Apologies, i have no experience controlling Fronius via node red or any other device, I only use the Cerbo inbuilt control and it can control the feedout and charging. My only aim with this firmware was to end the irritating flicker, and it did (I assume you are using Victron?)
You can search the forums, I have seen a number of posts where people discuss controlling the export (watts) with the Cerbo. (Grid setpoint: the value can be -ve (export) or +ve (import)) This might be a better approach, otherwise you just land up fighting the cerbo that is also giving Fronius control parameters and clashing with what you are asking it to do. Search the forums for âcontrolling grid setpointâ. Key is you will put the cerbo Mode into âexternal controlâ, and do everything yourself in Node Red. You can run Node Red on the cerbo
Appreciate the help.
The only reason Iâm trying to limit output with HA is the Primo keeps throwing a 435 error when it starts to produce more power than Iâm using. Could be a fault with the Primo.. I also run VenusOS on a Rpi4.
I need to try and find the register list for the Primo, as I think Iâve accidently made a change I now canât find. Primo only outputing ~ 50%, ramps up on a reset, then throttles back within a couple of seconds..
Noticed my AC voltage swings from 210-250 (probably wider, but too brief for me to see). Is this normal when coupling a grid tie inverter over a victron?
There is roughly a 25m run of 2.5mm back to the Victron.. with breakers and a earth leakage in the run⌠I could run a straighter 2.5mm run direct from Primo to Victron I guess.. just as a test?
What is the primo (size) you are using. 2.5mm2 cable would be good for maybe 2kw.
Another thing- when you see the voltage swing: is that at victron or fronius side? If at victron, you might have full battery and victron has no where to âputâ the energy. If you donât have network connection between Fronius and cerbo, victron only has frequency shift available to throttle the fronius, this takes time
Stable 230v output, until Primo output exceeds system load. Then the V starts to swing. Victron is set to pump up to 1500Watts in Battery bank. But with only ~100watts or so above load, voltage swings build up. bulk light comes on, but typically doesnât stay on long.
DCL CCL , Battery bank can delivery and absorb well over what is causing dramas
3000mp (EasySolar)
Primo 3kw
~1000watts of panels
GX s VenusOS on rPi
frequency shifting only flickers from 49.9-50.1. Although bulk light comes on, and batteries can take a lot more power than what it takes to start going wonky..
HUH. This morning, the mischievous gremlin left the system.. Its just working!!
Unsure what remedied the situation though :P. Thanks for the support guys
So I found something interesting! If I set the soft limit say 50 watts above the power being created by the primo. Both the flicker dissappears and so does the 435 error! Now Iâll just need to work out an automation to do this and, problem solved!
