Backup Power · San Miguel de Allende
Whole-House Backup Power
in San Miguel de Allende
Looking for a backup generator? There's a better answer. We're authorized Firefly installers — silent, fuel-free battery backup that keeps your home running when CFE drops, automatically, with no generator noise and no fumes.
Generator vs. Battery Backup
A generator's job — without the generator.
When the power goes out in San Miguel, you want what a generator promises: lights, fridge, water, internet, and security still running. The Firefly battery system delivers exactly that — and leaves behind everything a fuel generator drags with it. No engine roar. No exhaust. No fuel runs. No switch to flip. No service schedule.
Fuel Generator
- Loud engine you hear next door
- Exhaust fumes and emissions
- Needs fuel stored and refilled
- Manual start or transfer switch
- Regular servicing and oil changes
- Only does something during an outage
Firefly Battery Backup
- Completely silent — no engine at all
- Zero emissions, safe indoors
- No fuel, ever
- Fully automatic — switches in under 20ms
- Virtually maintenance-free
- Protects power quality 24/7, not just in outages
Why It Matters in SMA
San Miguel's grid is not as steady as it looks.
Outages are part of life here — but they are not the only problem. A lot of the damage happens quietly, between the blackouts.
Rainy-season blackouts
From June to October, Bajío storms knock out the CFE grid regularly — sometimes for hours, usually without warning.
Rolling blackouts
Demand-driven cuts roll through the city, leaving your block dark while the next one keeps its lights on.
Voltage swings
Brownouts and surges quietly shorten the life of refrigerators, mini-splits, and electronics — the slow, expensive kind of damage.
No power, no water
Most SMA homes pump water up to a tinaco and run everything on Wi-Fi. When the grid drops, so do they.
What You Keep
When the grid drops, your home doesn't.
We size your system around what matters most to you. A typical whole-home backup keeps all of this running — seamlessly, without a flicker:
Backup Runtime
A typical home runs 4 to 12+ hours on battery — and far longer when paired with solar, which recharges the system through the day. We size it to how you actually live.
How Firefly Works
Always on watch. Nothing for you to do.
The Firefly hybrid system checks your power 60 times every second. The moment it detects a problem, it switches your home to battery — in under 20 milliseconds, faster than a lightbulb could flicker.
Normal
Grid and solar power your home and charge the LiFePO4 battery. The system cleans incoming power, protecting your appliances around the clock.
Outage
The instant CFE drops, your home switches to battery and solar — automatically. No switch to flip, no app to open, no interruption you would even notice.
Recharge
When the grid returns — or the sun comes up — the battery refills itself, ready for the next outage. You never have to think about it.
What's Included
A complete backup system, installed properly.
On-site power assessment — we measure your real loads and what you want backed up
System sizing — hybrid inverter (5–12 kW) and LiFePO4 battery (5–16 kWh) matched to your home
Professional installation of the inverter, battery, and electrical integration
Clean, code-compliant wiring and a dedicated backup panel
Solar-ready setup — add or integrate panels now or later
App setup and a full walkthrough of how your system behaves
Architect-supervised sign-off with full install documentation
Firefly is built by Nordic Electric — 20+ years in San Miguel de Allende. As authorized installers, we size, wire, and commission your system correctly the first time.
Our Process
Clear Steps. Zero Surprises.
The same process we use on every job — explained in English, documented in writing.
WhatsApp Us
Tell us about your home, your biggest power-outage frustrations, and what you most want kept running. We reply the same day.
Free Power Assessment
We visit, measure your real electrical loads, and recommend the right inverter and battery size. No charge, no obligation.
Written Quote
You receive an itemized quote in English — system size, what it backs up, runtime, and timeline. Flat price, no surprises.
Professional Install
Our team installs the Firefly inverter and battery, integrates the electrical, and configures the system — typically in one to two days.
Sign-Off
We walk you through how your system behaves, hand you the documentation, and you sign off only when everything is right.
Pair With
Build a Home That Runs No Matter What
Backup power is strongest as part of a resilient home. These are the services SMA homeowners pair with it.
What Our Clients Say
Trusted by Homeowners Across SMA
Gustavo has proven repeatedly that he knows how to manage a project by bringing the right team. They work until it is done right. He works tirelessly to design and redesign until the customer is happy in the end.
Arq. Gustavo Jiménez has completed several projects in my home. Gustavo is prompt, attentive, and communicates clearly and often during the project. His team are a pleasure to work with as they are focused on all the details to make the project successful, are punctual, reliable and polite.
Frequently Asked
Backup Power FAQ
Is this a generator or a battery?
Technically it is a battery backup system, not a fuel generator. But it does the job people buy a generator for — keeping your home powered when CFE drops — and does it better: silently, automatically, and with no fuel or fumes.
How is it better than a fuel generator?
No engine noise, no exhaust, no fuel to store or refill, no manual switch, and virtually no maintenance. It also works 24/7 — cleaning your incoming power and protecting your appliances — not just during outages.
How long does the battery last during a blackout?
A typical home runs 4 to 12+ hours on battery, depending on how much you keep running. Paired with solar, it can last far longer because the battery recharges during the day. We size it to your real usage.
Can it run my whole house, including air conditioning?
Yes — if the system is sized for it. Air conditioning is a heavy load, so we measure your real demand during the assessment and recommend an inverter and battery that comfortably cover what you want backed up.
What happens the moment the power goes out?
Nothing you need to do. The system detects the outage and switches your home to battery in under 20 milliseconds — faster than you can notice. No switch to flip, no app to open.
Is it noisy?
No. There is no engine and no moving parts to hear — the system is completely silent. That matters in San Miguel, where a roaring fuel generator is both a nuisance and a problem in the Centro Histórico.
Does it need fuel or maintenance?
No fuel, ever. The LiFePO4 battery and hybrid inverter are virtually maintenance-free — there are no oil changes, filters, or fuel runs like a combustion generator requires.
Does it work with solar panels?
Yes. Firefly is a hybrid system designed to work with solar. Panels recharge the battery through the day, extending your backup and lowering your CFE bill. You can add solar now or integrate it later.
Will it protect my appliances from voltage problems?
Yes. Beyond outages, the system continuously cleans and stabilizes your incoming power — protecting refrigerators, mini-splits, and electronics from the brownouts and surges that quietly shorten their life.
How long does installation take?
Most homes are installed in one to two days. We handle the inverter, battery, electrical integration, and a dedicated backup panel, then walk you through the finished system.
Ready When the Grid Is Not
Stop dreading the next blackout.
Free power assessment. Written quote in English. Authorized Firefly install, architect-supervised. Reach us on WhatsApp.
