I have 4 Multiplus-II with the following configuration:
3 Multiplus as a 3-Phase-System
1 Multiplus as hot-spare in case something will be defective.
Now I have one question. I could configure the hot-spare Multiplus in the same way, like the 3-Phase-Multiplus system but only with one phase.
Will it be possible to turn off the 3-Phase-System Multiplus, disconnect them from Cerbo GX and turn on the 1-Phase Multiplus to the same Cerbo GX (and vice versa - switch off 1 Phase and turn in 3-Phase-System)?
I will never use both, I just want to know whether the Cerbo will work with this switching configuration or not (for example during winter or when something is defective, a 1-phase-system would be enough).
That should or could work, but you’ll need to pay attention to DVCC etc settings.
In general, the Multi or GX don’t care too much.
It’s parameters in the GX that might not work well when transferred from one system to the other.
If you’ve already paid the money for 4x Multiplus and a GX and don’t want extra fuss, just buy a 2nd GX.
It’ll be just so much easier.
But I thought it had charme when using only one Cerbo (because I don’t have to sync the settings between them and I have only one installation on VRM-Portal)
The concept of configuring a mutiplus as a “hot spare” Is invalid. If it has to replace any of a multi in a 3 phase group then it needs to be configured as the proper part of that group.i.e.Master, L2 slave or L3 slave. Once configured, it will then communicate as part of the group. You won’t have to change any of the settings in the cerbo or on VRM.
Hello,
I must have expressed myself somewhat incorrectly.
I bought the fourth Multiplus as a hotspare. In the event of a fault, I must of course program it exactly as the defective Multiplus was and also physically connect the correct phases.
However, as long as all devices are intact, I would connect the fourth Multiplus to phase 1 and configure it as a single-phase ESS system (just like the other three, which are configured as a three-phase system).
As I have almost no PV yield in winter and hardly need less power (but want to save energy), the idea was to simply switch off the 3-phase system and switch on the 1-phase system.
The question is, can I simply do this on a single Cerbo and can it cope with it? Both systems are NEVER switched on simultaneously - but it should be able to cope with the change or not?
If I’m not mistaken, features in the upcoming Venus OS v3.60 release include autodetection & programming of a replacement Multi in a multi-Multi system (sorry for the word garble), without having to manually reconfigure the entire system [citation needed].
Another feature in v3.60 will be the option to back up multiple Multi configurations and switch between them.
So theoretically, you could create a one-Multi config and a 3-phase multi config and switch between them when transitioning in & out of winter season.
During winter season, the two unused Multi’s could simply be switched off (if you’re not using AC Out) and everything be restored to summer mode by the restore of a config - no rewiring or anything else needed!
The big question that remains: is it all worth it?
That’s a question only you can answer.
I don’t have nearly enough information about your install or the cost of switching between the winter mode you described to provide a finite answer to that question.
If you were to ask me for my opinion for my personal situation, my reply would be that it’s good practice to have a spare Multi (and GX) onsite, but that it would be completely futile to reconfigure the system from 3P to 1P for winter season and back.
Sure, it might bring some benefits in reduced Multi auto-consumption, but from my personal point of view it would just create more misery & costs than it would solve.
(I stopped refueling at the slightly cheaper but 20 minute detour gas station after discovering this comic)
Bottom line: if the cost of the time & fuel spent to drive to the slightly cheaper gas station are more than the savings you can make by refueling at the slightly cheaper gas station, the “cheaper” gas station is actually costing you money.
This is the calculation you need to make for yourself.
Spoiler: by the time you have finished your calculation to determine if it’s worth it to switch between 3P summer mode and 1F winter mode, your time spent calculating will likely have cost you more than the savings you can make.
