Home batteries
FranklinWH aPower S installation
The FranklinWH aPower S is a 15 kWh home battery with a solar inverter built in. One unit can back up a whole home, and it is built to keep working through Midwest winters. Wolf River Electric installs aPower S with new solar or on its own across Minnesota, Wisconsin, Iowa, Illinois, North Dakota and South Dakota.
Updated
Why aPower S
Whole-home backup in one battery
aPower S combines the battery and the solar inverter in one cabinet, so a new solar and storage system needs less equipment on your wall.
15 kWh in one unit
Enough stored energy to carry most homes through an outage with a single battery. Add more units later if you need them.
Solar inverter built in
Four built-in solar inputs take up to 20 kW of panels directly, with no separate solar inverter.
Built for cold weather
A built-in heating blanket keeps it working in the cold. It is rated to run from -4°F to 122°F.
15-year warranty
FranklinWH covers aPower S for 15 years or 60 MWh of energy throughput.
Specs
FranklinWH aPower S at a glance
| Usable energy | 15 kWh per battery. Up to 15 batteries on one aGate, with up to 8 of them aPower S. |
| Power | 11.5 kW continuous with solar, 10 kW from the battery alone, 15 kW peak for 10 seconds |
| Motor starting | 185 A locked-rotor amps, for loads like well pumps and air conditioners |
| Solar input | Up to 20 kW of panels, 4 MPPTs, 60 to 600 V DC |
| Efficiency | 90.5% round trip |
| Chemistry | Lithium iron phosphate (LFP) |
| Temperature | Runs from -4°F to 122°F, with reduced output up to 131°F |
| Weather rating | IP67 battery and inverter, Type 3R enclosure, indoor or outdoor |
| Size and weight | 45.2 x 29.5 x 11.8 in, 388 lb, wall or floor mount |
| Noise | 30 dBA typical |
| Warranty | 15 years or 60 MWh throughput |
Specs from the FranklinWH aPower S datasheet. Your design depends on your loads, panel and utility.
Works with
aGate, generators and smart panels
aPower S runs through the FranklinWH aGate, which switches your home to battery power in an outage and can also manage a standby generator. It works alongside FranklinWH aPower 2 batteries and SPAN smart panels, and you monitor everything in the FranklinWH app.
How much does a FranklinWH battery cost?
A FranklinWH aPower S with the aGate, fully installed by Wolf River Electric, runs about $15,400 to $22,000 (as of October 2026). The low end is with a prepaid lease, which many homeowners qualify for. The high end is buying it outright.
About $15,400
With a prepaid lease
About $22,000
Buying it outright
What the price includes
- Site survey
- System design and integration
- Permits
- Utility interconnection
- Battery rebate paperwork, if a program applies
- aGate (automatic transfer switch) installation
- Breakers and wiring
- Installation by our own licensed crews
- Project management from start to finish
It is a full white glove service: we handle every step from the first visit to turning the system on. If your home needs an electrical panel or service upgrade, that is priced separately. See battery rebates and utility bonuses that can lower the cost, or get a battery quote.
How it works
From quote to backup power
Load check
We review your usage, your panel and the loads you want backed up.
Design
We size the battery and solar and pick where the equipment goes.
Permit and utility
We pull permits and handle the utility paperwork.
Install
Our licensed electricians install the battery and aGate and test the backup.
App setup
We set your backup priorities with you in the FranklinWH app.
FranklinWH battery questions
How long will an aPower S run my home in an outage?
It depends on what you run. One 15 kWh battery can cover essentials like the furnace blower, refrigerator, well pump, lights and internet for many hours, and longer when solar recharges it during the day. We size the system from your actual usage.
Can I add aPower S to my existing solar?
In many cases, yes. aPower S can take new panels directly through its built-in inverter or work with an existing system through the aGate. We check your current equipment first.
Does it work in a Minnesota winter?
Yes. aPower S has a built-in heating blanket and is rated to run from -4°F. We install it in a garage or on an outside wall based on your site.
What warranty comes with aPower S?
FranklinWH covers aPower S for 15 years or 60 MWh of energy throughput. Our workmanship warranty covers the installation.
Are there incentives for home batteries?
Some utility programs and state rebates can lower the cost of a battery, depending on where you live. We check what applies to your home when we quote.