Dear All, First of all thanks for this forum and the software created. I am a reasonable techie, but not in the field of ems. I have a number of solar panels with normal inverters. Now my question is, is there somewhere an advice for the hardware that I can use. Especially the batteries I am very curious about, those that work with openems? Is there a list or something? And should more be added to convert a “normal” system to a battery based system? I want to create an independent system, not for variable delivery costs, but store the excess power in a battery and use it in the house for times without pv. Are there any dutchies here?
Chatgpt, give me this advice: Standard MultiPlus‑II 48/5000 is single-phase: you have one phase (L), neutral (N) and earth (PE).
If you want to work three-phase, you have the following options:
Three single-phase MultiPlus in parallel
You mount three identical MultiPlus‑IIs, each on its own phase.
Advantages: modular, you can switch per phase.
Disadvantage: slightly more complex in design and costs approximately 3×.
Victron Quattro 3-phase
This is a 3-phase inverter/charger in one housing.
For example: Quattro 48/5000/70-50 3-phase.
It has outputs L1, L2, L3, N, PE and can supply up to ~5kVA continuously per phase.
Less cabling and one device.
Victron MultiPlus-II 3‑phase variant
Victron sometimes offers a 3‑phase MultiPlus‑II in one unit, but that is less common than the Quattro.
Recommended configuration for 3‑phase
Component Model Note
Three‑phase inverter Victron Quattro 48/5000/70‑50 3‑phase Single unit, 3×5kVA
Battery bank Pylontech US3000C ×3 10.5kWh, 48V DC
DC wiring 2×70mm² flex, M10 lugs Charge/discharge max ~100A
AC wiring 5‑core + PE, 6mm² per core L1, L2, L3, N, PE – fuse per phase 16–25A
Group in distribution board 3× Circuit breaker (B characteristic) One circuit breaker per phase for Quattro output
mermaid
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flowchart LR
BATT[Pylontech US3000C ×3]
Quat[Victron Quattro
48V/5000VA/70‑50 3‑phase]
GK[Distribution box]
Net[Net / Grid]
BATT —|DC| Quat
Net —|3×AC| Quat
Quat —|L1,L2,L3,N,PE| GK
DC side: battery bank → Quattro.
AC side: Quattro feeds all three phases in your distribution box.
Mains input (for charging) also goes via Quattro.
Practical tips
Fuses/DC fuse: place a suitable battery fuse (e.g. 125A) close to the battery.
Cable sizes: check continuous current and distance; 70mm² is common for ~100A.
RCD: in your distribution box, each phase must be protected by 30mA types.
Synchronization: Quattro automatically synchronizes its output with the grid (phase, frequency).
With this 3-phase setup, you can distribute larger capacities without any problems, and you have one AC connection (via Quattro) instead of three separate single-phase units.
Certainly the system with best OpenEMS compatibility is the “FENECON Home”. FENECON is one of the founders and core contributors of OpenEMS: FENECON | Home 6, 10 & 15 - Heimspeicher
My second best choice for compatibility would be a GoodWe Battery Inverter with a compatible battery.
Regards,
Stefan
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