Hello dear community,
I am seeking everyone’s expertise and ideas.
I am facing a system with 90KVA of Victron converter (6x Quattro 15KVA) with Fronius Symo Advanced 20KW PV inverters and 90 kWh of battery storage from Pylontech. The system is coupled by the generator + Grid through an ATS. (Which means that the AC input is always available because it is a hospital, so the energy source is mandatory). But in our settings, we ignored the AC input depending on the SOC of the batteries (if the batterie SOC is less than 30% AC input activated, 40% ignored). I have three scenarios which are the following:
- The production of the Fronius inverters is unstable if the main circuit breaker of the AC input is closed, the frequency is never stable.
- If we open the AC input circuit breaker, the production of the Fronius inverters is stable.
- I also specify that when the batteries are below 30%, the generator or grid is active and the inverters let the current pass through. And in this case, the Fronius inverters are also stable.
Could you therefore guide me on point 1 please?