connecting mppt/inverter to bms/lipo3.2v batt

robocop

Hi
changing now to llpo batt pack  16s 48v  300ah with daly bms16s 250a and balancer.

Got some illustration to connect all wires to each batteries.

But now am confused how to connect from my mppt controller and power inverter to the bms/batteries.

using a mppt 60a and 4kw power inverter.

Hoping I have been clear.

thnks in advance

Bob 

BB.

My first question is EXACTLY (links?) BMS do you have? There are many variations--But what I am questioning at the moment is does this BMS have FETS (transistors/switches) at the battery negative (or other) terminals?

When you say 250 Amp balancer, it sounds like the BMS system can measure battery bus current and should have the ability to "turn off" the battery bank if cell voltage(s) are out of range (more or more cells too high/too low of voltage) or if there is too high of current through the battery bank/string. This (these) switch(es) are (more or less) the last "fail safe" for the battery bank (prevent cell damage, over heating, etc.).

Once you figure out the BMS/Battery bank wiring/... Then it should be the typical connect the + battery to your + bus bar... And the negative battery terminal to the (nice to have) large current shunt/precision resistor (to measure current into/out of the battery bank (usually connected to a Battery Monitor to estimate current/time (i.e., amps*time = Amp*Hours in/out of battery). You may not need/have the precision resistor if your BMS does the State of Charge/battery current monitoring/reporting for you.

https://www.solar-electric.com/catalogsearch/result/?q=shunt (various shunt types)
https://www.solar-electric.com/victron-energy-bmv-712-smart-battery-monitor.html (example of a standalone battery monitor--Very nice one)
https://www.amazon.com/battery-monitor/s?k=battery+monitor (examples of less expensive standalone battery monitors--Read Specs carefully--Not all have the "same functions").

Once you have the "48 volt Bus"--Then the MPPT charge controller, inverter, etc. are connected as usual...

For safety, each + terminal to bus bar should have a fuse/circuit breaker rated for maximum wiring current to prevent a short circuit starting a wiring fire. And, ideally, the + battery to bus bar should have a 250-300 Amp fuse/breaker/cabling too.

Review the manuals for your Charge Controller, Inverter, etc.... There are lots of variations and configurations (from inverter only to inverter-charger to inverter-charger-solar charger-generator controller, etc.)... 

Details matter here (both for function, and safety).

-Bill

robocop

Hi Bill
aboiut the daly bms  it s the one with a fan inbuild  16s discharge current  250a  charge current 125a using a balancer together with.

thnks

Bob

BB.

This from the Daly website:

https://www.dalybms.com/8s-bms-wiring-tutorial/

Does this help?

Note the single line connections at upper right to Motor/loads/Charger are actually + and - heavy wiring (and possibly a pair of bus bars for all the "T" connections.

-Bill

robocop

Bill thnks again