{"title":"MC4 2-to-1 Adapters","description":"\u003cp\u003eTwo panels can be wired in series or in parallel, and on a 12V system the choice matters more for shade than for anything else.\u003c\/p\u003e\u003cp\u003eIn series the panels share a current path, so a shadow across one pulls the pair down together. In parallel, a shaded panel gives up more of its own contribution and less of the other's. How much depends on the panels' bypass diodes, how the shadow falls and how hard the sun is; parallel reduces the shade penalty on a roof that catches an awning arm or a tent edge every afternoon, it does not remove it.\u003c\/p\u003e\u003cp\u003eParallel also keeps the array voltage where a 12V controller expects it. Two 200W panels in parallel present about the same voltage as one and twice the current. Whether that array is allowed is set by the controller: check its maximum PV input voltage, its rated charge current and its maximum PV power against the array, and check the battery it is set up for. Matching the system voltage on its own does not settle it.\u003c\/p\u003e\u003cp\u003eAn MC4 branch connector is what makes it tidy. Two positives in, one positive out, and the same on the negative side, sealed and rated to live on the roof rather than needing a junction box built around it.\u003c\/p\u003e\u003cp\u003eOne thing to size correctly. The single lead after the branch now carries both panels, so it needs to be rated for the combined current rather than for one panel on its own.\u003c\/p\u003e","products":[{"product_id":"roam-gear-solar-mc4-2-to-1-adaptors-pair","title":"Roam Gear Solar MC4 2-to-1 Adaptors (Pair)","description":"\u003cp\u003eFor joining two solar panels in parallel into one MC4 lead. The pair covers both the positive and negative side. Before combining panels, check the total current stays within your charge controller's input rating.\u003c\/p\u003e","brand":"Roam Gear","offers":[{"title":"Default Title","offer_id":42628259479724,"sku":"RG-MC42TO1","price":19.99,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/1129\/9500\/files\/roam-gear-solar-mc4-2-to-1-adaptors-pair.webp?v=1710996959"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/1129\/9500\/collections\/roam-gear-solar-mc4-2-to-1-adaptors-pair-horizontal_02758cbf-e58a-4d53-a9a7-979011e2476d.webp?v=1741686596","url":"https:\/\/roamgear.com.au\/collections\/mc4-2-to-1-adapters.oembed","provider":"Roam Gear","version":"1.0","type":"link"}