Standby Generator Installation and EV Charger Installation in Rumson, NJ | 20 kW Generac

Rumson, NJ · Client since August 2020

Anna from Rumson, NJ has been a Green Sun Energy Services client since August of 2020, and came back for a car charger four years later. The generator is the one people remember, and not for its size.

A 20 kW Generac, and a window that had to stop opening

Commissioned on 25 February 2021. The calculation asked for a minimum of 14 kW under NEC Article 220 Part IV and a Generac rated 18 kW on natural gas went in – 20 kW on propane – behind a 200-amp managed whole-house transfer switch with a smart management module. The house is 2,300 square feet with three refrigerators, a dishwasher, a washer, a gas dryer and a sump pump.

The condition attached to the job is the part worth reading. A generator has to sit a set distance from any window or door that opens, because exhaust goes to the nearest opening and a house will draw it in. At the position this machine had to occupy, that distance could not be met – so before the install could go ahead, the household had the window to its right replaced with a fully sealed, non-operational unit. It sounds like bureaucracy and it is not. The alternative is a running engine a few feet from a window somebody opens on a warm night in the middle of an outage.

A Tesla Wall Connector, outdoors beside the generator

July of 2024. The household supplied the charger – a Tesla Wall Connector, NACS – and we installed it outdoors next to the generator, on a dedicated 60-amp circuit at 11.5 kW with a management module of its own, adding roughly 36 miles of range an hour.

Two machines on one wall

The charger ended up a few feet from the generator, which is tidy and also sensible. Both are large loads served from the same 200-amp panel, and by 2024 that panel had already been surveyed once and given a module to arbitrate with. The charger got a module of its own, so it can be held back while the machine is carrying the house – a car charging overnight is the easiest big load in a home to defer, and the last one anybody wants competing with three refrigerators and a sump pump. There is a quieter connection too: the clearance rule that fixed the generator’s position in 2021, sealed window and all, is the reason there was already a settled, code-compliant piece of wall to put a charger on three years later.

Why Anna chose Green Sun Energy Services

Professional home EV charging made simple, from electrical design through final inspection.

Complete backup power, from sizing and installation to the service that keeps it ready.

What makes Green Sun Energy Services different

• EV charging: installed with certifications from Qmerit, ChargePoint, Enphase, SolarEdge and Tesla, by a licensed electrician and fully managed by our team. On this home: a Tesla 1457768-02/NACS (Customer Supplied) EV charger with three charging ports, each on its own 60-amp circuit.
• Standby generators: installed and serviced as a Generac Authorized Sales and Service Dealer, by factory-authorized Generac technicians. On this home: a Generac 7039-1 standby generator (20 kW LP / 18 kW NG) running on natural gas, on a 200-amp transfer switch (managed whole house) and serviced by Green Sun Energy Services.
• Warranty: backed by a 5-year generator workmanship warranty.
• Local: locally owned and operated in New Jersey since 2010, NJHIC licensed (#13VH06229000), with 35 completed EV charger projects and 441 completed standby generator projects across Monmouth County and 91 EV charger projects and 618 standby generator projects throughout New Jersey.

Our work in Rumson

Green Sun Energy Services has completed 1 EV charger installation, 5 standby generator installations and 11 generator service customers in Rumson. Rumson, a borough on the Navesink and Shrewsbury rivers in Monmouth County, is served by JCP&L.

Thinking about a standby generator, an EV charger, or both for your Rumson home? Tell us about your project here or call 732-410-7818.

Power it. Protect it. Maintain it.

Questions from Rumson homeowners

EV chargingWhat circuit does a Tesla Wall Connector need?

At its maximum 48-amp output it normally needs a 60-amp circuit, because the code requires overcurrent protection for a continuous load to be at least 125 percent of it. Where the electrical system cannot support that, the Wall Connector can be commissioned lower and put on a correspondingly smaller circuit.

EV chargingDo two chargers need twice as much electrical service?

Not necessarily. Power-management features can divide the available charging capacity between several units -- Tesla's group power management supports as many as six Wall Connectors sharing an established limit. Two chargers can be installed while the system holds their combined load to something the house can support.

EV chargingWhere should a home EV charger be mounted?

Somewhere the cable reaches the car's charging port comfortably, without tension and without lying across a walkway. Worth thinking about before the location is fixed: where the port sits on the current car and might sit on the next one, whether the car parks inside or out, the cable length, how the driveway is used, and where the garage door travels.

Standby generatorDoes the residential building code apply to a generator?

It can. For applicable one- and two-family dwellings New Jersey adopts the 2024 International Residential Code, subject to state amendments. Structural and flood-related generator installations may therefore need review under the residential subcode as well as the electrical and fuel requirements.

Standby generatorDoes a house with a generator still need surge protection?

Yes. A generator protects against the loss of utility power; it does nothing about a surge. Current electrical code includes surge protection for applicable dwelling services, so whole-house surge protection belongs in a properly designed generator installation rather than being treated as an extra.