Michigan homeowners don’t need to be told the grid is unreliable. Summer storms and winter ice storms knock out power across DTE and Consumers Energy territory every year, sometimes for days at a stretch. So it’s one of the first questions people ask about going solar: if the power goes out, will my panels keep my house running? The answer is important, and it surprises a lot of people. Let’s walk through exactly how solar behaves in an outage, what it takes to keep your home powered, and how to size it for a real Michigan storm.
The surprise: solar panels alone shut off in an outage
Here’s the part most homeowners don’t expect. A standard grid-tied solar system — panels and an inverter, no battery — turns off when the grid goes down, even in bright sunshine.
It’s not a flaw; it’s a safety feature required by code. If your panels kept pushing power onto the lines during an outage, they could energize wires that utility crews believe are dead, putting those workers at risk. So grid-tied inverters are required to detect the outage and shut down automatically. That means solar by itself won’t keep your lights on — the panels on your roof simply go dormant until the grid returns.
If backup power during outages is one of your reasons for going solar — and in Michigan, it usually is — you need to hear this clearly: panels alone won’t do it. You need a battery. This is the single most common misunderstanding we run into, and it’s better to know it now than to discover it during the next ice storm.
How solar + battery keeps you running
Add a home battery (like the Tesla Powerwall 3) and everything changes. When the grid drops, the battery instantly disconnects your home from the grid and powers your house from stored energy — safely, because you’re now “islanded” from the utility lines. Crucially, once you’re islanded, your panels are allowed to keep working, recharging the battery during daylight.
That combination is what actually delivers what people picture when they imagine solar backup: the lights stay on, the fridge keeps running, the furnace fan and sump pump keep working, and during the day your panels top the battery back up. In a multi-day Michigan outage, a solar-plus-battery home can keep cycling — charge by day, run through the night — long after a generator would have run out of fuel and long after your neighbors have lost what’s in their refrigerators.
Why that “recharge” piece matters so much
A battery on its own is a fixed bucket of energy. Once it’s drained, you’re waiting for the grid — the same as everyone else. Pair it with panels and the bucket refills every day the sun is up. That’s the difference between a battery that gets you through one evening and a solar-plus-battery system that can ride out a genuinely long outage. In a state where storms can leave whole neighborhoods dark for days, that daily recharge is the whole point.
Whole-home vs. essential-loads backup
There are two ways to set this up, and it’s worth understanding the difference before you size anything:
- Essential-loads backup. The battery powers a chosen subset of your home — typically the fridge, furnace fan, sump pump, internet, garage door, and some lights and outlets. It’s the most cost-effective approach and covers what matters most in an outage. For a lot of Michigan families, keeping the heat running and the basement dry is exactly what they’re after.
- Whole-home backup. With enough battery capacity (and sometimes more than one unit), you can back up essentially everything, including larger loads. The Powerwall 3’s built-in inverter and high power output make whole-home backup realistic for many Michigan homes.
Which one is right for you comes down to what you want to keep running and for how long — a conversation worth having before you commit to a system size.
Sizing for a Michigan outage
The right battery size depends on two things: how much power your backed-up loads draw, and how long you want to ride through. A short summer storm outage is a very different design target than a multi-day winter ice storm.
Two Michigan-specific realities shape the sizing:
- Winter outages are the hard case. They’re often the longest, they hit when your furnace fan and sump pump are must-haves, and shorter daylight means less solar recharge per day. If you’re planning for resilience, plan around the winter scenario, not the mild one.
- The sump pump is not optional. In much of Michigan, a basement without a working sump pump during a spring storm is a flooded basement. It’s frequently at the top of the essential-loads list for good reason.
When we size a backup system, we look at your specific essential loads and realistic Michigan outage durations, so you’re not caught short at hour 30 of a storm.
More than backup: the everyday payoff
Backup is the headline reason Michigan homeowners add a battery, but it’s not the only payoff. The same battery helps you get more value out of your solar day to day. Because Michigan’s Distributed Generation program credits the excess you export at a lower rate than the retail price you pay to buy power back, storing your own solar and using it yourself is worth more than sending it to the grid. A battery captures that difference. It can also help you sidestep DTE’s expensive on-peak hours.
So the outage protection is what you’ll be grateful for during the next storm; the everyday savings are the bonus that comes along with it.
A few quick questions
If I already have grid-tied solar, can I add a battery later? Often yes, though it’s usually simpler and more cost-effective to plan for it up front. It’s worth asking during the design so your system is battery-ready.
Will a battery run my whole house or just part of it? Either — it’s a sizing choice. Essential-loads backup is the budget-friendly path; whole-home backup takes more capacity.
How is this better than a gas generator? No fuel to store or run out of, no noise, no fumes, no manual startup — and it recharges from your roof every day. It also does double duty by saving you money year-round, which a generator never does.
The bottom line
Solar panels alone won’t keep your lights on in an outage — they shut off for safety. Solar plus a battery is what delivers real backup: it powers your home when the grid is down and recharges from your panels each day, which is exactly the resilience Michigan’s storm-prone grid calls for. Decide whether you want essential-loads or whole-home backup, size it for real Michigan outages, and you’ve got a home that keeps running when the neighborhood goes dark.
Ready to take control of your energy costs and protect your home from Michigan’s frequent outages? Request a free, no-obligation quote from Stellar Solar Michigan — serving Michigan homeowners with solar and battery storage since 1998, A+ rated with the BBB — or call 858-395-6905.