01112020-6.png01112020-5.png01112020-4.png01112020-3.pngjust finished to update the firmware for 3 units Multiplus 5 kW, including assistants by the company who sell entire system:

- 3 x Multiplus 5 kW

- 1 X Fronius Symo 10,3 kW

- Color GX

- 2 x BYD Pro 10 kW each

- Bmw 700

- 36 solar panel, each 300 w/peak

- ESS three phase system, AC coupling

during update, activities was going well, but after it was finished, we clear observe some discrepancy between energy in AC out and energy from DC part, as in the attached pictures.

please note that there is an measurement independent from Victron system.01112020.png 01112020-2.png

ESSsystem design
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01112020-5.png (248.2 KiB)
01112020-6.png (172.9 KiB)
01112020-7.png (262.4 KiB)
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4 Answers
laurentiupitran avatar image
laurentiupitran answered ·

back in pictures with more data:

- to be sure/accurate , that information on DC part of ESS is exact, i was doing measurements with voltmeter for battery voltage and current clamp for current ; the measurements are same as the Color GX indicate for DC part , including calculus as power in DC .

- i was doing same measurements, for AC part, on voltage with multimeter and with clamp meter for current; also in this case, measurements are according with indication of color GX for the AC parts.

- in all measurement time, i was using approximately a constant load.

- after all of measurements, please try to have an answer regarding the system: efficiency is very bad , means self consummation of each VICTRON product is not as per their specification , or latest software/firmware is not fine regulating the ESS system?


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laurentiupitran avatar image
laurentiupitran answered ·

hi again,


continue investigation:

attached print screen with power consumed from DC/battery and AC part, means house, as load for ESS system

separate, we have indication marked with some yellow color, for the power taken from battery as also for the house .

indicated values shown on picture, are not matching...energy-used-from-battery-and-grid.png


energy-used-from-battery-and-grid.png (388.3 KiB)
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Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

Hi @laurentiu.pitran@gmail.com

Can you explain what numbers are not matching?

How are you measuring AC / DC outside of the Victron system?

What are you using as battery monitor? (in other words: are the battery numbers coming from the battery (BMS) or the Victron BMV?

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marekp avatar image
marekp answered ·

In my system I see efficiency around 86%. 1087/1258=0.8641

I am not impressed. :(

inv-eff.jpg


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laurentiupitran avatar image
laurentiupitran answered ·

return with some new data, so i will wait for some answers.compare-consumption-1.png


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