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chrisco avatar image
chrisco asked

Shutdown for 3 seconds if grid fails South Africa

Good day you all. Im from south africa. Have a multiplus 12/1200/50-16 and want to ask a question. Loadshedding times when the grid fails the inverter shutoff for 3 seconds and then go back on and stay on normally but do not always shutdown. Sometimes the inverter switch to inverter mode very quickly without intteruption. Is every 3rd or 4th loadshedding when it shutdown for 3 seconds and then back on. Only when grid fail. It is not brown out because I put it self off by the circuit breaker to test. And not overload because we do not use alot on the inverter.

Do have a Lithium Battery built in BMS 188AH

Nominal Capacity (Ah)

188

Total Energy Capacity (kWh)

2.400

Energy, 80% DoD (kWh)

1.920

Standard Charge Current (A)

70

Max Charge Current (A)

125

Charge V bulk absorption (VDC)

14.1

Charge V float (VDC)

14

Recommended constant discharge (A)

100

Max. Discharge Current (A)

125

Discharge Cut-off Voltage

12V@0.005C

BMS (Charge/Discharge)

125A/125A

Op.Temp Charge/Discharge

0° to 45°C / 0° to 55°C

Protection

125A SP Circuit breaker

Minimal Cycle Life

4000 cycles @0.5C 80% DoD

I hope You guys can help me with the problem.

Multiplus-II
7 comments
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Alexandra avatar image Alexandra ♦ commented ·

Can the battery take the sudden inrush / surge when going off-grid?

I have also seen sometimes when the system is caught (since it synchronises to grid) right where the sine wave passes through zero there can be a hiccup in switching over.

Do you have the SA grid code selected?

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chrisco avatar image chrisco Alexandra ♦ commented ·

yes I think so, because sometimes I have like 40 DC Amps load then the inverter switch quickly over to inverter mode without interruption and sometimes inverter shutoff for 3 seconds and then turn back on by itself and stays on

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chrisco avatar image chrisco Alexandra ♦ commented ·
There is no option for South Africa grid and I have the newest firmware
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Alexandra avatar image Alexandra ♦ chrisco commented ·
Do you have ups marked as an option then? What are the cut off voltages?
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chrisco avatar image chrisco Alexandra ♦ commented ·
Cut off voltage is on 10V and yes have the UPS Funtion on. And the AC Input low is 195V
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chrisco avatar image chrisco Alexandra ♦ commented ·

img-4236.png

Dont know what that means? I did take the photo a month ago or so

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img-4236.png (3.6 MiB)
chrisco avatar image chrisco Alexandra ♦ commented ·
Will a Auto Transfer Switch help with this problem?
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1 Answer
chrisco avatar image
chrisco answered ·

yes I think so, because sometimes I have like 40 DC Amps load then the inverter switch quickly over to inverter mode without interruption and sometimes inverter shutoff for 3 seconds and then turn back on by itself and stays on

2 |3000

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