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.

Premium hybrid storage system

The Storion Smile 5 hybrid storage system represents the very best in solar energy storage.

Being hybrid, it will still produce solar power in a power cut, giving you the best of both worlds in a semi off-grid situation. This enables power to essential circuits e.g. fridge/freezer, lighting and power points for an extended period.

In comparison, A/C coupled systems (e.g. the Tesla Powerwall), will only give you power until the battery has discharged, often less than 1 day.

Whats more, the price is competitive to most A/C coupled systems. Talk to us today about your energy storage needs. Call now on 0800 PV SOLAR (0800 878 652) or email solar@nakisolar.nz

New Premises

We are now located at 280 Devon St West, New Plymouth (cnr Morley St). Call in for a chat about solar, bring a recent power bill and we will design a system to suit. Lets get you started with some amazing savings that solar power can deliver.

Lepperton installation

Incorporating 20 half cut cells, monocrystalline Trina Solar modules with twin 3 .3 kw inverters, our customer will produce up to 6.6kw of solar power per hour. This will result in annual self-consumption of approx 9,600 watts, saving approx $2,500 in power costs in year 1. With the ever-increasing cost of power, these savings will increase year on year. This represents an initial return of 20% on the investment, a great financial result for our customer. On the environmental side of the coin, this system, over its lifetime, will eliminate 60 to 80 tonnes of carbon from the atmosphere. A great social result.

SOLAR MYTHBUSTERS

Who you gonna call?

I would like to bust a myth about PV solar. Was talking to someone on a lovely fine winters day recently. He said “would almost be enough heat to produce solar”.

Heat has nothing to do with PV solar. It’s all about light. As soon as there is light, PV panels produce solar power. In Taranaki we are blessed with above average NZ sunshine hours. DO you receive a monthly power bill? Concerned about ever-increasing power prices? Give us a call on 0800 PV SOLAR (0800 787 652) and lets do a free assessment on the benefits of solar for you.