In uncertain times

Interesting article. Whereas it has been written about the Australian market, it is just as relevant to NZ.

It essentially covers how having solar power with storage capabilities will come to the fore as we forge on to a new way of life amidst the Covid-19 pandemic.

Read the article here

Cancelled Taranaki Home & Lifestyle Expo show special.

Purchase any solar package for installation in April & May and be in to win your installation back. Offer does not apply to any other special, past or current. (Some other t’s & ‘s apply, but not many)

PLUS, some other free stuff.

Any qualifying package will see you receive every 4th panel free. That can add up to some great savings, so if you are thinking solar, it has never been a better time to get underway.

Call now on 0800 PV SOLAR (0800 787 652)

Or get started here with our design form

Design Form

 

 

We have created a simple to use form to help us design a system for you. Complete the form and we will be able to ascertain;

  • System size to suit your individual circumstances
  • What power savings could be achieved
  • Your return on investment (cost to savings ratio)
  • Annual savings based on power price increases
  • How much carbon you WILL eliminate from the atmosphere over the life of the system

Click here to get started

Every 4th panel FREE

Purchase a new solar power system for installation in March and receive this special offer;

8 panels, only pay for 6.
12 panels, only pay for 9
16 panels, only pay for 12 etc

To inquire more about this offer
Call us today on 0800 PV SOLAR (0800 787 652)

Panel Capacity

 

 

 

 

 

 

We are often asked “How many panels can I have in relation to an inverter size?”

A: There is a limit to how many PV panels can be connected to a string inverter. Not all inverters are crated equal in what DC input capacity they can handle. Also, the number of strings comes into play.

For the sake of this exercise, lets assume a system with 1 string to a central 3kw string inverter.

Whereas some specs relate to wattage, the more accurate measure is the total voltage the panels supply to the inverter.

Lets look at a typical 3 kw inverter.

Max DC input power (to the inverter) 600v (volts)

If we were to install the Trina 235 w Honey Black module (panel) which has an open circuit voltage of 40.4, we could connect 14 panels

Total voltage = Voltage (V) ea panel  x No of panels = max voltage to inverter.

In this case

40.4 x 14 = 565v.

 

Solar panel efficiency

You may have heard of, or seen, solar panel efficiency advertised by module(panel) manufacturers. Here, I will explain its meaning and how the value comes about.

Solar panel efficiency is expressed as a percentage (%) and relates to how much energy is converted when light from the sun reaches solar panels.

The sun creates light energy, which when exposed to PV (photo voltaic) cells is converted to DC (direct current) energy. When this conversion occurs, energy is lost in the process.

Light energy from the sun, at peak, creates 1,000 watts of power per m2. Most LAM (large area module) panels, the like of which most residential & commercial panels are, measure approx 1.65 – 1.7m high & 1m wide, so approx 1.65 – 1.7 m2.

So, light energy created equals approx 1,700w of energy on the solar panel (1.7kw). If say, a panels efficiency (the rate at which it converts) is 19.9% then the panel produces (at peak) 338w. This is the measurement in which most panels are marketed.

Inverter types

There are 2 main types of inverter systems

 

String inverters.
This is where the solar panels are “strung” together by connectors & cables, leading to a central inverter, usually situated in a garage or other safe place. Some inverters can be secured on outside cladding or other area close to house. Be aware though, they should not be placed on a northerly aspect,                                   as they don’t like too much heat.

 

 

 

Micro inverters.
these are small inverters that are placed on the back of panels. They convert the DC power created by the panels to AC directly at the source (the panel). Then linked to a smaller “brain” that replaces the central inverter.

 

Both have their place in a PV solar power system. A string inverter system is generally less expensive than a micro system, but have limitations. You can have a maximum of 2 different arrays (East/West e.g.) & if shading is a problem, the panels can be less effective.

With micros, you can have panels on 3 or more arrays, so Nth, East,West (even South for that matter), shading is not an issue as the panels convert to AC individually. Also, micros have better performance reporting capabilities.