VRM ext. control

hey,

two systems both BMS controlled with DVCC.

no. 1 has a 123smart BMS

no. 2 Pylontech

all MPPTs under external control (Connect App)

but on VRM No. 2 ext. control is missing.

i´m asking because i have trouble with system no 2, MPPTs stopp charging every day for no reason at noon.

https://community.victronenergy.com/questions/223489/smartsolar-mppt-vecan-15070-stops-charging.html https://community.victronenergy.com/questions/223489/smartsolar-mppt-vecan-15070-stops-charging.html

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seb71 commented · Aug 18, 2023 at 07:22 AM

My MPPTs are on External Control, because I use ESS. If I open the MPPTs in VictronConnect, they show "External Control".

But in VRM dashboard, "External Control" tag is not shown in my system either.

So check how they appear in VictronConnect.

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Lars Filusch seb71 commented · Aug 18, 2023 at 07:29 AM

as i mention in my post,

all MPPTs under external control via checking the connect app.

both system w/o ESS.

the difference are the BMS, Venus device and the MPPTs.

Pylontech with 150/70 CAN

123BMS with 100/20

the 123BMS works perfect ( raspberry pi)

the MPPTs with Pylontech w/o the "ext. control" in VRM stopp charging for no reason (cerbo gx).

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seb71 Lars Filusch commented · Aug 18, 2023 at 07:36 AM

Have you checked the cell voltages when the charging is stopped?

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Look in VRM advanced at "Solar charger summary" widget which state is displayed.

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Lars Filusch seb71 commented · Aug 18, 2023 at 07:53 AM

yes,

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bildschirmfoto-2023-08-17-um-095537.png (505.9 KiB)

seb71 Lars Filusch commented · Aug 18, 2023 at 08:01 AM

And cell voltages?

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Lars Filusch seb71 commented · Aug 18, 2023 at 11:37 AM

not able to take a look to the cells, only pack voltage and temp.

I know cerbo shut show cell voltage but it doesn't. maybe older fw on the pylontech. But there is no current or voltage limitation. i did a factory reset on both mppt´s, and reset the parameters as before, until now both are charging full power. fingers crossed. but why the VRM overview ext. control is missing?

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seb71 Lars Filusch commented · Aug 18, 2023 at 12:04 PM

but why the VRM overview ext. control is missing?

I don't know.

It's missing on my system, too on the VRM Dashboard, like I said (but present in VRM Advanced, like in your case).

there is no current or voltage limitation

A BMS can stop the charge if just one cell gets to a voltage which is too high. The battery voltage can be in normal limits.

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Lars Filusch seb71 commented · Aug 18, 2023 at 12:30 PM

A BMS can stop the charge if just one cell gets to a voltage which is too high. The battery voltage can be in normal limits.

i know, but should we see a voltage limit to stopp charging? if charge voltage is equal to pack voltage there is no more current flowing in to the battery, but still supply to all loads.

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