Is there a recommended approach and/or sequence of steps to change an existing battery bank voltage and existing MPPT’s battery voltage setting?
For example:
→ Disable charging in the MPPT, change the MPPT’s battery voltage setting, then turn everything off and reconfigure battery bank.
OR
→ Disconnect PV, turn everything off and reconfigure battery bank, then change MPPT’s battery voltage after it boots back up on new battery bank voltage, reconnect PV.
OR other?
Thanks.
It’s probably best to use 1 of the procedures listed in the mppt manual.
There does not appear to be a procedure for the subject scenario in the mppt manual.
Please note, that in the subject scenario, the mppt has already previously been setup with a system voltage and is no longer in its initial auto detection mode for system voltage.
Best regards.
Please note, that in the subject scenario with an existing mppt in an existing installation, simply changing the mppt’s battery voltage setting could result in some charging at an overvoltage and/or voltage alarms, both in the case of changing the setting prior to reconfiguring the battery bank system voltage and in the case of changing the setting after reconfiguring the battery bank system voltage, depending on the existing and final system voltage.
I believe there is some underlying nuance to the subject scenario and question that the manual and above responses do not address.
Best regards.
As per your thread title and initial post,
this has been fully answered.
Why would YOU do this?
Victron have put a lot of effort into the battery bank voltage auto detection upon initial connection.
And to ensure that firmware upgrades remember batt voltage.
Well for example, if an existing system has been setup and running for a year at say 12V, and the battery bank and inverter will be upgraded to 24V. There is PV currently connected to the mppts, and the mppts currently set at 12V. The auto detection and firmware update responses do not appear relevant for such a system battery voltage change from 12V to 24V in this example scenario.
If anyone else would like to respond with constructive and less dismissive quick responses, it would be much appreciated.
Kind regards.
Maybe this can help you… (taken from mppt manual)
On the settings page, click on the three vertical dots in the upper right corner and select "Reset to defaults” from the drop-down menu.
Un-power the solar charger within 10 seconds.
The next time that the unit is powered up, it will perform the initial automatic voltage detection.
Yeah, it does. I am hoping for some different approaches from the community where one approach might be quicker/better/smoother than another for various situations.
For my setup, I have multiple mppts and reconfiguring existing batteries. It would be nice and convenient, if there was an approach that allowed a voltage change in the mppts, like selecting to disable the charger setting first, and where the charge voltages and maybe other voltage settings in the mppts would double automatically on a battery voltage setting change from 12V to 24V, so I wouldn’t have to reset to defaults and reconfigure all of the settings again. If that’s even something that would/could occur in the mppts after the battery voltage setting change… I then wouldn’t have to fuss with resetting each mppt and quickly disconnecting the battery bank from each mppt one at a time.
Even just disabling the charger setting first and not having to fuss with un-powering within 10 seconds after resetting to defaults would itself probably be more convenient.
Thank you sir.
I successfully reconfigured from a 12V to a 24v system following my first example approach, by disabling the charger in the MPPTs, reconfiguring the battery bank to 24V, installing a 24V inverter, changing the voltage setting in the MPPTs to 24V, and re-enabling the charger in the MPPTs.
Worked like a charm.
Most of the original 12V charge and other settings automatically doubled in the MPPTs. No need to perform a factory reset or anything unnecessary like that.
Just pay attention to your new tail current, and you should be good to go.
Cheers.
