Hi
Please I need advice on solar panels 
I have a axpert  5kva  inverter , 3 pylontech 3.5 kw , and 12 solar panels 330 w mono crystal 
I need to know how connect the solar panels in series or parallels and how many panel per group please advice 

Thank you
 

 

1 hour ago, Kiranbhowan said:

I need to know how connect the solar panels in series or parallels and how many panel per group please

Welcome

What is the max Voltage rating of the MPPT. It's either 145 Volt or 450Volt? 

If its 145 volt you can wire 3 panels in series and 4 strings in parallel.  

If its the 450 volt MPPT you can parallel  2 strings of 6 in Series. 

17 hours ago, Jaco de Jongh said:

If its 145 volt you can wire 3 panels in series

I would recommend only 2 in series if the panels are 72-cell. If 60-cell (less common these days, but available), then use 3 in series.

Thanks for the advice , if I put 4 panels parallel will my amps and voltage change compare to putting in series 

You want to parallel strings of 3 or 2 panels, not individual panels. Each string should have its own fuse or breaker; MC4 fuses on the roof are most convenient for installation, but a nuisance if they blow (quite rare).

The current for each paralleled string, which will approach the Imp for each panel, will add. So if the panel Imp rating is say 9A, then 4 strings will provide up to 36 A, a little more briefly under rare conditions.

If you connect 2S6P instead of 3S4P, you will get the same power, via less voltage but more current.

 

This is the inverter I have , I just need to confirm if my mppt charger is 145v , please advice I am not sure 

46 minutes ago, Kiranbhowan said:

if I put 4 panels parallel will my amps and voltage change compare to putting in series 

Parallel amps add up

Series volts add up

Yes 145V

21 hours ago, Kiranbhowan said:

I just need to confirm if my mppt charger is 145v

As already mentioned, it's 145 V. The bottom line of the label specifications says so.