Solar Electrical Systems
ACS Electrical Contractors provides safe, reliable solar electrical systems for homes, camps, and businesses throughout Maine. We handle everything from panel connections and inverters to battery storage and system integration.
Overview
The electrical work on a solar install is usually misunderstood as "wiring up the panels," when most of it actually happens downstream of the array. PV modules produce DC; the interesting electrical work begins at the inverter and runs through disconnects, the production meter, and the interconnection to the service. Two interconnection methods cover most residential and small-commercial systems: a load-side breaker landed in the main panel, which has to obey the 120% busbar rule, or a supply-side tap between the meter and the main breaker with its own service-rated disconnect. Which one a given system needs is a function of the panel bus rating, the PV breaker size, and how much headroom the existing service has.
For properties the grid does not reach, the architecture is different. A standalone system uses a PV array to charge a battery bank through a charge controller, with a dedicated inverter/charger producing the AC that feeds the cabin or house panel. Sizing is everything a weekend camp with a fridge and a few lights is a different load profile than a full-time off-grid residence with a well pump and electric heat and under-sizing the battery or the inverter is the mistake that leaves owners running a generator more than they expected.
The AC Side of the Array
For grid-tied systems, we handle the AC-side work most module installers would rather not carry themselves: the inverter output, rapid-shutdown and DC disconnects where required, the production meter, the AC disconnect, and the interconnection to the main panel or service. We run the load calculation, pick the interconnection method against the panel bus and the PV breaker, and coordinate the interconnection application and net-metering paperwork with Central Maine Power or Versant. Inspections by the utility and the local AHJ are part of the job we schedule them and walk them through.
For off-grid systems, we wire the DC bus from the array through the combiner and charge controller to the battery bank, size and land the inverter/charger, and build the AC distribution so the house panel sees clean 240-volt output. Generator input on the same inverter is a common addition for winter use, and we wire the transfer logic alongside it. Where an existing solar contractor has dropped equipment on a pad and walked away from the electrical side, we are also comfortable landing the work and finishing the install to inspection.
Why Choose ACS?
- We tailor every solar project to your property, power needs, and future goals.
- Need power in a remote location? We specialize in stand-alone systems with battery storage.
- We wire to NEC standards and coordinate inspections and utility approvals when needed.
Custom-Designed Systems
We tailor every solar project to your property, power needs, and future goals.
Off-Grid Expertise
Need power in a remote location? We specialize in stand-alone systems with battery storage.
Code-Ready & Inspected
We wire to NEC standards and coordinate inspections and utility approvals when needed.
Serving the Lewiston-Auburn Area
Off-grid camps in the Range Ponds region and out toward Naples and Casco are a regular call for us running a new service drop from the nearest utility pole to a seasonal cabin often costs more than a well-sized PV-and-battery system, and the owner ends up with something quieter and cheaper to run than a generator. Grid-tied residential rooftop work concentrates in Freeport, Pownal, Yarmouth, and the Cumberland corridor, where homeowners are usually coordinating with a solar design-install company and call us in for the AC-side work, the service tap, and the CMP interconnection coordination. As a licensed Maine electrical contractor handling PV interconnections and standalone battery systems across Androscoggin and Cumberland counties for more than two decades, we are comfortable picking up the work another contractor started or carrying a standalone-camp install from the pad to the inverter ourselves.