question

jsmvanwyk avatar image
jsmvanwyk asked

Battery Discharges even though there is enough PV available to cover the load

Good day. We have an interesting case whereby a system with battery discharges when running on ESS (with and without battery life has no impact). The minimum SOC is set to 30%. There is no Dynamic ESS loaded and we are one firmware version 5.08. the system is 3 x Multiplus II 5000's in parallel. There is 5 x 5.3 kWh battery backup installed. See the screenshot below. Any idea why the PV would not carry the load and the battery discharge the bare minimum? 1718026801629.png

ESS
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6 Answers
jsmvanwyk avatar image
jsmvanwyk answered ·

Hi, thought I'd update everyone. Managed to get this sorted out myselff by changing one of the Slaves to the Master and vice a versa. Even though all Multiplusse were on the same firmware, I'm wondering if the "old" Master doesn't maybe have a slight issue. System works fine now and no more discharge of the battery even though enough PV is available.

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Duivert NL avatar image
Duivert NL answered ·

hi what is your grid setpoint?

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Evan Rose avatar image
Evan Rose answered ·

Hi, I am also seeing this. PV was enough to cover load, battery was 100% and grid point was set at 50w. Yet inverter was discharging at high amps.1000000012.jpg

I checked everything as much as I could, but I'm at a loss...


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nickdb avatar image nickdb ♦♦ commented ·

Rather open a new topic since yours involves PV inverters, grid parallel loads, and the OP didn’t, so more than likely unrelated. Document the environment and settings in detail. Thanks

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shaunuk avatar image
shaunuk answered ·

Put a clamp meter on the grid. I think when multiple cts are connected there is a bug where it looks like power is exporting but it’s not, getting this on multiple systems ac loads are being shown on the grid side


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nickdb avatar image nickdb ♦♦ commented ·
Many times the clamp is orientated incorrectly so reads inversely.
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lifeingalicia avatar image
lifeingalicia answered ·

1720272089899.png

Stating the obvious configured as 3 phase system?

https://www.victronenergy.com/media/pg/Energy_Storage_System/en/multiphase-regulation---further-information.html



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jsmvanwyk avatar image
jsmvanwyk answered ·

Hi Apologies, only now getting back to this.

1. My grid set point is at 0W as we can feed back to the grid

2. It is a single phase system so multiphase regulation will have zero effect

3. Verified with a clamp meter and It is real power flow

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