Hi all, I have recently installed a Victron system comprising of:
Victron 8kva Multi II
Cerbo GX
Felicity solar 48v 250ah
Smart solar250/70
3 X sharp 580w bifacial
One use case I tried to fulfill was that if the power demand is higher than e.g. 5000 I would like the 5000w to be serviced by Victron and the rest from the grid. For example I have the cooker on= 3000w and the water heater= 4000w so a total of 7000w so I wanted the 5000w to be provided from victron and the remaining 2000w from the grid.
However testing this ended up as soon as the power demand surpassed the 5000w, victron activated the passthrough and allowed the full 7000w to be serviced from the grid.
Any ideas if what I want to do can be accomplished?
Normally, “Power Assist” works the other way round. The shore power is supported by the battery and not vice versa.
So if your shore connection is limited to 10A, for example, the Multi uses the battery at higher loads …
Your battery would also be too small with a typical 100A discharge current.
Do you get a warning from the battery / BMS?
Hi and thanks for your feedback,
The full story is that the victron is connected to a netmetering system that comprises ofn
A fronius gen24 plus
A BYD HVM 11.04kwh
4.92kwp of solar.
Currently I am treating the grid (and the fronius system which works in parallel) as a generator.
I have relay 1 activated either on demand or every day at 10am and leave it open for an hour and a half.
Relay 1 mostly works as passthrough with a 5amps charge of the battery.
I can also activate relay 2 for additional charging power of 40amps. Relay2 works only if relay1 is open.
What I want to do is maximize the usage of solar so the way I thought about it was to have the victron service power demands up to 1740w (Which is the pick power of the solar panels) and transfer the rest of the demand to the grid (which in my case will prioritize the fronius).
By the way maybe power assist woukd also work. I would prioritize grid (Fronius system in my case) to service power demand of 3000w and from then on supplement with Victron.
Can I do such a parameterization through Cerbo GX or do I need to access the multi directly ?
Then you could only solve the whole thing via a “virtual contact”. In this case, the multi remains disconnected until a certain power is called up … You can use several Set conditions.
Adjustable via VE Config …
Why do you want to open the Multi to connect the MK3? You could also change the setting via VRM remote configuration … so no MK3 … and no opening of the Multi
Your solution does not work when the network is connected. Here you would always try to save the battery. You could set an input current limit … but that would not solve the problem …
So only with a virtual switch and thinking the other way around …
If your system is registered in VRM, this can be done via the remote configuration.
but of course you need VE Configure …
After editing … SAVE … then upload … Done
Are you sure the battery is not shutting down? Looking at the spec sheet, it can only do 120A and has a shutoff voltage of 48V. It can do 150A for 15 sec. Are you able to install the ESS assistant? There is a setting to limit inverter power and the rest comes from the grid.
The installer said that the ess is used mostly for feeding power to the grid. That is why it hasnt been installed.
I will read about it and will revert back
The ESS is used to use as much solar yield as possible to cover the grid load. In the ESS settings you can simply set the value for the maximal inverter power to 5000 W, or to any other value.