Grid Setpoint not working on parallel 2x Multiplus II 3000-48-230-35-32? How can I fix?

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bonie-wanda asked Aug 12, '22

Grid Setpoint not working on parallel 2x Multiplus II 3000-48-230-35-32? How can I fix?

Hi

ESS Grid Setpoint feature not working. Inverters consuming grid unnecessarily, costing me money.

Single-phase:

2x parallel Multiplus II 3000/230/48/35-32 firmware 2629-497, ESS, Venus GX on ver2.89, bluesolar mppt 150/45, bluesolar mppt 150/35, 4x pylontech us3000 min SoC set at 30%.

Installed a parallel inverter 6 days ago and immediately the grid consumption tracks above the grid setpoint. It worked perfectly when I had 1 inverter.

I have redone setup with QuickConfigure and added the assistants on each inverter. This has not helpled.

The problem gets worse when in Power Assist mode via AC-In, even with enough PV Solar and battery, at this stage, grid consumption increases to hundreds.

Please assist with a solution if you have thanks in advance. Haven’t found a solution on the community pages.

multiplus in parallel ess grid setpoint not reached

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robbiec commented · Sep 29, 2022 at 01:36 PM

Finding the same on a setup with 2 parallel MultiPlus-II 48/5000/70-48. I've had to increase from 50W up to ~>120W to prevent supply onto the grid but the grid supply is far more than double.

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robbiec commented · Sep 29, 2022 at 06:54 PM

Think I sussed out the discrepancy when I realised it seemed to be about 3 times the value. Make sure 'Multiphase Regulation' is set to 'individual phase' rather than split across 3 phases. Seems to have settled back closer to the behavior of a single unit under ESS.

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bonie-wanda robbiec commented · Oct 02, 2022 at 04:37 AM

Thanks. I have changed this setting as required. My installation is single phase if it matters but I’ll monitor and advise.

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Modifications Space

Node Red Space

Answer 1 · 2022-09-29T17:29:44Z

marekp answered · Sep 29, 2022 at 05:29 PM

@Bonie Wanda

Did you check that each MP-II provides equal power to the loads?

Are they balanced?

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bonie-wanda commented · Oct 02, 2022 at 04:38 AM

Not yet. Can I measure with a current clamp meter?

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marekp bonie-wanda commented · Oct 02, 2022 at 05:29 PM

Yes.

Set the constant load and measure the DC current on both MP-IIs.

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Answer 2 · 2022-10-02T04:47:44Z

bonie-wanda answered · Oct 02, 2022 at 04:47 AM

Re-wiring and re-configure

Yesterday 1 Oct 2022 we completely re-wired the 2x inverters. Same lengths, same gauge,

AC In cables
AC Out 1 cables
DC cables

We re-configured the Master-Slave setup, re-captured the settings AND re-installed the ESS assistant on 2x inverters.

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Answer 3 · 2022-10-02T04:56:52Z

bonie-wanda answered · Oct 02, 2022 at 04:56 AM

Venus GX firmware problems

On 16 Sept 2022 the Venus GX firmware was automatically updated to ver2.90. Thereafter the system was showing funny figures and feeding back to the grid ALTHOUGH this setting is disabled.

After rebooting yesterday 1 Oct 2022, it did the same thing, but settled after a few restarts. Firmware is ver2.91 now.

Incorrect Critical load readings;
Incorrect and/or non-existent AC load readings
Feeding back to grid using battery and PV
Showing funny numbers that don’t add up

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