7kW solar systems, once relatively uncommon, have grown in popularity in Australia as the average solar system size has increased. A 7kW solar system could be the perfect match for an ordinary household with higher-than-average electricity consumption, or for a small business with accordingly small electricity needs.

Back when Australia’s solar industry began booming around 2008, the most popular (and affordable) solar system size was 1.5 kilowatts (kW), due mainly to the high price of solar photovoltaic (PV) technology. Solar system prices have since come down considerably, however, leading to growth in average system sizes across the nation. 1.5kW systems are now a relatively unpopular choice given the proportionally greater financial benefits possible by investing in larger systems.

These days, depending on your state, the size range for a residential solar system is ordinarily between 3kW and 5kW. With 5kW being one of the most popular system sizes in the country – 7kW is only a bit above average, and not much of a stretch economically for households with a flexible budget for a solar system.

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How many panels in a 7kW solar system? How much area required?

A modern-day 7kW solar system using 250 watt (W) to 320W modules will consist of about 23-28 panels.

Each panel generally measures out to about 1.7m2, so the roof area required for a 7kW system will be about 40-48m2 – or possibly more depending on how your roof is laid out and whether you require tilt frames (which need to be spaced out more than panels mounted flush on the roof).
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Dr. Ranjith Obeyesekera 9 December, 2015 at 5:16 pm

Very useful information.thank you.

Paul J Camire 21 September, 2014 at 1:57 am

I have a company here in NH who just quoted a 7KW ground mounted system for Just over 30K, with the 30% government tax credit and $3500 of state cash back it came out to a little over 17K our cost. Our electricity bill is on average $150 a month for 12 months. I am 55 yrs old and don’t see the payback of 12yrs as being worth it. I would do all the site work – level area where pads are to be laid, cut trees, and dig trench for electrical from panels to house, and poke a hole thru my foundation for the conduit. Price seems more than excessive don’t you think?

Solar Choice Staff 23 September, 2014 at 3:09 am

Hi Paul. I can’t really comment on the situation in New Hampshire as we service the Australian market. The 7kW system at $30k works out to around $4.30 per watt–that’s definitely on the expensive end for a system of that size installed in most places in Australia. Payback periods here are more in the range of 4-7 years.

Is that the best price you’ve been able to find for your area? And I assume you’re not entertaining the idea of going with a leasing deal?

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