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Adding 5 More Panels to My Growatt Inverter – Second String Questions on Specs, Cabling & Configuration

 
Solar Photovoltaic (PV)
Last Post by David999 2 hours ago
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 David999
(@david999)
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Joined: 2 years ago
Posts: 309
Topic starter 15/04/2026 9:53 pm   [#2953]

Ordering up the materials to install another 5 panels on my garage roof. It’s a growatt sph 3600tl bl up the current panels are Canadian solar 425 x6  I hope to install another 5x 450 to the other plug thus on a separate string.  I will use a separate isolator for these but not quite sure how to do it. 

does the inverter have to be configured for these extra panels.

Do the panels have to match the specs of the ones already on the other string. 

do I have to upgrade any fuses. 

going to use boxes since it’s a flat roof and weigh them down, do they need screwed down as well.

should I use 4mm or 6mm cable.

The panels will be configured two panels and three in front. Will I have to make up an extension lead to join the forward ones to the rearmost ones.  

any other tips appreciated, I’m an engineer so electrically trained but not in solar.

many thanks in advance. 


This topic was modified 1 hour ago by Mars

   
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