Can you add more panels to your current solar system?

How easy is it to add more panels to my existing solar system?

Have you have recently transitioned to a solar-powered lifestyle  via the purchase of a new home with a small solar system? Have you been a solar system and panel enthusiast for years? The ever-evolving need for more energy often nudges us towards  exploring how to expand our existing solar system setups. The idea of adding more panels or even integrating a battery into your solar array starts brewing in your mind. But, how straightforward is this process?

Not as easy at it looks

Unfortunately, expanding your solar system isn’t as simple as tossing some extra panel pieces into the mix. It’s akin to renovating a house – sometimes it’s easier to build a new one than adding bits and pieces to the existing structure. But do not despair, with the right guidance and a seasoned quality solar installer by your side, navigating through this process can be achieved.

As you entertain the idea of adding more panels, it’s crucial to take a trip down memory lane to when your original panels were installed. Solar system technology and regulations have evolved over the years. and the Australian Standard has changed every few years. Particularly, if your solar system dates back to between 2007 and 2013, you might find yourself in a bit of a pickle. The technology from that era, although still functional, doesn’t always play well with modern solar system equipment, owing to updated technical standards. This means expanding the existing system might hit some hard roadblocks.

What are my options?

There’s a silver lining. One way around this is to install an entirely new system with modern panels alongside your old system. It might not merge into a singular entity, but you’d have two independent power-producing systems supporting you home’s energy consumption. However, aesthetics could take a hit with two distinctly different PV systems on your roof. If your original system is over 10 years old and relatively small, professional installers often suggest starting fresh with a large modern solar array. It looks better and is technically a safer system.

Microinverters makes expanding a breeze

Now, let’s look at technical compatibility. If your solar journey began with microinverters and your system is relatively new (less than 5 years old), expanding it is a breeze. The integration of newer watt class panels and more microinverters is a fairly straightforward task.

On the other hand, if a string inverter is what you have, you may need to upgrade your inverter as you expand your system. The intricacies lie in the technical capacity of your inverter and the evolving technical standards. A good starting point is to contact the manufacturer of your inverter or consult with a local installer to understand the capacity constraints and the compatibility of adding more panels.

Now, shifting gears to battery integration – the concept might seem simple, but it requires a good deal of technical assessment. Before jumping onto the battery bandwagon, it’s essential to evaluate the electricity production of your existing solar system setup to ascertain whether it’s substantial enough to charge the battery year-round, especially during the less productive winter months.

For instance, eyeing a Tesla Powerwall? Ensure your solar system can export around 15 kWh of electricity daily during winter to keep that Powerwall adequately charged. However, if your solar system’s output falls short, do not despair. There are numerous smaller and modular battery solutions from other brands such as Sungrow or BYD tailored to fit varying solar outputs.

The bottom line? Expanding your solar system isn’t a one-size-fits-all scenario. It’s about meticulously understanding your existing setup, your energy needs, and aligning them with the evolving solar technology landscape. This process which is known as solar system expansion or upsizing can be successful if you follow this step by step path:

1. Check local regulations 

• Before planning an expansion, it’s essential to understand the local regulations and standard required for modifying your existing solar system. This very much depends on the age of your system.

2. Assess your current PV system and your roof space

• Assess the size and capacity of your existing system to determine how many additional panels you might need. Also check out your roof to determine how many additional panels you might be able to fit. We have produced a great video to help you work out how to do this.
• Maybe contact the original installer (if available) for an evaluation, or seek a new local solar company to assess the current system’s conditions and suitability for expansion.

3. Inverter technology & capacity:

• Check the capacity of your existing inverter to see if it can handle the additional power from the new panels.
• If not, you might need to upgrade your inverter or add an additional inverter to handle the increased capacity.

4. Electrical compatibility

• Ensure that the additional solar panels are compatible with your existing inverter and other system components. If the watt class is very different then you might have to put all the new panels on a separate string, or in some cases – it will just not be possible. Then you might have to find 2nd hand panels of a similar wattage to the ones you had originally. The panels don’t have to be the same brand or model as the original panels, but they should have similar electrical characteristics (like voltage and current ratings).

But if your system is a bit older – as mentioned before – due to install standard changes, you just can not touch the old system in anyway for any upgrade. It’s economically just not worth it – and it’s better to get another system next to the exiting or start from scratch. Maybe best to get professional advice form a local quality focused solar installer.