I’d like to design a DIY solar storage system for our house.
The specifications for the system are as follows: 10 kWp on the roof with a three-phase SolarEdge inverter. The battery should have a voltage of 48 volts, resulting in a storage capacity of approximately 16 kilowatt-hours.
Now, here are my questions: Would a DC- or AC-coupled system be appropriate?
If AC, are there three-phase Victron inverters? What else do I need?
If a DC-coupled system is possible with SolarEdge, what components would be needed?
As a victron community, we can only advise on Victron solutions. If you want to design a SE system end to end, you will need to find a generic or SE forum for assistance.
Victron inverters are individually single phase but can be comprised of multiple systems into a 3-phase config, or split-phase and/or parallel.
Solaredge have endless issues with sunspec, many topics open here for users who are AC coupling them to a Victron system.
For charging a battery, a DC MPPT is always more efficient, but AC is better for supplying loads directly. Typically a mix is chosen.
If you want to AC couple with a Victron system, rather get a Fronius.
All depends on the use case.
There are tons of docs available for you to read and free video training, this may help fill in the gaps for you.
The DIY section, like all our sections, assumes a basic level of knowledge when it comes to these types of systems.
Ideally members have done some research in advance and are looking for more focused advice, since the ecosystem can be complex and quite challenging to someone new to the area.
I understand completly your first point.
I have done my research but I was not able to find a good Tutorial for a DC System.
What would you recomhend to get more knowlage.
If the budget is tight, I would recommend an AC coupled system to begin with and later down the track you can add a DC system to the AC coupled mix, but I prefer to stay AC coupled as you can add a big battery bank anyway without risking AC inverter shutting down in case of battery running out specially if you are grid connected. Both Fronius and SMA modbus can AC couple really well with Victron. You can now purchase quality 16kWh battery 48V stacks from the likes of Ruixu, Deye, Basengreen that talk to Victron natively via CANbus.
Where do you live? Are there any restrictions for the grid? Like no feed-in.. Do you have 120 volt grid?
You better off by selling your solar inverter and use all Victron gear, maybe the Multi RS 6000 with built-in solar inverter, if this inverter is allowed to connect with the grid in your country.
@JayKiwi Key question is whether your existing PV will be on the input or output side of the storage inverter with the latter having the benefit of operating during power outages depending on your local ant-islanding regulations in this regard. The latter could be more complex as there is the factor one rule which in your case will result in a large inverter etc. and other potential challenges. Otherwise, using ACIN only it is a matter of sizing the inverter for the loads it has to serve and ensuring an adequate sized battery bank. Over simplified, you already have PV and need an inverter with batteries and an energy meter upstream of the PV and loads so the system knows when to charge using excess exported solar and discharge when there is not enough solar. A second PV meter is adviseable so you can have eyes on the PV production.
There are a whole lot of free training on you tube by victron.
There is training on Victron professional. For ac coupling there is mainy fronius videos but the principles are the same.