Hi! I’m planning to upgrade from 2 to 3 Pylontech US5000 units/ batteries, and I’d like some advice on the best way to connect them.
For now, the two that are already running, are running in parallel, conected on only one terminal (out of four) of the Lynx Distributor/ busbar.
Option 1 (diagram 1): use two end-runs (one on each terminal pair) and have a 200A output through the two available terminals on the Lynx Distributor (the other two slots are already used by the MPPT and the MultiPlus II).
Option 2 (diagram 2): connect all 3 batteries in parallel and use only a 100A output, so only one position on the Lynx Distributor busbar is occupied.
I have a single Multiplus II 48V 5000VA inverter (70-50). I usually draw no more than 80A at 48V from the batteries, and only for short periods, since my loads are generally small. Since the inverter has a continuous output power of 4000W at 25°C, that works out to roughly 89A at 48V DC, so it seems to remain within the 100A limit of the 3 batteries in parallel.
I’m open to suggestions and would really appreciate your thoughts. Thank you!
Please check cable size and plug.
But with one MP2 5K and no MPPTs one cable with 50qmm should be enough. Sometimes those batteries are delivered with 25qmm or 35qmm cables. Then use two.
Thanks, Nick. I understand that wiring all 3 batteries separately to the Lynx would be the preferred option. As I already mentioned, the issue is that I don’t have 3 free Lynx positions available (two are already used by the MPPT and the MultiPlus II), so I’m trying to find the best solution with only 2 battery positions left.
Option 1 would be the best than, but not ideal. Installing a Lynx Power-in would be a better solution, or add a 4th Pylontech so you can make 2 parallel connections
It would be best if you bought an additional Lynx Power-In and connected the batteries to it independently.
If that’s not an option, connect all three batteries together first, and then hook up the first and the last one directly to the Lynx using separate pairs of positive and negative cables.
So, if I understand correctly, you consider Diagram 2 (100A output) to be the best option for now, without upgrading the setup with an additional Lynx Power In for now. If so, could you explain why, please? I think @vaursechs is saying the exact opposite.
You are forgetting that a lynx distributor has 6 (six) connections…
4 normal and you can also use the end ones.
As long as the batteries are designed to be wired together in parallel without fusing, then you can put 2 of them on the ends of the distributor and then you have the 4 fused positions for: 1 x MP2, 1 x MPPT and still remains 2 fused positions where you can put another 2 batteries.
I did a similar upgrade and just bolted both Pylontech cables straight to two M8 lugs on Quattro 5000.
Previously, I had one lug for Pylontech (2 batteries - voltage sag under load, but took care not to load too much) and second lug for MPPT on my temporary setup.
But now I want to add 1 or 2 MPPTs and promote it to a permanent installation, so I bought a Distributor, and I’m thinking 208A (peak Quattro power) deserves some good connection from side M10 lugs to the inverter.
I don’t think it’s possible to crimp a M8 on 70 mm2 cable, and crimping 2x M8-M10 35 mm2 short cable pairs and fitting them around both sides of protruding Lynx bars seems like the only viable option. Could probably get away with single pair of very short 50 mm2 cables too, but M8 connection to Quattro becomes a weak point.
I’m really surprized it’s impossible to find a block of metal that fits straight from Lynx into Quattro/MultiPlus.
Does anyone know if those can be ordered somewhere as custom? Do I have to make those myself?
Yes, I know both PowerIn and Distributor were not originally meant to be used like this (but everyone seems to be doing it anyway), and inverter usually just goes on one of the M8s inside.
