MPPTs switch off when SOC is getting close to 100%

Question

question

marekp asked Dec 19, '22

My two MPPT are switching off when battery SOC is getting close to 100%.

Their power drops for 5-8 minutes and stay off for 10-15 minutes and than comes back suddenly.

Grid feed-in is allowed from AC and DC.

Why is it happening.

MPPT Controllers

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marekp commented · Jan 01, 2023 at 12:13 PM

Today again when MP-II switches to "absorption" both MPPT chargers stopped feeding the system.

I can understand not charging the battery as it is almost at 100% SOC, but why they are not feeding the grid?

Fronius, located at AC-in, is not affected.

I rebooted the GX and MPPT started feeding the grid.

Any ideas why GX acting like this?

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Answer 1 · 2023-01-31T15:30:34Z

Al answered · Jan 31, 2023 at 03:30 PM

I've seen this with a system that has 2 x 250/60 mppt's, ve.direct Cerbo, Pylontech, Multi 5k.

Using DVCC and AC Ignore to charge batteries when low SOC, the grid takes priority and shuts down the mppt's between 97-100% SOC.

I don't know why, but like the DVCC not syncing the mppt's charge state properly there are always a few bugs.

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