I'm planning to set up a solar energy system where photovoltaics (PV) will be my main power source, and I'll use the public grid as a backup—no batteries involved. The plan is to connect the PV output through an inverter and then into an automatic transfer switch.
I'm considering the Victron Filax 2 for the transfer switch. From what I can see, its transfer speed seems sufficient, and it can handle a maximum transfer capacity of 16A at 230V, which should be enough for my needs. However, I'm concerned about how to handle times when my PV system might not generate enough power for my consumption, to avoid blackouts.
Can the Victron Filax 2 monitor both the load and the available solar power, switching only when the available PV power exceeds the current load? Or does it just switch based on which source is available? Any advice would be great!
4 Answers
One more thing to consider—having a grid pass-through feature in your inverter can eliminate the need for a separate transfer switch. It simplifies the setup and can be more efficient when managing power sources.
Transfer switches can be harsh on appliances if they are switched frequently, so it might not be the best solution. In a typical setup, solar systems can auto-regulate their output based on current demand, without needing to constantly switch sources. If you're planning to switch a few times a day, that's more wear and tear on your appliances. Have you looked into grid-tied inverter setups? They pull from the grid only if the solar output isn't enough, which could be a better option for you.
To answer that, yes! You'll need a grid-tie inverter with adjustable settings. They can usually work in a way where they use all your solar power first and only switch to the grid when necessary.
You might want to check out the Solark 15k. It lets you run off your solar during the day and only pulls from the grid when you need extra power. It acts like an automatic transfer switch and inverter all in one, which might save you some hassle with your setup.
I’d recommend reconsidering your no-battery approach. Batteries can really smooth out the energy flow and prevent your inverter from constantly flipping between the grid and your PV system, which can stress out your appliances. They help manage those cloudy days or times when your solar output dips. Just a thought!
Yeah, I get the concern! I've had my share of battery issues too, but a good quality battery system can be a game changer. Just something to think about!
Thanks for the insight! If I want to avoid pushing power back to the grid completely, can I still find a grid-tie inverter that allows that?