Why couldn't the full system connect without it?

Every electrical panel has a limit on how much solar it can safely accept. This home's 200 amp panel had room for about 25 solar panels. The household's electricity use called for 36. Without busbar overload control, the choices were to replace the electrical panel or to install a smaller system.

Does it cut down how much power the panels make?

Almost never. It only steps in if the house is pulling a lot of power from the grid at the same moment the panels are producing a lot, and that's rare. The rest of the time all 36 panels run at full output.

Could it work on my home?

If you've been told your electrical panel is too small for solar, there's a good chance it can help. We look at your panel during the site visit and tell you whether you need busbar overload control, a panel upgrade, or neither.

Aerial view of a home in Culloden, Nova Scotia with an 18 kW rooftop solar array

Case Study — No Panel Upgrade Needed

Full-Size Solar, Same Panel — Culloden, Nova Scotia

This home needed 36 solar panels to cover its power bills, but its electrical panel only had room for about 25. A safety feature from Enphase called busbar overload control let all 36 connect to the original panel, with no costly panel replacement.

Installed and switched on in September 2026.

System Size

18 kW

36 solar panels on the roof

Location

Culloden, NS

Digby County

Status

Up and running

Switched on September 2026

The Problem

The electrical panel was too small for the system the house needed

Every home has an electrical panel, the grey box with all the breakers. Inside it is a metal strip called a busbar that carries the power to every circuit, and it can only safely handle so much.

Solar panels send their power into that same strip. So the safety rules put a cap on how much solar a given electrical panel can take. This home has a common 200 amp panel, and the cap worked out to about 25 solar panels.

The household's power bills called for 36.

Normally that leaves two options: pay to replace the electrical panel with a bigger one, or install a smaller system and keep paying for the power it doesn't cover. Neither was a good outcome for this homeowner.

The Numbers

Solar panels, by the numbers

Solar panels this electrical panel could normally take	About 25
Solar panels the household needed	36
Solar panels installed with PCS	36

The home's original 200 amp electrical panel, kept in place for the 18 kW solar system

The Fix

A built-in safety net: busbar overload control

Enphase systems include a feature called busbar overload control, part of what Enphase calls PCS (Power Control System). A small monitor watches how much power is flowing through the electrical panel at all times.

If the solar panels and the grid together would ever push the panel past its safe limit, it turns the solar output down a little until things are back in the safe range. Because the panel is always protected, the full 36-panel system is allowed to connect to it. Nova Scotia Power reviewed the design and approved it.

In everyday use it almost never has to step in. The rest of the time, all 36 panels run at full output.

What it avoided

Replacing the electrical panel, the power shutoff and extra work that comes with it, and a system about two-thirds the size the household needed.

Project Overview

System Specifications

System size	18 kW
Solar panels	36 × LONGi 500 W
Microinverters	36 × Enphase IQ8HC (one per panel)
Electrical panel	Original 200 amp panel, kept
Panel protection	Enphase busbar overload control (PCS)
Monitoring	Enphase app, panel-by-panel
Installed	September 2026
Connected to the grid	September 2026

Timeline

From first visit to switch-on

Sizing the system

We sized the system to the household's actual power bills. That called for 36 panels on the south-facing roof.

Checking the electrical panel

During the site visit we found the home's 200 amp panel could normally take only about 25 solar panels.

Designing around it

Instead of replacing the electrical panel, we designed the system with Enphase busbar overload control and got it approved by Nova Scotia Power.

Install and switch-on

We installed all 36 panels in September 2026. Nova Scotia Power approved the system to send power to the grid a few days later.

Validated Estimates

Performance Estimates

Estimated for this home and the way its roof faces the sun.

Yearly production

~22,000 kWh

Estimated power made each year

Monthly average

~1,860 kWh

What the Homeowner Gets

Full-size system, same electrical panel

All 36 solar panels connect to the home's original electrical panel. No panel replacement and no extra electrical work.

Sized to the bill, not the panel

The system was sized to cover the household's electricity use. Extra summer power is banked as credits with Nova Scotia Power.

25-year warranties

The Enphase microinverters have a 25-year warranty. The LONGi solar panels have a 25-year product warranty and a 30-year performance warranty.

Panel-by-panel monitoring

The Enphase app shows what every solar panel is producing and flags any problem.

Common Questions

It's a feature of the Enphase system called PCS, or Power Control System. A small monitor keeps an eye on how much electricity is flowing through your electrical panel. If the solar panels and the grid together would ever push the panel past its safe limit, it turns the solar output down a little until things are back in the safe range. That safety net is what lets a bigger solar system connect to a panel that would otherwise be too small.

Told You Need a Panel Upgrade?

Send us a photo of your electrical panel. We'll tell you whether your panel can take the system you need as it is, with busbar overload control, or only with an upgrade.

902-907-0956 · tricountysolar.ca