Ask most solar contractors about California’s Net Billing Tariff and the answer arrives quickly: you will need batteries. It is not bad advice. It is residential advice, repeated to commercial customers who are in a materially different position.
We install storage and we think it is valuable in the right application. We simply do not think it belongs in most first commercial systems, and this article explains where the line falls.
Why the Battery Argument Exists
The reasoning behind pairing solar with storage is sound on its own terms. Under the Net Billing Tariff, electricity exported to the grid earns avoided-cost values rather than retail credit, and the lowest of those values fall at midday. A battery captures that low-value midday surplus and releases it later, when the building is drawing power it would otherwise buy at a far higher price.
That converts a poorly compensated export into an avoided purchase. Where the mismatch is real, the argument holds.
Why It Transfers Poorly to Commercial Buildings
The argument depends on a premise: that the building’s demand arrives after production ends. For a house, it does. Homes are mostly empty at midday and busy in the evening.
Most commercial buildings are the reverse. Consider what actually runs during business hours:
- Refrigeration and freezer compressors cycling hardest in afternoon heat
- Air conditioning loads that peak with the same sunshine driving the array
- Irrigation and pressure pumps running on daytime schedules
- Kitchen equipment, production machinery, compressors, lighting, point-of-sale
For these, the production curve and the load curve already overlap. There is no large midday surplus for a battery to rescue, because the building consumed it.
A battery is a device for moving energy through time. It earns its cost when energy needs to be moved. When production and consumption already coincide, it is expensive equipment solving a problem the building does not have.
What Storage Adds, Honestly Stated
| Consideration | Solar Only | Solar Plus Storage |
|---|---|---|
| Capital cost | Lower. Fewer components. | Substantially higher. |
| Daytime energy charges | Addressed directly | Addressed directly |
| Evening consumption | Not addressed | Addressed |
| Demand charges | Partial, not guaranteed | Can be managed dependably |
| Outage resilience | None — a grid-tied array shuts down in an outage | Available, depending on configuration |
| Maintenance surface | Fewer systems to monitor and service | Additional equipment with its own lifecycle |
Two rows there are genuine reasons to buy storage, and we say so plainly: dependable demand-charge management, and keeping critical loads running through an outage — increasingly relevant in our service area.
When We Recommend Storage
We raise it when one of these is true:
- Demand charges are a large share of the bill and the peaks are not reliably coincident with production.
- Significant load runs after dark — evening service, second shifts, overnight refrigeration ramps.
- An outage carries real cost — product spoilage, interrupted production, a facility that cannot simply close.
- The economics have changed for your situation since the last time it was evaluated.
If none applies, storage is capital that would earn more somewhere else in your business.
Phase One, and What Comes After
Nothing about starting without storage forecloses adding it. You do not have to install your entire long-term vision today. Many customers choose to begin with a system that fits their current budget and expand later as their business grows or when battery storage becomes economically attractive.
A well-designed first system is built with that in mind — electrical service, interconnection and equipment selection chosen so the next phase is an addition rather than a rebuild.
Larger, fuller installations including storage remain the right answer for businesses with confidence in a long-term presence and an interest in minimizing utility imports altogether. That is a legitimate objective. It is a different objective from reducing next month’s bill at the best available return, and it should be chosen deliberately rather than assumed.
What This Means for Commercial Customers
Be skeptical of any proposal that treats storage as automatic. Ask what specific problem the battery solves in your building, and ask for the interval data that demonstrates the problem exists.
If the answer is a general statement about net metering rules rather than a fact about your load, the battery is in the proposal because it is in the template.
At Light Ray Electric we evaluate your electrical distribution, major equipment, operating schedule, utility tariff, and energy demand to identify what the facility actually needs. Sometimes that includes storage. More often, for a first commercial system, it does not.
Our Design Philosophy
We recommend equipment based on practical field experience, not marketing hype. That applies to batteries exactly as it applies to inverters and everything else we specify.
The smallest system that solves your problem is the one we want to sell you — because it is the one that comes back with the best return, and because you are going to tell someone about it either way.
Request a free consultation and we will tell you honestly whether storage belongs in your project.