How to connect Solar Panels to EG4 Mini Split

Today, we’re diving into the exciting project of connecting the EG4 mini split to solar panels. We’ve had quite a few requests on how to do this, so we’re kicking things off and taking you through each step. Trust me, it’s going to be super straightforward!

The article below is a good overview but I encourage you to watch the video above for a more detailed walkthrough.

Disclaimer: I am not an electrician and this guide is not to be considered expert advice. Consult a certified electrician and your local codes and laws. I take no responsibility for your actions.

Everything You’ll Need

Before we begin, let’s gather all necessary items for this project:

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One important point is to read your instructions thoroughly to ensure correct wiring.

Connecting the PV Array DC Isolator

Let’s discuss the setup for the DC isolator. It might seem at first glance that connections go straight through, but you actually need to wire back to the unit correctly.

In our setup here, we’ve chosen to use watertight connections at the bottom for extra safety and kept the connections up top.

Temporary Solar Panel Trailer Setup

You might be wondering why I have my solar panels mounted on a trailer instead of a ground mount. Good question!

"I decided on a temporary trailer setup because I’ll eventually be building a deck here. For now, this truck setup is practical and lets me show you the process."

These panels are definitely on the older side — I grabbed them for just $20 a piece. If you are in the market for used solar panels, I cannot recommend SanTan Solar enough. You’ll often find that the cost of freight and shipping surpasses the price of the panels themselves.

Setting Up the Panels

Here’s what our setup looks like:

1. Panels are connected in series, starting from the first panel and connecting one to another

Measuring Voltage

Let’s use a voltmeter to ensure proper voltage levels. Turn your voltmeter to volts DC and carefully plug it into the panel system.

Place the black probe on your multimeter into the negative terminal on your solar array.
Then, place the red probe into the positive terminal from your array.

Looks like i’m getting 217 volts with some clouds in the sky.

If everything is set up properly, you will be reading the voltage correctly.

Be sure to check your user manual to see if your open circuit voltage VOC is within the minimum and maximum range for your unit.

Connecting to the Mini Split

With the wires correctly set up:

Connect the positive and negative leads to the unit
Secure all connections
Turn on the DC Isolator

During initial setup, we’re seeing around 300 watts due to cloud cover, but as the sun breaks through, we’re hitting approximately 600 watts.

Efficiency Tips and Tricks

Remember, these panels, due to their age, only put out about 100 watts each. Investing in newer panels like 420-watt units will optimize space and efficiency.

“Don’t be fooled by appearances. Spending extra on high-efficiency panels will save more space and provide better outputs.”

Conclusion

Connecting solar panels to your mini split is as simple as plug and play. With a minimal investment in older panels, you can see considerable returns.

For those interested in buying an EG4 Solar Mini-Split, click here.

Don’t forget to get $50 off anything you buy when you use “ETHSAVE50BUCKS” at Signature Solar.
Check Pricing

Thank you for joining me on this solar-powered journey. If you have any questions or need further clarification, feel free to leave a comment below.

Happy solar paneling!