Why is the Discharge current of the Multi RS 6000 capped at 100A since firmware update V1.27?
When I try to disable the discharge current limit via Victron Connect, the change is not being applied and the 100A limit remains intact.
However when I switch back to firmware V1.26, I can disable the discharge current limit, which result in being able to draw as much as 120A from the battery.
Which is exactly what I want when I am feeding back into the grid and also powering loads in my house. With the 100A current limit, I can feed back a lot less…
Are you sure that’s sane for a 5300W (at 52V and 25C) inverter to draw more than that? You are drawing 5660W…
Indeed it says 6000 in the product advertising, but the specs say otherwise.
Continuous output power at 40C, 4500W… And at such load, for sure it has 40C..
The inverters sit in my garage with an ambient temperature of 15 degrees C at the moment.
The datasheet shows a continues output power of 5300W at 52V and 25c.
I may presume that the inverters will automatically throttle down if they get too warm.
Keep in mind that I am not putting a 5600W load on the inverters, the output power is just a setpoint given by DESS.
This system has been running for the entire 2025 at full load without any issues.
Mosfets should have no issue at 70 or even 80 degree C. So if the 25 degree C from the datasheet is not ambient temperature, but mosfet temperature, then it would be better to not mention it at all because 25 degree mosfet temperature would already be achieved during idle loads.
If the 100 means both charge and discharge, why do the Multiplus 5000 discharge at nearly 100A, but only charge at a max of 70A?
This makes no sense at all.
The picture below shows a 3x MP2 5000 system, running DESS and discharging almost 300A from the battery.
there is no discharge current limit for the multiplus 5000, so they achieve the same output power as the Multi RS 6000 now? (post firmware update)
Are you running DESS?
It is an intended changed BTW. Ref: the changelog.
Changes to the Continuous output power of the Inverter for DESS applications: The power set-point will be automatically capped to 100A DC which means that 5000W at 52V will work but 5000W at 46V will become 4600W due to the 100A current limit. Please note that if you have another source connected to the AC-Out of the Multi RS which is feeding in (like an AC PV inverter) then the power set-point can be set higher (like 6000W) while the Inverter still only delivers up to 100A DC and rest comes from the other unit.
Yes I am running DESS and I wanted to know why this change was made, because since the firmware update, my system has a lot less potential for feeding back into the grid, which is why I revert back to firmware 1.26.
Because in the case of MP2, the discharge is handled by the MOSFETs directly (PWM and all..), while when charging, the battery is charged by also using the reverse diodes inside MOSFETs. So it should be lower for the sake of reliability.
Well I updated the firmware because I also have a Smartsolar RS450/200 and I want to be able to feed into the grid when the battery is full, which seems only possible from firmware V1.27…
Changes applying to MPPT RS: Restore communication between the MPPT RS and the Multi RS/Inverter RS. This fix makes them pair again, so they can exchange charge parameters as well as make the Multi RS take control of the charge voltage required for feed-in of excess power.
- Add feed-in control for DC coupled MPPT chargers for the GX (currently in beta test). If your sources (DC coupled MPPT chargers) provide more charge current than the batteries can absorb, the Multi RS can actively push the excess energy into the grid.
and this:
In a combined system with the Multi RS and MPPT RS the system was unable to push excess energy from the MPPT RS via the Multi RS into the grid.
Yeah that is just a provision as it is still not a released feature.
Feedback noted though. Not everyone has AC PV and so will not appreciate the restriction from the battery side. It will be interesting to see if it restricts the dc pv feedback.
Noted as well. As a thought it seems that the changes are aimed so that ac pv can be used more efficiently/effectively in feedback. I can see the logic in it anyway.
Ahh the eternal evolution of the Victron system.
Your blue box problem is terminal. Sorry…
I’m curious what made you go for a separate external MPPT charger when you’ve already got a pretty decent MPPT setup built into your Multi RS units?
