SMA Solar Technology's 2023 Shipments Hit 20.5 GW: A Solar Installer's Perspective on Health Fears, 1000W Kits, and Battery Storage Costs

Three questions follow me around more than any others: Do solar panels cause cancer? What can a 1000 watt solar panel kit really run? How much is solar battery storage?

They sound unrelated. A few years ago, I would have answered them in separate phone calls and moved on. After more installation work than I care to count, one warranty failure that ate an entire project margin, and one sales conversation I still cringe about, I know better. All three questions are really about risk, units and trust. And all three have become more common as solar has grown faster than the knowledge around it.

SMA Solar Technology's 2023 shipments reached 20.5 GW. If you search for SMA inverter shipment 2023 GW data, that is the number you will find. I am not quoting it to show off a manufacturer's record. I am quoting it because it explains the awkward moment when an industry moves faster than consumer education.

The health question is not a panel question. It is a radiation-literacy question.

In 2017, I watched a mother search for the phrase solar panel health side effects cancer while her kids were sitting at the same table. I gave her a polite marketing answer. She did not buy the system, and I deserved that. She asked a serious question, and I treated it like a public-relations problem.

I am an installer, not an oncologist. But I have learned enough electrical physics to stop being afraid of the wrong things. Under normal operation, a solar panel produces DC electricity. DC wiring in a house generates extremely low-frequency electromagnetic fields, the same broad category as the wiring in walls and the motor in a refrigerator. Those fields are non-ionizing. They do not carry enough energy to strip electrons from atoms. DNA damage of the kind that can lead to cancer requires a completely different type of energy.

No honest public-health body has shown a consistent causal link between residential power-frequency EMF and cancer. The National Cancer Institute's summary of the EMF and cancer literature reaches the same place. That is not the same as saying all solar equipment is harmless in all conditions. It is not. Burning a module, cutting into it, swallowing battery electrolyte, or installing a rooftop system without proper electrical protection are all genuinely dangerous. A badly installed roof mount can fall or catch fire. Those are the real risks, and they are the ones I check for before I worry about radiation.

Why SMA Solar Technology's 2023 shipments belong in this conversation

I bring up SMA Solar Technology's 2023 shipments because business buyers evaluate risk, and shipment records are part of that. The 20.5 GW figure tells you this is no longer a pilot project. It is deployed in enormous quantities. It has to survive grid inspections, weather events, utility paperwork, and years of thermal cycling. That is why serious inverter suppliers keep local support channels, publish warranty terms, and list their equipment to standards like UL and IEC.

Cheaper hardware exists. I have installed some of it, and I have paid the repair cost when its protection settings silently misbehaved. A no-name inverter is not automatically bad, but it is a different procurement decision. If you are buying for a client, the cheapest electronics often become your own support burden.

What surprised me was the side-by-side comparison. When I put a budget inverter next to a unit from a serious manufacturer, the difference did not show up on the spec sheet. It showed up in how hard the fan ran, how fast thermal derating kicked in, and who answered the support line after three years.

A 1000 watt solar panel kit is a rate, not an energy plan

Let us get the terms straight before the mistakes start. A 1000 watt solar panel kit has nameplate capacity: under standard test conditions, it can produce electricity at 1,000 watts. Your electric bill is measured in kilowatt-hours, which is energy used over time. Those are different things.

A 1 kW array in Phoenix is not the same as a 1 kW array in Seattle in December, even if the panels are identical. The same kit can produce several times more energy per day in one location than in another. A useful reference for location-specific estimates is NREL's PVWatts calculator, because it uses local weather data, tilt, and losses rather than marketing assumptions.

On a practical level, a good 1 kW array in a sunny part of the United States might produce 3 to 5 kWh per day. That can offset a modern refrigerator, some LED lights, laptops, and phone chargers. It is not sized for electric space heating, central air conditioning, or daily EV charging. If your real need is larger than that, a 1000 watt solar panel kit is the wrong starting point.

The same kW and kWh confusion ruins battery designs. A 10 kWh battery paired with a 1 kW array can only recharge at the sun's available rate. If that battery is empty after a three-day storm, one clear day will not magically refill it unless enough solar energy reaches the roof and stays at home.

How much is solar battery storage? The question is hiding the real quote

Now for the question I hear in almost every discovery call: how much is solar battery storage? I answer with a sentence nobody loves: it depends on what you are asking the battery to do during an outage.

A modest backup circuit, with a refrigerator, internet router, lights, and maybe a furnace fan, usually needs 8 to 12 kWh of usable storage. A battery intended to run central air conditioning, an electric oven, or a water heater is a different machine and a different bill.

When you receive a storage quote, remember what is inside it:

• Battery hardware, chemistry, and the usable capacity after the manufacturer's recommended depth-of-discharge limit
• Storage inverter or coupling equipment
• A critical-loads subpanel and automatic transfer switch, if the system is meant for backup
• Permits, labor, wiring, shipping, and commissioning

In the quote sets I reviewed from 2022 to 2024, a fully installed 10 kWh AC-coupled battery system usually landed between $10,000 and $18,000 before tax incentives. That range assumes an existing solar array, a compatible battery inverter, a small critical-loads subpanel, labor, permits, and basic commissioning. It does not include replacing a main electrical panel. That can add $1,500 to $5,000 in many older homes. Federal tax credits can reduce the total by roughly 30 percent if the installation qualifies, but state and utility incentives vary too much for one blanket number.

What most vendors will not tell you is that battery hardware is often only half the invoice. The storage inverter, transfer switch, subpanel, permits, and the extra labor for a heavy wall-mounted unit can exceed the module price. That is why comparing shelf prices is misleading.

I made my own mistake on a 2023 backup job. I sized the battery for the refrigerator, router, lights, and a few outlets. I forgot the well pump. In an outage, the fridge stayed cold, but nobody had water. It was my scope error, not the battery's fault. It cost me an extra service call and a chunk of trust, and I have never forgotten it since.

The short checklist I use before any solar purchase

I have made enough expensive mistakes to keep this simple.

1. Write down the loads you actually want to keep running, in kWh and peak watts. Do not start with everything.
2. Take health questions seriously. If a salesperson cannot explain the difference between ionizing and non-ionizing radiation, find someone who can.
3. Compare inverter brands by support network, certifications, warranty process, and installed fleet. That is why a number like SMA Solar Technology's 20.5 GW of 2023 shipments is useful, even if it is not a health certificate.
4. Ask every battery bidder for installed cost per usable kWh, including permits and electrical work.
5. Use the same units throughout every proposal. Watts are not watt-hours. DC capacity is not AC output. Manufacturer battery capacity is not always usable capacity.

Source notes: The 20.5 GW figure comes from SMA Solar Technology AG's fiscal year 2023 report. The EMF and cancer summary follows the National Cancer Institute's Electromagnetic Fields and Cancer fact sheet. Battery price ranges reflect installation quotes reviewed by the author, not manufacturer list prices.