Upgrading an electric panel involves either replacing your existing panel with either a larger one or an outdated one. This can otten times include the addition of a secondary sub panel to accommodate or delegate additional devices or appliances.

An electrical service upgrade increases the amount of electricity (amperage) your business or residence can handle. Some common examples are 100A to 200A or 400A to 800A, which typically requires a new meter cabinet and new lines pulled from the utility.

A transformer is a type of electrical equipment that reduces or alternates the voltage. Necessary transformer upgrades are often required when interconnecting large solar installations to the utility grid. Transformers can it can be leveraged in a small commercial installation when the inverters voltage rating is different from the service, 208v to 240v, for example.

Underground electrical is a necessity for any ground mounted solar installation. Trenching is often used for shorter electrical runs and directional boring is common for longer distances.

The National Electric Code updates their code book on a regular basis, so it's not uncommon to require some minor electrical upgrades during a solar installation. Some common examples are service disconnects, ground rods, water pipes, smoke alarms, bonding jumpers, and updating/replacing outdated equipment.