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Posted

Hi All,

 

I recently (Sunday) installed a Deye 5 kW inverter with a Shoto 5.1 kWh battery. I'm monitoring the system on Home Assistant via the SolarMan API.

 

I've seen a weird occurrence on the battery state of charge. It looks like from time to time the charge drops to 0% for about a minute and a half and then recovers. It has been happening more and more (once a day to now three times a day) When this happens the power drawn by the inverter also spikes to about 5.5 kW.

 

Not sure if this is maybe a BMS issue?

Posted (edited)

Hi Neil. Same setup as me.

Maybe have your installer check it (battery) out. There are threads here that suggest some of these batteries needed the BMS replaced. In my battery, one or two cells were not performing as expected. My symptoms were not dropping the charge however. Mine would throttle the charging and then at some point it would not cycle to the set DOD. Either way. My issue got sorted out via my installer.

I assume yours is connected via the CAN port for comms?

 

Edited by GTP
Posted
7 hours ago, GTP said:

Hi Neil. Same setup as me.

Maybe have your installer check it (battery) out. There are threads here that suggest some of these batteries needed the BMS replaced. In my battery, one or two cells were not performing as expected. My symptoms were not dropping the charge however. Mine would throttle the charging and then at some point it would not cycle to the set DOD. Either way. My issue got sorted out via my installer.

I assume yours is connected via the CAN port for comms?

 

@GTP Yes that is correct. How did you know that the charging was being throttled?

I've attached an image of the battery SOC for reference.

Screenshot_20220505-203547_Home Assistant.jpg

Posted

I have the same solarman to home assistant integration setup and see the same with SOC as you.

If you look at other parameters at the same time you'll also see weird spikes but this doesn't show up on the solarman app.

I don't think there's any issue with the way the inverter is operating, just the way some data sets are processed. 

Screenshot_20220507-092037_Home Assistant.jpg

Posted
On 2022/05/06 at 8:11 PM, neillherbst said:

@GTP Yes that is correct. How did you know that the charging was being throttled?

I've attached an image of the battery SOC for reference.

Screenshot_20220505-203547_Home Assistant.jpg

I am inclined to agree with Seedadster. I dont see anything typically out of whack there.

What i meant by throttling was that my charge power to charge the battery would drop drastically when the battery got to a certain value. In my case that value was below the expected threshold. Around 65% (although it varied.). So what i saw was the battery would limit charging. I guess it was a self health mechanism.

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