I can read the maximum from the Victron docs, but what is the minimum number of 51,2 Victron NG batteries for a 3-phase Multiplus II 5000/48 setup?
Loads will typically be around half of the capacity of each Multiplus, but headroom up to near 4000W per phase would be nice to know also.
Specs say 100A continuous so an initial guess would suggest 3 batteries will start and work, and I assume the Lynx BMS will help with inrush/precharge ?
Do we know if a Lynx BMS will handle startup 3x MP 5000/48 from 3x 51,2 NG batteries?
Will need to buy them in batches of three and probably aiming for a total of 10 if we can afford it
over a few years if we go this route so I am asking if there is a way to start small-ish with these batteries and build?
We can probably manage loads carefully if needed. Any help appreciated.
Depends on what you define as the goalpost for minimal. If its rated output power, then:
The combined rated output power of 3x MP2 48/5000 is 12kW, since they are rated 5kVA/4kW, so your proposed “up to 5kW” is already overload
The rated discharge current of the 51.2V NG batteries is 100A, this means a single battery could provide 51.2Vx100A=5.12kW
Your minimal number of batteries is therefore 12kW/5.12kW=2.34 which means your guess of three batteries would be correct.
However, this setup can only deliver that rated power for an hour, since the stored energy is 5.12kWh per battery, or 15kWh for the pack. If you draw 12kW for an hour, then 12kWh will have discharged, which is 80% DOD. If you only use half of the rated power, the time will double.
Thats where your definition comes into play. Does this capacity work for your load profile? Three batteries are enough when simply looking at the power, so yes, you can start with that.
Yes, that would work for us in terms of our typical loads. I am realistic and have spent a lot of time with even
smaller systems off-grid to keep an eye on SOC, current loads and future expected PV.
So can I assume that the 3x 51,2 NG batteries will also simply allow the restart of the 3x Multiplus 5000/48 for example
at night after som kind of failure when there is no solar for precharge?
I am new to the Lynx BMS but it states in the datasheet:
“ Pre-charge circuit
Prevents high inrush currents when connecting capacitive loads like inverters.
Eliminates the need for external pre-charging devices.”
Do we know if a Lynx BMS will handle startup 3x MP 5000/48 from 3x 51,2 NG batteries?
No, not bought the system yet. Everything pretty much decided except batteries and accompanying BMS.
Want reliability and safety from batteries in these strange times and Victron integration with batteries looks very robust to me.
Have had some bad experiences with 3d party LiFePo batteries in integration with Victron.
Never owned Victron batteries and interested in giving it a go if we can afford it.
Thanks for that tip, looks interesting. Are you using it with Victron Multiplus 3-phase?
Very nice setup at that link. Kudos!
It does not mention any NKON ESS Pro batteries as far as I can tell?
Have you used or tested any with 3x MP by any chance?
Correct, I have GobelPower GP-SR1 with PACE 2000 BMS.
NKOn is cheaper, same/better quality depending on selected components and has a fire extinguishing system build in.
A good source about Chinees BMSes is Andis Offgrid Garage in YouTube.
The major Victron compatible BMSes are JK, Seplos, PACE and put into most batteries.
There many users using those BMSes. I am happy with my PACE 200, know the limits and how to circumvent.
NKON has Seplos BMS, JK active balancer and EVE grad A MB31 cells.
According GobelPower, Victron refuses to add further battery suppliers to the compatibility list. I haven’t cross checked the statement.
Do you happen to know how deep and wide the CANbus support for Seplos BMS is when connected to Victron?
Can we see individual cell states, hi/lo voltages and temps? In VRM ? In Node Red?
The specs/price for the NKON ESS Pr stuff that you suggested is pretty promising..
Thanks, have had a bad experience with Pylontech but I know many people swear by them and have years of trouble-free use so they are still on my list.
Seems to be some lemons in their batches also and their kWh price is not the lowest either, so looking around.
In this Forum there are many bad experiences especially with old version not delivering cell information. Furthermore Pylontechbis 15s.
An 16s alternative is Pytes.