Hi, I built my lithium system like this except the shunt:
Now wondering where to connect my loads (fridge, lights, etc) to be able to switch them off when the battery is depleted. Before I used the load output of the mppt but having it wired to the bms it will turn off when the battery is full, isn’t it?
What device would be needed? Can this be done with a smart shunt just between my fuse box and the negative side of the battery?
Thanks!
Have a look in section 3.3 of the manual.
This includes diagrams for loads such as fridges and lights through a Smart Battery Protect controlled from the ATD output on the BMS.
It also gives info on the use of a VE Bus inverter.
You have obviously been in that section because that is where your diagram comes from, just read the rest of the section.
Note, you can not put inverters on Battery Protect devices, look at the manual for the Battery Protect for that info, they need to be controlled via remote on/off from the ATD port on the BMS.
Thanks for the quick reply. Will buy a smart battery protect then.
It’s a shame inverters can’t be disconnected this way. The remote off is already wired up to a switch as the inverter is rarely used. I guess I will have to disassemble the internal switch and rewire it, or is there an option to have it controlled by the bms and a switch. So the inverter turns off on low battery but I can still switch it remotely?
Thanks!
You can connect the output from a Smart Battery Protect (SBP) as a remote signal for controlling an inverter depending on the inverter configuration. See the Battery Protect manual, I think it says something about this. You could use the 12V positive after the SBP to switch a relay if the inverter only needs dry contacts (a switch without any voltage).
Hi, wanted to report how i solved it after adding in a BatterProtect and the SmartShunt:
Connected the load disconnect from the BMS to my old switch and from there the BatterProtect H pin. From the switch I went to my old toggle switch for the inverter which then runs to the inverter H pin.
So now i have the best of both worlds, can turn all my appliances off as well have it disconnected if the BMS sees fit.
Thanks for the support!
Tried to clean up the wires as good as possible, sadly can’t reduce the length of the non-inverting cable to the MPPT:
Pleased you have got it sorted.
