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Mecer Axpert MKS II 5KW 48V 4000W MPPT - Minimum Panels required


PeanuTG
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Hi

I just bought this inverter. I see that the DC PV operating voltage is 120VDC. What is the minimum number of panels required to get the solar side working? I currently have 4 x 330watt panels.

 

Reference: MUS-SOL-I-AX-5NB

Condition: New product

Rated Power 5000VA / 5000W 
Maximum PV Array Power 4500W
MPPT Range @ Operating Voltage 120VDC~430VDC
Maximum PV Array Open Circuit Voltage 450VDC
Maximum Solar Charge Current 80A
Maximum AC Charge Current 80A
Maximum Charge Current 80A

 

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41 minutes ago, chrisyoung said:

Hi

I just bought this inverter. I see that the DC PV operating voltage is 120VDC. What is the minimum number of panels required to get the solar side working? I currently have 4 x 330watt panels.

 

Reference: MUS-SOL-I-AX-5NB

Condition: New product

Rated Power 5000VA / 5000W 
Maximum PV Array Power 4500W
MPPT Range @ Operating Voltage 120VDC~430VDC
Maximum PV Array Open Circuit Voltage 450VDC
Maximum Solar Charge Current 80A
Maximum AC Charge Current 80A
Maximum Charge Current 80A

 

Aren't most panels 32VDC nominal? 

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Good day.

Well please give us the solar panel details. model number and make 

Lets say you have 330w Canadian solar panels then the Vmp is around 37v.  3x 4= 148V all 4 panels in series you should be fine if you do not have shading. 

I think you should add 2 more in series if you can afford it 37x6= 222v

Usually the inverters with the high voltage MPPT start up voltage is  150v. 

I have noticed that my system start to charge the battery when the solar voltage is around 125v. 

330 x4= 1320 *0.8(for losses) = 1056W. 

Your inverter can handle 4500w. 330wx16x.8 = 4224w. (16x330=5280 but you will have cable losses as well as irradiance and temperature losses) 

You can have 8 panels in series and 2 strings in parallel total of 16x 330w panels 

 

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20 hours ago, chrisyoung said:

What is the minimum number of panels required to get the solar side working?

My personal observation, without ever owning one of these, is that you need 6 panels as the practical minimum. If they are 72-cell panels (as most are these days), then you might get away with 5 panels.

Edit: that's despite the fact that mathematically, it looks like 3 panels would be enough to at least get some production.

Edited by Coulomb
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