Hi,
I live in the Netherlands. I have a 3 * 25A connection to the grid. I want to make a 3 phase system with these components:
3 * Victron MultiPlus-II 48/5000/70-50
1 * Victron Lynx distributor
1 * Victron Cerbo GX
1 * Victron GX Touch 50
1 * holder for Victron GX Touch 50
3 * Basen green 16S 314Ah batteries
I have a few questions:
Where should I use fuses? I am planning to fuse each battery connected to the victrons. But what fuses should I use? The Mulitplus II is 5000W, so what fuse should I use? If 5000W is the max. what is the calculation for the fuse? P=UI. I want to go to use the range 15% up to 85% SoC. Voltage 20% SoC is 51.2V and 10% is 48V. so 15% is probably (51.2+48)/2=49,6V. 5000W/49.6=100.8A. So should I use a 110A fuse? Or can you give me some advise?
What fuses should I use for in the fuse box? There are 25A fuses before the meter of the electricity company. Should I use a 320A and 50mA (B or C?) earth leakage circuit breaker. Just behind the main switch and SDM630?
I will connect the battery connectiosn of the multiplus devices to each other. How can I connect these devices battery connection to each other? I was planning to make a wire from multiplus 1 to multiplus2, mulitplus 2 to multiplus3, multiplus 2 to battery1. So 3 connections on multiplus 2. Does that fit or should I connect that in another way. I am using 95mm2 wire to connect the batteries. With SC95-8 connections. Victron told me to use cables with max amperage divided to 3. 15000/50=300A. 300/3=100mm2. So 95mm2 should be good. Should I also put a fuse between the multiplus connection that goes to the battery? I don’t think I can connect 3 connection to the multiplus 2? Should I the power in from Victron? Is that not just a very expensive bus bar?
I will use DMX cable to connect the communication lines of the VE bus. I can use the software of the basen green battery housing to limit the voltage up to where battery is charged and is being discharged. Or shouldn’t I do that and let the Victron handle the upper and lower battery limit? I don’t want to use the lower 15% and upper 15%.
This my first system. I am hardware design engineer. So I know something about electronics. Any help or advise is appreciated.
Thanks in advance.
Beste regards,
Mark