New tools and tech to prep your electrical panel for… | Canary Media

This is the second piece in a two-part series about home electrification. Read the first.

Barry Cinnamon, a longtime Silicon Valley solar entrepreneur and CEO of Cinnamon Energy Systems, is a big advocate of fully electric-powered homes. He’s also put his money where his mouth is, converting his own home heating and cooking — and the car he drives — to run on electricity supplied by his solar panels and battery as well as the grid.

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Cinnamon identified a number of challenges to going all-electric — getting ahold of the latest high-efficiency heat-pump air and water heaters, finding contractors familiar with the technology and techniques for installing them, and combining various rebates and incentives to help shoulder the higher costs involved.

But one of the biggest potential stumbling blocks is out of sight and out of mind for typical homeowners: the electrical panel. These ubiquitous metal boxes full of circuit breakers are the conduits between household electrical circuits and the power flowing from utility power grids.

If they aren’t hefty enough to power the heaters, appliances or electric vehicle chargers being contemplated as part of a home electrification project, replacing them with panels able to handle the job can add thousands of dollars and weeks to months of additional work.

If the wires connecting the utility grid to the house need to be upgraded as well as part of this process — which they sometimes do, since household electrical panels are often sized to match utility service — the cost and time involved go up significantly, he said.

Cinnamon estimated average outlays for a homeowner in his Northern California service area: ​“If you’re going to upgrade your electrical service from 100 amps to 200 amps, and the wires are above ground, it’s maybe $5,000 to $10,000” to buy and install a new electrical panel, get an electrical permit from the city, and coordinate with the local utility, he said. ​“It’s three to six months.” If the home is connected via underground power lines, which is typical for more modern and urban homes, ​“it’s $25,000 to dig up the street and put that in, and it takes a year.”

Cost and time estimates can be lower in other parts of the country. Nate Adams, a well-known home electrification contractor and adviser, said that upgrading a 100-amp circuit panel to a 200-amp panel, one capable of powering cold-climate home electrification projects like those he carries out in the Midwest, can cost between $3,000 and $6,000. Pecan Street, an Austin, Texas–based nonprofit research organization, comes in with a lower estimate of $1,000 to $5,000 for a panel upgrade without a utility service upgrade, which it said could take several weeks to complete.

Whatever the local details, upgrades to electrical panels and utility service can make or break the deal for home electrification projects. Very few homeowners are willing to wait weeks or months to replace broken-down natural-gas-fired furnaces or water heaters with electric heat-pump models, Cinnamon said. Even those who’ve planned the switch to all-electric well in advance may balk at the time and costs involved.

This is a major problem for the 48 million homes that a recent Pecan Street report estimated lack sufficient electrical service to go all-electric. At an average cost of $2,000 per upgrade, that adds up to ​“as much as a $100 billion impediment to residential electrification in America,” the report states — and $2,000 per home is at the low end of estimates.

That’s why a number of all-electric home contractors are looking to new technologies from startups and major electric equipment manufacturers that can help solve these electrical panel bottlenecks. The options range from relatively simple circuit-sharing plugs that can safely split the demands of major electrical loads, to fully digital electrical panels and circuit breakers that offer Wi-Fi connectivity and active control over EV chargers, batteries and other key electric assets.

Simple circuit-switching devices to keep big loads in check

One such tool is the SimpleSwitch, a hard-wired ​“circuit-sharing plug” that connects two separate loads — an EV charger and a heat pump, for example — into one 240-volt circuit. It then prevents both loads from simultaneously drawing power.

The Sacramento Municipal Utility District, the public utility serving California’s state capital and surrounding area, is promoting the use of SimpleSwitch devices by its customers. As an electric-only utility, SMUD has been designing rate structures and offering incentives and rebates to shift customers to all-electric appliances and heating systems to help reduce carbon emissions.

That saves money for both customers and the utility. SMUD estimates that it costs the utility $4,725 on average to replace electrical panels and add circuits for customers that are part of its low-income electrification program, and up to $9,000 for retrofits featuring underground distribution lines or other complications.

Sean Armstrong, managing principal of California-based all-electric home developer Redwood Energy, describes SimpleSwitch and similar devices designed to support EV chargers, such as NeoCharge, Dryer Buddy and Splitvolt, as the equivalent of a household power strip for 240-volt devices. They allow more loads to be connected at the home than would otherwise be supportable by the existing electrical panel.

While the SimpleSwitch is hard-wired to keep one primary load on and shut down a secondary load when it exceeds the circuit’s capacity, other devices come with software controls that can be programmed to favor one load over the other based on variables such as relative load share or time of day or week. These devices cost a few hundred dollars — far less than the few thousand dollars that might be needed to replace a panel. Redwood Energy’s pocket guide to all-electric retrofits shows a few of the options.

(Redwood Energy)

Whether these types of circuit-sharing plugs can keep the loads in an electrification project low enough to avoid the need for a panel upgrade depends on the kind of work that’s being done, Armstrong said. The National Electrical Code, which governs electrical work in all 50 states, requires electrical panels to be sized to support the maximum simultaneous draw of every load connected to them, but it primarily applies to ​“hard-wired” systems that don’t plug into outlets.

“If you’re doing retrofits, these plug-in devices are pretty standard,” Armstrong said. But there are different standards for new construction than for retrofit projects. 

Smart electrical panels 

There are limits to how far circuit-splitting can get you, however, Cinnamon cautioned. Customers who are combining rooftop solar, a battery, EV charging and other smart electric appliances are likely to need a panel upgrade — and they might want a ​“smart” electrical panel that can help them efficiently manage all of that equipment.

Once rooftop solar comes into the picture, ​“you absolutely, positively need to upgrade to 200 amps,” he said. While that’s not universally the case, it’s a view largely backed up by solar installers and electricians, given that many households installing solar will find themselves exceeding the capacity of smaller panels and may have plans to electrify more household loads and buy EVs.

Adding a battery to a rooftop solar system adds even more complexity, Cinnamon said. Most homeowners buy batteries for backup power during grid outages, but the typical residential battery system doesn’t provide enough energy to power an entire home for an extended period of time. Customers who want to power critical systems like refrigerators, heaters or medical devices need to either actively turn off anything else that might deplete the battery or hard-wire those critical devices separately, a task that requires extra equipment and expensive hours of work by an electrician.

To solve this problem, a new class of smart electrical panels and similar devices have come onto the market over the past few years. Two of the country’s biggest electrical panel manufacturers, Schneider Electric and Eaton, have unveiled such products: Schneider’s Square D panel has digital controls embedded into the panel itself, while Eaton’s embeds them into the circuit breakers within the panel. Armstrong also mentioned Canadian company Koben’s Genius smart panel, which Redwood Energy is studying for its potential to put plugged-in EVs to use in supporting household loads during power outages.

San Francisco–based smart electrical panel startup Span is pursuing a similar path with Sunrun, the country’s leading residential solar installer. In October, the two companies announced a partnership to use Span’s panels in select markets to give Sunrun customers the ability to choose which household circuits are powered by solar, battery or grid power. The Span panels are cloud-connected via Wi-Fi, so owners can control them with a web and mobile app.