Solar Diodes, Shading, and the 125% Rule (With Dexter from Current Connected)

This episode of Unplugged Live turns into a full-on solar classroom as Dexter from Current Connected walks through one of the most misunderstood topics in DIY solar: diodes, shading, and overcurrent protection.

With real examples, live questions, and audience interaction, Dexter explains how bypass diodes actually behave, why the 125% rule exists, and what really happens when panels are shaded by snow, trees, or even bird droppings. The conversation moves beyond theory into the kinds of mistakes that cause melted combiners, tripped breakers, and underperforming arrays.

The live audience plays a big role, asking sharp questions and sharing real-world data that help reinforce the lessons.

Topics covered:

• What bypass diodes really do inside a solar panel

• When (and when not) to use blocking diodes

• The truth behind the 125% rule

• Parallel vs series strings under shading

• MPPT behavior during partial shading

• Snow, cold weather, and edge-of-cloud gains

• Why cheap components cause expensive failures

• Tools that help visualize shading before you build

If you’ve ever been confused about fusing, shading, or array design, this episode is one you’ll want to revisit.