Residential · Springfield
Hillside Home Retrofit
Bill cut by ~90% with rooftop + battery backup.
9.2 kW
System size
$1,820
Annual savings
7.5 yr
Payback
25 yr
Warranty
Project details
A quick look at the system behind the savings.
Project type
Residential solar + battery
Location
Springfield
System size
9.2 kW
Battery storage
13.5 kWh backup system
Estimated savings
$1,820
Installed in
4 weeks from approval
Problem
High summer bills + outage risk
Solution
28-panel rooftop with 13.5 kWh battery
Results
~$1,820/yr saved, 8h backup
Project overview
A cleaner, more predictable energy setup for a high-usage family home.
The Hillside home had strong solar potential, but rising utility rates and frequent peak-time usage made monthly energy costs difficult to predict.
The homeowner wanted a system that could reduce grid dependence, protect against outages, and keep long-term running costs under control.
The challenge
High summer bills and outage risk were making energy costs harder to manage.
Before switching to solar, the home relied entirely on the grid during the most expensive parts of the day. Cooling demand, appliance usage, and evening energy needs created seasonal spikes that made monthly bills inconsistent.
The homeowner also wanted backup protection during short outages without installing a noisy fuel generator. The system needed to balance three things: everyday savings, reliable backup power, and a clean installation that worked with the existing roof layout.
Site audit
The system was planned around roof space, sun exposure, and real household usage.
Solwell reviewed the homeowner’s utility history, roof orientation, available panel area, and likely shading throughout the year. This helped determine the right system size, battery capacity, and expected production before any installation work began.
Rather than oversizing the system, the goal was to build around the home’s actual energy pattern. That meant prioritizing strong daytime production, evening battery support, and a payback period that made sense over the long term.
The solution
A 9.2 kW rooftop system paired with battery backup for evening use.
The final design included a 28-panel rooftop array and a 13.5 kWh battery system. During the day, the panels offset household energy use directly. Excess production charges the battery, which can then support the home during evening hours or short outages.
The installation was designed to be simple, low-profile, and easy to monitor. After activation, the homeowner could track production, usage, and battery status from a connected monitoring app.
The results
Lower bills, backup protection, and a clearer path to long-term savings.
The system is projected to save the homeowner around $1,820 per year, with an estimated payback period of 7.5 years. Over the lifetime of the system, the homeowner benefits from lower grid usage, reduced exposure to rising utility rates, and added protection during outages.
90% bill reduction
The system offsets most of the home’s regular electricity use.
8 hours of backup
Battery storage provides support during short outages.
7.5-year payback
The system is designed to recover its cost through long-term savings.
25-year warranty
Long-term protection across system performance and support.
