Exploring the FranklinWH aPower 2 and aPower S

Homeowners are asking for more control, more resilience, and more value from their solar investments. In our recent webinar with FranklinWH, BayWa r.e. unpacked how the aPower 2 (AC-coupled battery) and the new aPower S (all-in-one hybrid PV inverter + battery) help you design simpler, stronger, and more flexible solar + storage systems – while protecting your margins and your time.

Below are the key takeaways for residential installers, plus direct links to get the gear you need through the BayWa r.e. Webstore.

Recommended Use-Cases

• New builds/full replacements: Lead with aPower S for DC-coupled efficiency and lower labor time. Add aPower 2 for extra power and capacity without another inverter.

• Retrofits: Add aPower 2 to existing micro or string PV; or add aPower S + new PV to grow production and storage together.

Why aPower S is a Big Deal for New Solar + Storage

All-in-one architecture.
aPower S integrates a hybrid PV inverter and 15 kWh usable battery in one enclosure, cutting parts, conduit runs, and install time. It supports up to 20 kW DC across four MPPTs, each accepting 15 A per string with 600 V DC max and MPPT range of 90–480 V DC—giving you wide stringing flexibility for today’s modules.

Higher system efficiency.
DC-coupled PV to battery minimizes conversion losses and allows simultaneous DC (PV) and AC charging – useful for TOU arbitrage, EV load shifting, and storm prep.

Real-world power.
Continuous discharge is up to 11.5 kW when PV is producing, and 10 kW on battery-only – plenty for 240 V loads such as well pumps, mini-splits, ovens, and EV chargers.

Warranty built for longevity.
Each aPower S carries a 15-year warranty or 60 MWh throughput (70 % SOH at end of life). The unit is also warranted for off-grid use, with IP67-rated components in a Type 3R enclosure for outdoor installations.

When aPower 2 Is Still Your Move

If you’re pairing storage to existing PV (microinverters or string inverters), stay lean with the aPower 2 – a 15 kWh usable, AC-coupled battery that’s retrofit-friendly and compatible with most third-party PV inverters.

Mix and match.
You can expand an aPower S system with aPower 2 to add both power and capacity, or start with aPower 2 on an existing PV site and later add an aPower S plus new PV.

Quick reference specs (aPower 2):

• 15 kWh usable energy (1.1 kWh reserve for black-start)

• 10 kW continuous output / 15 kW 10 s peak / 8 kW charge power

• 120/240 V or 120/208 V single-phase compatible

• 15-year / 60 MWh warranty | Off-grid ready | Outdoor rated (IP67, Type 3R)

Code & Compliance—Today and Tomorrow

• Rapid Shutdown (RSD):
  aPower S is listed as PVRSS when installed with approved external RSD devices such as APsmart or Tigo. (Per webinar, FranklinWH is developing its own MCI RSD solution, target timeline 2026.)

• 208 V single-phase compatibility:
  Ideal for multifamily and larger homes using 120/208 V services.

BayWa r.e. Makes Procurement & Planning Easier

• Webstore built for installers: Real-time stock and shipping estimates, team-cart tools, and badges for U.S.-manufactured products keep projects on track.

• Forecasting & account support: Dedicated account managers and a national warehouse network ensure timely deliveries and consistent pricing.

• Job-site delivery: Ship direct to site to cut handling time and keep your crews productive.

Quick Spec Cheat Sheet

Ready to Quote or Order?

Need support with forecasting, logistics, or system design? Your BayWa r.e. account manager is ready to help you scope the right FranklinWH solution for your next project.