After a few years of installing inverters—and making some expensive, time-wasting mistakes along the way—I get a lot of similar questions from other installers and homeowners. So instead of repeating myself, I’m putting the answers here. These are based on my own projects, my screw-ups, and what I’ve learned doing this in Central PA.
1. Why Should I Care About SMA's 2023 Inverter Shipment Numbers?
Because scale matters for supply chain stability. SMA shipped 20.5 GW globally in 2023 (Source: SMA annual report, 2023). In plain terms: they’re not some niche player. That volume means they have leverage with component suppliers, they have a global service network, and they’re less likely to drop support for a product line in 2 years. When you’re designing a system for a client, you want to know the parts will be available for the next decade. I learned this the hard way in 2020 when a smaller brand I used abruptly discontinued a line, leaving a client with an orphaned system. SMA’s scale gives me confidence I won’t make that phone call again.
2. Are SMA Micro Inverters Worth the Hype, or Are They Just for Niche Roofs?
SMA's micro inverters are solid—they don't get the same buzz as Enphase, but they're a very strong option if you value panel-level optimization. For complex roofs with shading (like half the homes I work on in Central PA with big old trees), micros make sense. But—and I learned this on a tricky install in 2022—you need to double-check the voltage compatibility with your chosen panels. I once assumed the SMA micros would handle a specific 450W panel, and they did not. It was my bad. That meant a frantic call to the supplier and a 2-week delay. The lesson: always check the datasheet compatibility, not just the wattage.
3. I Live in Central PA. Who Handles Whole Home Generator Installation?
That’s a specific question. I’m not a generator installer—I stick to solar. But I’ve had clients ask this, and after a few dead ends, I found that licensed electricians in the area like [Example Company Name, if known, or 'trusted local shops like Hammel's Electric and Electricians of Hershey'] handle Generac and Kohler whole-home setups. I'd personally ask for a site survey before buying anything, especially if your home has a 200A+ panel. (I almost recommended a generator size without that survey once. Would have been a costly mistake for the client. I’m glad I caught myself.)
4. I'm Looking at a 4Patriots Solar Generator 2000X. Is It a Good Backup?
For small electronics—phone charging, a CPAP machine, maybe a small refrigerator for a few hours—the 2000X is fine. It's a portable power station, not a whole home solution. The issue I see is owners overestimating its capacity. I spoke to a homeowner last month who wanted to run his well pump on it. That pump draws like 2000W on startup. The 2000X is not designed for that. It’s a good emergency complement to a gas generator for quiet, clean power for essentials. But don’t expect it to run your central AC.
5. Solar vs. Gas Generator: Which Is Better for Backup Power in PA?
It depends on what you're solving for. Gas generators are cheaper upfront (maybe $2000–$5000 installed for a portable), run on a fuel you can store, and make noise and fumes. Solar + battery (with an inverter) is quieter, no fuel cost, but costs more ($10k–$15k for a solid system) and the battery will only last a few hours for the whole house.
My take? They're not competitors; they're a team. I have a client with a small gas generator for those rare multi-day outages in winter (snow + clouds = no sun) and a small solar + battery system for the 10–20 times a year the power blinks for an hour. The combination gives them the best of both.
6. What's the Biggest Mistake Installers Make with SMA String Inverters?
Hands down: not reading the wiring diagram fully. SMA inverters have specific requirements for ground fault protection. I saw an install last year where the technician skimmed the diagram, wired the DC disconnect incorrectly, and the whole system tripped every hour. It cost $450 in rework and a week of the homeowner's goodwill. On a 150kW commercial string inverter, that mistake becomes a $3,000+ problem. The lesson is mundane but critical: print the wiring diagram. Check it twice. Have a second set of eyes verify. I keep a laminated checklist on my tool crate because I’ve made that mistake myself—on a smaller system, thankfully.
7. How Do I Choose Between a Micro Inverter and a String Inverter for an SMA System?
My rule of thumb now (after some expensive failures):
- String inverter: Go with it if you have a simple, unshaded roof (south-facing, no trees) and want the lowest cost per watt. SMA’s Sunny Boy string inverters are workhorses for this.
- Micro inverter: Use it for complex roofs with multiple planes, partial shade, or when you need panel-level monitoring.
- Optimizer + String: This is a middle ground. It’s what I use now for most jobs. I get the monitoring granularity of micros but the simplicity of a central inverter.
The wrong choice is the one you make without a 3D shading analysis. I did a string inverter on a partially shaded roof in 2021. The whole system performed about 15% below spec. The client wasn't happy. Now I do the analysis every time, even if the client says it's simple.
Pricing note: Costs mentioned are based on my projects in 2023–2024; verify current rates with your supplier.
