Whole house generators have become popular home improvements in recent years. Multiple
winter storms have crippled the state’s grid, political unrest has become a real concern for
many, and the flow of millions of newly minted Texans has only exacerbated the need for
power.

As with any electro-mechanical system, a whole-house generator requires a bit of maintenance.
For generator owners, ensuring their power stays on when the power turns off doesn’t need to
be a source of worry or surprise by big invoices and hassles.

Generators do require regularly scheduled maintenance. Manufacturers build alerts into their
systems to make sure that system owners are aware of this. For example, Generac units throw
an alarm code annually to check the battery. Batteries are the number one failure in
generators – and it’s usually a hidden failure. Because batteries are out in the elements, they
are highly susceptible to corrosion. While this is an easy problem to repair and prevent, it’s
nefarious because the battery will still provide voltage to the controller, will still charge, and
will still present itself as viable UNTIL large amounts of amperage are demanded of it – to start
the generator!

This example is one of many, illustrating how something easy to remediate and prevent can
become a total failure at the most essential moment. Other examples include firmware
updates, sensor circuit grounding, engine break-in service, inlet gas pressure adjustment
(they’re almost always too low), and oil consumption (break-in periods burn oil).

To a seasoned generator technician, these are all easy to spot, easy to fix, and easy to prevent.
However, that assumes that a technician is looking at the generator. Maintenance contracts
are an easy way to ensure that a professional is looking after your system.

Another maintenance “low hanging fruit” for generator owners is to take time to learn how the
transfer switch and generator work and work together. That doesn’t mean memorizing
complicated wire diagrams, it just means learning the basic function from an experienced
technician to learn the steps to get lights back on quickly and easily.

For example, Generac Auto Transfer Switches are manufactured with a provision to manually
transfer in the case that the auto function failed. Generators can be manually started in the
case the that the auto start failed. Overloaded generators can be reset in a matter of seconds.
Generators are insurance policies, make sure the policy is in good standing.

During normal conditions, a grid-tied solar PV system “pushes” electricity into the
home’s electrical service to be used by electrical loads. Excess energy goes through
the meter to the electrical utility. During grid outages, a home backup generator starts
itself and “tells” the transfer switch goes into action. The transfer switch isolates the
generator from the grid, protecting linemen and not causing electrical interference on
the grid.

Utilizing both systems, the home is saving money during normal operation and powered
up during electrical outages. However, there are some issues that need to be
addressed for this setup to work safely and correctly.

Grid-tied PV systems are basically current pumps. They sense the grid’s electrical
parameters and dutifully push electricity into the circuit. The word “push” is used
because in a sense, that’s exactly what it’s doing – it’s generating electricity with more
electromotive force than the grid’s supply. Wait, what?

Imagine a water pipe supplying a house with 40 psi. Say the house wanted to send
water BACK to the supply. It would have to generate MORE pressure to send the water
back against a 40-psi supply. So, it might generate 45 psi so that the water flows
backwards.

This fundamental concept applies to any electrical system that has both a generator and
a PV system. A PV system cannot distinguish between a grid or a generator. During a
power outage, the PV system will attempt to back feed a connected generator, thinking
that it’s the grid. This can cause damage to the generator and possibly fires or electrical
hazards. Careful consideration must be taken to isolate the solar system from the
generator.

There are two ways to accomplish this: One method is to connect the PV output circuit
to the utility side of the generator’s transfer switch. This ensures that when the grid
electricity is not available, the PV system doesn’t have a place to export, and shuts off.
The other method is to install a contactor on the PV output circuit. Basically, the
contactor (a large switch) shuts off the connection to the PV system when the
generator is running. Generac Smart Management Modules can be configured to
perform this task on Generac units.

These two simple isolation techniques can ensure that your two electrical generation
devices don’t cause thousands of dollars in damage to each other, the home, or its
occupants.

On March 1 st , 2022, Pedernales Electric Coop announced a change to its Solar Interconnection
Rate. The change was made after results of a board-commissioned study were published in
November 2021. The stated mission of A Review of the Value of Solar Study, performed by GDS
Associates and corroborated by the Perryman group, for Pedernales Electric Cooperative was to
“true up” the previous solar interconnection rate; to account for a “subsidy” that PEC claimed
solar owners were receiving at the expense of non-solar owners.

This subsidy is described in the report as follows: “The “Value of Solar Study” shows that a
member-owned solar system provides some decrease in costs for transmission access charges
during the summer, but solar systems do not reduce the direct costs incurred by PEC for
investment, operations, and maintenance of the distribution system.”

“With increasing use of distributed generation among customers, electricity providers must
determine the appropriate method and amount of compensation to provide these customers. The
compensation must be fair and equitable to all customers. In addition, it must cover associated
costs to make the programs economically feasible and sustainable.” – Perryman Group
Meters at solar-equipped services record Delivered power, Received power, and Net usage.
Previously, PEC billed solar owners for the Net kilowatt hour value. Bear in mind that a solar
system’s electrical production services the home first, with excess power traveling “up” the
meter and onto PEC’s lines. Essentially, PEC was buying each kilowatt hour received from the
member at the delivery rate.

“From a rate standpoint, the reduced energy purchases of a member with [Distributed
Generation] will be treated the same for equity purposes as if a homeowner installed energy
efficiency measures to reduce energy consumption.” -Value of Solar Study, 2021
A kilowatt sent back to PEC’s lines is credited on the member’s bill at a rate of $.055377 per
kilowatt hour. Essentially, members will pay for every kilowatt delivered at the normal rate, but
see a line-item credit on their bill for about 5.5 cents per kilowatt hour sent to PEC’s electrical
infrastructure.

For members considering going solar, this will affect their ability to accurately calculate
financial payback models, as a produced kilowatt hour may be worth about 5.5 cents or about
twice that if consumed. One strategy might be to orient arrays westward, to closely match power
demand curves. Calculating solar production is easy, matching consumption in real time can be
challenging.

Value of Solar Study: https://www.pec.coop/wp-content/uploads/2021/11/Interconnected-
Generation-Value-of-Solar-Study-Report.pdf
Perryman Group Review https://www.pec.coop/wp-content/uploads/2021/11/Interconnected-
Generation-Perryman-Group-VOSS-Review.pdf
PEC Interconnection Rates https://www.pec.coop/your-service/distributed-
generation/interconnection-rates/

Once again, the good people of Wimberley were challenged by an unruly meteorological event.
The name is still being debated – “#Icenado’23”, “Elmmageddon”, “Oaknarök”, “The
Snappening”. But as chainsaws wail their sad dirges to fallen trees, the community’s response is
as expected – helpful, neighborly, compassionate. At the time of writing, First Baptist Church
(FBC) has a new mountain of wood chips rising in its street front. The forum is full of kind folks
offering to help and warnings of rip-off artists. And at home, everybody is hard at work clearing
their yards, cleaning out their fridges, and probably sipping a drink and shedding a tear at the
trunk of their favorite old live oak.

Five days after the front blew in, there are over 1000 electrical meters out of service – a large
portion of them in the Wimberley area. As the area has grown and developed, PEC has
expanded service to new neighborhoods and communities. Many of these developments draw
power from a distribution system that stretches over large ranches with limited access,
overgrown easements, and canyons, hills and valleys. For our heroic linemen, the struggle is
real. For our folks without power, the deep-freeze is a biohazard.

As one might expect, demand for generators is surpassed only by chainsaw purchases. Since
Snowpocalypse’21, the community has seen a steady growth in home back-up installations. For
genset owners, the play paid back dividends. For the community, the play also worked out,
benefitting homes and community fixtures alike. FBC is implementing plans to install a large
diesel generator and work with first responders for such outages. For homeowners, their
generators provided opportunities to help themselves as well as others:
With the lights and heat on, there are opportunities to grab some lumber and shore up a
favorite tree, invite the neighbors over for a movie and a hot meal. Not that close to your
neighbor? -Send a batch of chili over (beans, no beans – judgement-free zone). With the hose
bibs steadily dripping, there is time to go check on the elderly and kiddos, let the linemen into
the neighbor’s gate, run a bale of hay out to cold livestock, knock the ice out of the troughs.
Maybe just get some work done to avoid lost wages. Plan to create your own opportunities.
“In preparing for battle, I have always found that plans are useless, but planning is
indispensable.”
-Dwight D. Eisenhower