Standby Generator Service and Solar Panel Installation in Princeton, NJ | Panasonic HIT Panels and a Takeover

Princeton, NJ · Client since August 2019

Alastair and Leslie in Princeton have been Green Sun Energy Services clients since August of 2019. On the same day they signed for a new solar array, they put the standby generator already on the property onto a service plan with us.

33 Panasonic panels, 10.9 kW

Thirty-three Panasonic HIT 330-watt panels, 10.89 kW in total, on Unirac mounting with a SolarEdge SE7600H HD Wave inverter and an optimizer on every panel. Estimated first-year production is 12,422 kWh and the utility is PSE&G. It was commissioned on 20 November 2019.

The panel choice is the part worth explaining. HIT is a heterojunction cell — a thin layer of amorphous silicon over a crystalline wafer — and its distinguishing characteristic is not peak output but how little output it loses when it gets hot.

Every silicon panel produces less as its temperature rises, and a roof in July is a great deal hotter than the 25 degrees at which panels are rated. A conventional module can shed a meaningful fraction of its nameplate on exactly the afternoons when the sun is strongest. A heterojunction cell loses noticeably less, which means the gap between the number on the datasheet and the number on the meter is smaller in the months that matter most.

A 20 kW machine taken on the same day

The standby generator is a Generac 20 kW, model 6250, installed by another company before we were involved. Its servicing came to us in August 2019 on a PowerBase Silver plan, and it was last serviced on 24 December 2025.

Two decisions, one conversation

These two systems have almost nothing in common. One was new in 2019 and is ours; the other was already several years old and was somebody else’s work. One produces power on sunny days; the other produces power on the days there is none coming down the street. One is on the roof and the other is beside the house.

What they now share is a single point of responsibility, and that was settled in one conversation rather than two.

It is worth being clear about why that helps, because it is not really about convenience. A grid-tied array shuts down the instant utility power fails — it has to, so that it cannot feed a line a crew is working on — which means that on the day this property most needs electricity, everything depends on a machine nobody had looked at in years. Buying the array from a company that could also open up the generator, establish its condition, and put it on a schedule closed that gap on day one rather than discovering it during the first storm afterwards.

Questions from Princeton homeowners

Standby generatorCan a standby generator run central air conditioning?

Yes, when it is sized for it. The design has to account for both the running demand and the starting surge of the air-conditioning equipment. Load-management equipment can be used where necessary so that demand does not all arrive at once.

SolarCan the utility turn a solar system down?

Yes -- approval is not automatic. A system can need modification or further review because of its size, transformer limitations, the condition of the circuit, protection requirements, the service configuration or the grid's hosting capacity.

Standby generatorCan a generator go in the side yard of a Princeton property?

Often yes, provided the side yard satisfies both the manufacturer's clearances and the municipality's zoning requirements. The site review covers the property-line setback, windows and doors, the gas and electric meters, the air conditioner, neighboring structures, flood conditions, service access and any local screening requirement.