Connectors, including MC4 connectors and MC4-compatible connectors, can be purchased from various sources. Here are a few options where you can buy these connectors:

1.Solar Equipment Suppliers: Many suppliers specialize in providing solar equipment and components, including connectors. They offer a wide range of products specifically designed for solar installations. Some well-known solar equipment suppliers include:
Solar distributors and wholesalers: These companies supply solar components to installers and contractors. Examples include SolarEdge, SMA Solar, and ABB.
Online solar equipment retailers: Websites like Solar Electric Supply, Wholesale Solar, and altE Store offer a variety of solar components, including connectors.

2.Electrical Supply Stores: Local electrical supply stores may carry connectors suitable for solar installations. These stores typically stock a range of electrical components and may have MC4 connectors or compatible alternatives available.

3.Online Marketplaces: Online marketplaces provide a convenient platform to search for and purchase connectors. Some popular options include:
Amazon: The online retailer offers a wide selection of MC4 connectors and other solar components from various sellers.
eBay: eBay is another platform where you can find a range of connectors, including MC4 connectors, from different sellers.
Alibaba: If you are looking for bulk purchases or sourcing directly from manufacturers, Alibaba is a platform that connects buyers with suppliers.

4.Local Solar Installers and Contractors: Local solar installers and contractors often have access to a variety of solar components, including connectors. They may be able to provide or recommend a reliable source for connectors.

When purchasing connectors, ensure that they are genuine, high-quality products from reputable manufacturers. It’s important to select connectors that meet the necessary electrical and safety standards to ensure the reliability and longevity of your solar installation.