MullerEnergy-Australia
New Member
- Joined
- Dec 10, 2020
- Messages
- 95
I've sold a client 16x 272Ah Lishen batteries and when he asked me what BMS to get, I recommended that he get a 150A Daly Smart BMS.
So now he installed the Lishens, they have a voltage of around 53V, which is pretty good, however we can't get the BMS to work when the inverter is on.
To turn on the BMS, we (I say we, but he's doing everything, I'm just on facetime with him) connected B- and P-. If this is done with the inverter disconnected, the BMS turns on, however it's only showing 48V potential between P+ and P-, so 4-5V lower than between P+ and B-. I'm not sure that's right.
But once the inverter is connected, the BMS trips and P+ to P- drops to around 8V. If B- and P- is then connected, there's a big spark. The inverter a Giant Power 4000WM (the same as an MPP PIP-4048MS and a long list of other rebadged inverters).
Unfortunately the client does not have a resistor to pre-charge the inverter capacitors, as I think this could potentially be the problem.
As it's an off-grid property, he's reliant on the batteries working, so he's currently running it without the BMS, which is working fine (I told him to keep an extremely close eye on the cell voltages).
While I know I'm not really responsible, as I only supplied the cells and not the inverter or the BMS, I did recommend the BMS to him and definitely want to help him fix it. However, I think I'm somewhat out of ideas.
So if any of you know whether it's a simple user error, the inverter caps or perhaps a defective BMS, any help would be very much appreciated!
I got him to check the balance leads twice, just to make sure that wasn't the problem.
Thanks!
List of inverters that are the same as his below:
Axpert MKS 5K
Mecer (rhymes with "spacer") MKS 5K (from Mustek)
Mecer SOL-I-AX-5M, SOL-I-AX-5P and SOL-I-AX-5P64
IPS-4000WM (from Giant Power)
Effekta AX-M 5 kVA
Flinslim MPPT 5kVA
OPTI-Solar SP5000 Brilliant
MAXIC5000-48
Pro Power 48V 4000W Integrated Power System
SP5000-48MPPT80
Proline Energy inverter 5kVA 48V w/MPPT SCC
Inverex MKS 5KVA
SOLARIX PLI 5000-48 (from Steca Electronik GMBH)
Voltex MKS 5KVA
RCT Axpert 5000VA
SolarPower24 Primo MKS 5K-48, Primo MKS(PF1) 5K-48, Primo MKS(PF1) 5K-48H
So now he installed the Lishens, they have a voltage of around 53V, which is pretty good, however we can't get the BMS to work when the inverter is on.
To turn on the BMS, we (I say we, but he's doing everything, I'm just on facetime with him) connected B- and P-. If this is done with the inverter disconnected, the BMS turns on, however it's only showing 48V potential between P+ and P-, so 4-5V lower than between P+ and B-. I'm not sure that's right.
But once the inverter is connected, the BMS trips and P+ to P- drops to around 8V. If B- and P- is then connected, there's a big spark. The inverter a Giant Power 4000WM (the same as an MPP PIP-4048MS and a long list of other rebadged inverters).
Unfortunately the client does not have a resistor to pre-charge the inverter capacitors, as I think this could potentially be the problem.
As it's an off-grid property, he's reliant on the batteries working, so he's currently running it without the BMS, which is working fine (I told him to keep an extremely close eye on the cell voltages).
While I know I'm not really responsible, as I only supplied the cells and not the inverter or the BMS, I did recommend the BMS to him and definitely want to help him fix it. However, I think I'm somewhat out of ideas.
So if any of you know whether it's a simple user error, the inverter caps or perhaps a defective BMS, any help would be very much appreciated!
I got him to check the balance leads twice, just to make sure that wasn't the problem.
Thanks!
List of inverters that are the same as his below:
Axpert MKS 5K
Mecer (rhymes with "spacer") MKS 5K (from Mustek)
Mecer SOL-I-AX-5M, SOL-I-AX-5P and SOL-I-AX-5P64
IPS-4000WM (from Giant Power)
Effekta AX-M 5 kVA
Flinslim MPPT 5kVA
OPTI-Solar SP5000 Brilliant
MAXIC5000-48
Pro Power 48V 4000W Integrated Power System
SP5000-48MPPT80
Proline Energy inverter 5kVA 48V w/MPPT SCC
Inverex MKS 5KVA
SOLARIX PLI 5000-48 (from Steca Electronik GMBH)
Voltex MKS 5KVA
RCT Axpert 5000VA
SolarPower24 Primo MKS 5K-48, Primo MKS(PF1) 5K-48, Primo MKS(PF1) 5K-48H