Battery Backup Systems
Solar + Battery Backup Systems
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How does home battery backup work with solar?
Home battery backup systems in southwest Wisconsin start at approximately $10,000 for a basic AC-coupled unit and range to $25,000+ for full off-grid setups. Battery storage pairs with any solar configuration — grid-tied, hybrid, or off-grid — to provide backup power during outages, reduce peak electricity charges, and maximize solar self-consumption. Ethos Green Power installs FranklinWH, Enphase, SolArk, and Discover battery systems across Vernon, Crawford, La Crosse, and surrounding counties.
But every journey to energy independence looks a little different. Let us help you find the perfect fit.
How to Choose the Right Energy Storage System
Start with your goals. Ask yourself:
- What’s my primary objective? Backup during outages? Lowering energy bills? Full independence?
- Do I already have solar, or am I planning to install it?
- How reliable is my grid connection?
- What’s my energy usage during an outage?
Net metering policies vary by utility — Vernon Electric Cooperative, Xcel Energy, and Dairyland Power each have different rules for how battery-stored solar credits are applied.
A storm rolls in, the power flickers, and then everything goes dark—except your home. Your lights are on, the fridge is humming, and your heater is keeping things toasty.
This is your battery backup system at work. But how do you choose the right one?
What battery systems are available for Wisconsin homes?
#1 AC Coupled Battery System
Starting with the AC Coupled Battery System. If you already have solar panels—or don’t, but you’re looking for a simple, affordable way to keep the essentials powered—this might be your match.
Take the FranklinWH Battery, for instance. It’s a modular system, which means you can start with just one unit (a solid 13.6 kWh of storage) and add more as your needs grow. And here’s the beauty: it doesn’t need solar panels to function. You can use it as a standalone solution, or seamlessly pair it with an existing system. The downside? It’s not designed for huge energy demands, so if you’re planning to keep every light, appliance, and gadget running during an outage, you might need to scale up.
#2 Hybrid Solar and Battery System
Now, for those who are ready to embrace the full solar experience, there’s the Hybrid Solar and Battery Backup System. Recent technological developments and incentives for domestic batteries are beginning to yield smart economical options for someone just dipping their toes into solar storage. Depending on your energy use and utility policy, batteries let you play the energy game strategically: store power when the sun is shining and use it when electricity rates spike. And because they’re tied to the grid, you’re not entirely cut off; the system steps in only when you need it.
#3 Off-Grid Solar and Battery System
But let’s say you’re ready to leave the grid entirely—no backup safety net, just you and the power you produce. Enter the Off-Grid Solar and Battery System, featuring the SolArk Inverter and Discover Batteries. This setup is serious business. It’s not for the faint of heart, but for those who want total independence, it’s the gold standard. The SolArk inverter is like the quarterback of the operation, efficiently managing energy from your solar panels and batteries, while the Discover batteries provide scalable storage for even the most energy-intensive households.
It’s not without its challenges. Going off-grid requires maintenance and careful planning. But for the right person—a remote homeowner, a cabin in the woods, or someone who just doesn’t want to rely on the grid anymore—it’s the ultimate solution.
Which battery system is right for me?
Start with a simple question: what do you need? If you’re just looking for peace of mind during the occasional outage, the FranklinWH might be all you need. Want to save on bills and still have a solid backup? The Enphase 5P is ready to step in. And if you’re ready to go all-in on independence, the SolArk system has your back. Each of these systems has its own story, its own strengths, and its own quirks.
Let us help you discover which one fits into your needs.
How do home battery systems compare?
| Feature | AC Coupled (FranklinWH) | Hybrid (Enphase 5P) | Off-Grid (SolArk + Discover) |
|---|---|---|---|
| Best for | Outage backup, existing solar | Bill savings + backup | Full energy independence |
| Storage capacity | 13.6 kWh (expandable) | 5 kWh per unit (stackable) | Scalable to 40+ kWh |
| Requires solar? | No | Yes | Yes |
| Grid connection | Optional | Yes | No |
| Starting cost | ~$10,000 | ~$12,000 | ~$20,000+ |
| Maintenance | Minimal | Minimal | Regular monitoring needed |
What is the battery installation process?
- Needs Assessment — We evaluate your energy usage, backup priorities, and utility rate structure to recommend the right system.
- System Design — Custom engineering for your property, including electrical panel evaluation and battery placement.
- Permitting — We handle all permits and utility interconnection paperwork.
- Installation — Typical battery installations complete in 1–2 days. Combined solar + battery systems take 2–3 days.
- Inspection & Activation — Utility inspection, system commissioning, and grid interconnection.
- User Training — We walk you through the monitoring app, backup settings, and how to maximize your system.
Frequently Asked Questions About Battery Backup
How long will a battery power my home during an outage?
A single FranklinWH unit (13.6 kWh) can power essential circuits — refrigerator, lights, well pump, and internet — for 10–16 hours depending on usage. Multiple batteries extend runtime proportionally. With solar panels actively generating, a battery system can sustain essential power indefinitely during daylight hours.
Can I add batteries to my existing solar system?
Yes. AC-coupled batteries like the FranklinWH connect to any existing solar installation without modifying the original system. This is the most common retrofit we perform across southwest Wisconsin. The installation typically takes one day.
How long do home battery systems last?
Most lithium battery systems carry 10-year warranties and are rated for 6,000–10,000 charge cycles. At one cycle per day, that’s 15–25+ years of expected service life. Performance gradually decreases over time, similar to any rechargeable battery.
Are there incentives for battery storage in Wisconsin?
Commercial and agricultural battery systems may qualify for federal incentives when installed with solar. Wisconsin’s Focus on Energy program may offer additional rebates. Ethos handles all incentive paperwork.
Do battery systems require maintenance?
Lithium battery systems require minimal maintenance — no fluid checks, no moving parts. Ethos provides remote monitoring for all installations and lifetime technical support. Off-grid systems require more attention to ensure proper charge cycling.
Last updated: February 2026