PV CONNECTION

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djmoase

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I have installed a hybrid solar inverter 24v 3kva and 2 x 200ah gel batteries following your advice. The inverter has a 50A PWM solar charger.

I need to buy pv panels so I can connect them to the system. How many panels should I buy? Do I connect them in series or parallel?

Please help me with the sizes.. See attached pdf file.
 

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djmoase said:
I have installed a hybrid solar inverter 24v 3kva and 2 x 200ah gel batteries following your advice. The inverter has a 50A PWM solar charger.

I need to buy pv panels so I can connect them to the system. How many panels should I buy? Do I connect them in series or parallel?

Please help me with the sizes.. See attached pdf file.
Click to expand...
What's your inverter model? We need to first determine the Max PV power, or do you know how much it is? Post a link to the inverter model if you can.
 
Images
 

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Why didn't you a pay a little more for an MPPT model?

That's the typical rebranded Axpert you've got there.
 
They have already done the calculations for you, since yours is a 3kVA you check under the 2/3kVA, they say you can have only one 260W panel of that spec in series or 6 of them if you connect them in parallel.

What you need to consider is the voltage operating range for your inverter which is 30 to 32V, your panel voltage should be within that, the 260W panel they recommend has a Vmp of 30.9V, so you have no choice but to only connect one in series, to stay within the voltage range but if you are connecting in parallel the voltage remains the same at 30.9V and you just have to consider the max current of the solar charger which will add, 8.42 times 6.

Hopes it make sense.
 
thechamp said:
They have already done the calculations for you, since yours is a 3kVA you check under the 2/3kVA, they say you can have only one 260W panel of that spec in series or 6 of them if you connect them in parallel.

What you need to consider is the voltage operating range for your inverter which is 30 to 32V, your panel voltage should be within that, the 260W panel they recommend has a Vmp of 30.9V, so you have no choice but to only connect one in series, to stay within the voltage range but if you are connecting in parallel the voltage remains the same at 30.9V and you just have to consider the max current of the solar charger which will add, 8.42 times 6.

Hopes it make sense.
Click to expand...

It does make sense now. I got confused because of the panels that my local dealer have. Thank you!
 

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In your case you would never have to worry about exceeding the Voc because of the very narrow Vmp range of the inverter. For camparison look at the specs of a similar sized but MPPT inverter.

Solar Charger & AC Charger
Click to expand...
  • Maximum PV Array Power: 600 W.
  • MPPT Range @ Operating Voltage: 30 VDC - 66 VDC.
  • Maximum PV Array Open Circuit Voltage: 75 VDC.
  • Maximum Solar Charge Current: 25 A.
  • Maximum AC Charge Current: 30 A.
  • Maximum Charge Current: 30 A (AC charger and solar charger can't work at the same time.)
  • Maximum Efficiency: 98%.
  • Standby Power Consumption: 2 W.
Click to expand...
 
thechamp said:
In your case you would never have to worry about exceeding the Voc because of the very narrow Vmp range of the inverter. For camparison look at the specs of a similar sized but MPPT inverter.

Click to expand...
You're a star.
 
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