Victron open circuit voltage

[funflair]

Question for Victron people, what should the voltage be off the controller when not connected to a battery, it’s connected to and possibly part of another issue but it’s a long story.

 

[Jabstatt]

I think we need a little more clarity here.

Victron what?
Not connected to what battery?

Help us to help you!

Tony

 

[funflair]

I think we need a little more clarity here.

Victron what?
Not connected to what battery?

Help us to help you!

Tony

Yes sorry, brain frazzled, Victron solar MPPT on Lithium batteries but batteries tripped so solar is putting over 16v out and into the system which trips the CBE system.

 

[Ditcha]

Question for Victron people, what should the voltage be off the controller when not connected to a battery, it’s connected to and possibly part of another issue but it’s a long story.

Not sure this is relevant or not but if it's a mppt controller you should always connect battery first then solar and disconnect solar first then battery this is how the controller knows whether or not it's 12v or 24v system.

 

[funflair]

Not sure this is relevant or not but if it's a mppt controller you should always connect battery first then solar and disconnect solar first then battery this is how the controller knows whether or not it's 12v or 24v system.

Yes I thought I read that Victron remembers the original battery voltage but as you say possibly not relevant.

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[daveclare]

Go into the mppt menu and check it hasn't changed the battery default voltage to 24v. We had a faulty one which had done this and fried my fridge, control panel and truma circuits.

 

[funflair]

Go into the mppt menu and check it hasn't changed the battery default voltage to 24v. We had a faulty one which had done this and fried my fridge, control panel and truma circuits.

Still showing 12 volts but the problem is that the batteries have shut down so the Victron controller is not seeing a battery at all but was still outputting to the system upstream of the batteries but at 16 volts, somebody said that was too high irrespective of a battery or not but I thought that was just because it wasn’t being absorbed by and getting feedback from a battery.

 

[Ditcha]

What does the victron connect app show in the history tab for the mppt max voltage reading

 

[AdrianChen]

Still showing 12 volts but the problem is that the batteries have shut down so the Victron controller is not seeing a battery at all but was still outputting to the system upstream of the batteries but at 16 volts, somebody said that was too high irrespective of a battery or not but I thought that was just because it wasn’t being absorbed by and getting feedback from a battery.

Yes I wonder if it's trying to compensate for what it thinks is voltage drop in the cables?

 

[Ditcha]

From here ?

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[Jabstatt]

Disconnect solar from MPPT. One wire, carefully!
Reboot batteries, however that is done, manual should explain.
Reconnect solar.

Pray!

Good luck.

Tony

 

[Diabalo]

I would disconnect all the outputs from the controller leaving just power coming in from the solar panels and see what the output voltage is. I had a similar issue and it was the controller gone rogue putting out too much voltage and the panel shutting down to protect itself.

 

[funflair]

Disconnect solar from MPPT. One wire, carefully!
Reboot batteries, however that is done, manual should explain.
Reconnect solar.

Pray!

Good luck.

Tony

And there lies the problem, I rebooted the batteries but there are 4 batteries and 4 bi-stable relays and one of them had fried itself, the solar thing was just a product of the batteries going off line I think, anyway went into Premium at Doncaster and Joshbthe tech came straight out checked batteries and all OK so checked relays and changed one, luckily they had one on stock.

Can’t fault them for service that’s for sure

 

[TheMobileWanderer]

Pleased that you got it sorted out Funflair.

When saying bi-stable relays, do you mean there's a relay connected to each battery that is connected in parallel to another?