FranklinWH vs Enphase IQ Battery: 2026 aPower S vs 10C Comparison

Choose FranklinWH aPower S when a 15-kWh unit, higher published battery-only power, direct solar inputs, documented generator charging, and aGate source control fit the design. Choose Enphase IQ Battery 10C when a current fourth-generation Enphase architecture, 10-kWh expansion steps, embedded battery microinverters, and Combiner 6C controls fit better. Neither brand wins automatically for an existing Enphase solar home because the exact microinverters, gateway, prior batteries, backup interface, utility, and service provider can reverse the answer.

This comparison matches two current U.S. products as of August 10, 2026: FranklinWH aPower S, SKU APRS-10K15V1-US and nameplate aPower S-10, against Enphase IQ Battery 10C, model IQBATTERY-10C-1P-NA. It does not blend aPower 2, aPower X, IQ Battery 5P, IQ Battery 10T, or the announced IQ Battery 10CS into their specifications.

Why aPower S rather than aPower 2? Search results often use aPower 2 because it was the common 2025 comparison. FranklinWH’s current document center identifies aPower S as a separate U.S. product, its February 2026 data sheet adds a hybrid inverter and direct PV inputs, and its August 2026 installation guide supplies the current design path. aPower 2 remains a separate current AC-coupled product and may still deserve a quote for some retrofits. A seller may not substitute its specifications into this page.

Teamsun offers battery storage design and installation in Connecticut, Massachusetts, and Rhode Island and has a commercial interest in storage projects. The live service page names FranklinWH and an older Enphase battery generation, but that does not verify current aPower S or IQ Battery 10C supply, authorization, commissioning access, price, or support. Confirm each item for the address in writing.

Direct answer: Put aPower S first on the quote list when one unit’s 15 kWh, 10-kW battery-only output, four direct-PV MPPTs, aGate controls, and a released generator path solve the job. Put IQ Battery 10C first when 10-kWh increments, fourth-generation Enphase solar integration, distributed battery microinverters, and Combiner 6C controls solve it. Quote both only after the same loads, one-line, winter location, program assumptions, warranty labor, and service duties are fixed.

To compare both systems against one scope, discuss battery storage options with Teamsun. Ask for exact models, quantities, controller and transfer hardware, protected loads, settings, site work, commissioning, warranty documents, and post-install service in the proposal.

What specifications are comparable between aPower S and IQ Battery 10C?

One aPower S publishes more usable energy and more continuous output than one IQ Battery 10C, but its 11.5-kW figure includes a PV-input condition. Enphase publishes continuous output in kVA and current over stated durations. Preserve those units and conditions instead of creating a synthetic “peak kW” ranking.

Decision field	FranklinWH aPower S	Enphase IQ Battery 10C
Exact current U.S. model	SKU APRS-10K15V1-US; nameplate aPower S-10	Model IQBATTERY-10C-1P-NA; two 5-kWh units under one cover
Architecture	Hybrid-coupled battery/inverter with four direct-PV MPPTs; system design uses aGate or another documented controller path	AC-coupled battery with four embedded grid-forming microinverters; fourth-generation design uses IQ Combiner 6C
Published usable energy	15 kWh	10.0 kWh
Maximum charge power	8 kW continuous under data-sheet conditions	Quote from configured system design; data sheet centers its output and AC/DC efficiency values
Continuous discharge	10 kW battery-only; up to 11.5 kW with PV input on the applicable nameplate	7.08 kVA and 29.5 A for balanced 240-V line-to-line loads; do not silently relabel kVA as kW
Short-duration evidence	15 kW for 10 seconds; 25 kW for one second; 185 A LRA	56 A for three seconds; 44.8 A for 10 seconds; up to 90 A LRA
Expansion maximum	15-kWh increments; manufacturer states up to 15 units and 225 kWh per aGate	10-kWh increments; up to eight 10Cs and 80 kWh using the documented oversubscription path
Chemistry	Lithium iron phosphate	Lithium iron phosphate

Sources: FranklinWH aPower S data sheet, FranklinWH aPower S/aGate installation guide, and Enphase IQ Battery 10C data sheet.

The table is not a runtime estimate. Energy in kWh helps answer how long loads may run; continuous power or apparent power limits what can run together; short-duration current and LRA help evaluate motor starting. A heat pump, well pump, air conditioner, resistance heater, range, dryer, or EV charger needs its actual nameplate and operating sequence tested against the complete system.

Use blank calculations only:

Planning energy (kWh) = sum of average load kW × intended operating hours

Required delivered energy = planning energy + documented reserve and modeled temperature, conversion, and aging allowances

Actual duration depends on state of charge, cycling loads, temperature, age, controls, solar, snow, program dispatch, and occupant behavior. The dedicated whole-home sizing page owns the deeper calculation; this page uses loads only to choose which architecture deserves a proposal.

How do the architectures change a new solar project or retrofit?

aPower S has the more direct new-solar path of the pair. Its hybrid inverter accepts direct PV through four MPPTs, with a published 20-kW maximum solar STC input and 15-kW maximum continuous total MPPT output. Array voltage, current, rapid-shutdown equipment, roof planes, service rating, utility limits, and the exact nameplate output still control the design.

The direct-PV feature is not automatically used in an existing-solar retrofit. Existing Enphase or other AC solar may remain on an AC integration path through a supported FranklinWH design, while new PV may land on aPower S. FranklinWH publishes a broad Enphase compatibility statement and a PV-curtailment paper, but a contract still needs every existing microinverter, gateway, current transformer, firmware version, branch, interconnection record, and supported one-line. “Works with Enphase” is not an equipment schedule (FranklinWH Enphase compatibility orientation).

IQ Battery 10C is AC-coupled and belongs to Enphase’s fourth-generation system. It requires IQ Combiner 6C. Backup requires IQ Meter Collar; Enphase says the battery and combiner can operate without that collar, but the site will not have backup. The system supports specified IQ- and M-series solar paths, but it is not a drop-in addition to every Enphase-branded site.

Enphase says 10C cannot use an older IQ Gateway or older IQ Combiner. Certain IQ-series PV can migrate into Combiner 6C; M-series PV must remain with IQ Gateway Metered and connect through the documented control route. Existing IQ Battery 3/3T, 10/10T, or 5P cannot directly integrate with 10C and must remain on separate architecture (Enphase fourth-generation FAQ).

Existing condition	aPower S proof required	IQ Battery 10C proof required
No solar yet	Direct-PV string/MPPT plan, rapid shutdown, aGate/controller, service and backup one-line	Exact IQ PV branches, Combiner 6C, Meter Collar, service and backup one-line
Existing Enphase PV only	Exact AC integration and curtailment design; app/metering ownership; old gateway treatment	Exact microinverter compatibility; gateway/combiner migration; branch and metering plan
Existing Enphase battery	Franklin design must coexist without unsupported control conflicts	Older battery remains separate; no direct 5P/10C or earlier-generation mixing
Existing string inverter	Exact manufacturer-supported AC path, metering, export behavior and service chain	Exact third-party/uncontrolled PV path and Combiner 6C limits

For an existing array, the relevant project path is battery retrofit design. That service link does not prove either exact model or mixed-equipment configuration is available or supported.

Which system better supports 120/240 V loads, expansion, and load control?

aPower S publishes the stronger single-unit load-start case; IQ Battery 10C offers smaller energy increments and specific fourth-generation load-control routes. Neither maximum-system number proves that every unit can deliver its nameplate output simultaneously through the service, controller, conductors, or utility connection.

FranklinWH lists nominal 120/240 V and 120/208 V, a 5-kW maximum half-wave load capability, 100% load-imbalance ratio, 15 kW for 10 seconds, 25 kW for one second, and 185 A LRA. Those values still require the applicable aPower nameplate, configured breaker/output, motor data, other simultaneous loads, and controller design. They are not permission to run every 120-V load on one leg.

Enphase publishes 7.08 kVA and 29.5 A for balanced 240-V line-to-line loads. Its footnote says a maximum 24 A of 120-V line-to-neutral unbalanced load can be supported along with 5.5 A of 240-V line-to-line load. That specific simultaneous condition is more useful than a generic “split-phase capable” label. A proposal should show the 120-V leg balance, 240-V motors, neutral, start current, and load-shedding sequence.

The balance-of-system comparison matters as much as the battery count:

Function	FranklinWH path	Enphase path
Grid isolation/energy control	Exact aGate or other current Franklin controller shown on one-line	IQ Meter Collar for backup plus IQ Combiner 6C
Managed loads	Optional aGate Smart Circuits module publishes two 120-V circuits and one 240-V circuit	Combiner 6C includes a path for up to 64 A continuous load control or legacy/third-party PV; other relay features must be released and supported
Expansion	Up to 15 aPower units per aGate in data sheet; site limits can be lower	Two battery breakers; up to two 10Cs per breaker normally or four with battery-oversubscription controls, for eight total
Generator	FranklinWH documents an optional aGate generator connection that can supply loads and recharge aPower	Current Enphase FAQ says IQ Battery 10C generator integration is not supported

FranklinWH’s current generator guidance describes manual or scheduled operation and charging through an optional aGate connection. That is a real manufacturer pathway, not universal generator compatibility. Fix the generator make/model/controller, start method, voltage sensing, fuel, power, transfer sequence, firmware, exercise behavior, permits, and commissioning test.

Enphase describes an IQ Smart Switch expected in 2026, but its current FAQ still answers “No” to 10C generator integration. An announced accessory earns zero score until it has an orderable model, final manual, compatibility list, local availability, approved one-line, utility/AHJ acceptance, and commissioning support.

Which has the better New England placement and efficiency case?

Neither wins from a minimum-temperature headline. aPower S documents an integrated heater and a wide operating band; IQ Battery 10C publishes unusually clear full-power temperature bands. The site should be designed from derating, snow/access, and service conditions—not only the lowest printed temperature.

Siting or efficiency field	aPower S	IQ Battery 10C
Maximum operating band	-4°F to 122°F; operation to 131°F at derated output	Charging -4°F to 122°F; discharging -4°F to 131°F
Full-power/conditioning detail	Data sheet identifies a built-in heating blanket but does not publish a complete site-specific cold output curve	Maximum charging power 59°F–113°F; maximum discharging power 32°F–122°F; reduced power outside those bands
Mounting/enclosure	Wall or floor; NEMA 3R, with IP67 battery pack and inverter; 388 lb	Wall or optional pedestal; NEMA 3R; 317 lb installed, with 125-lb maximum lifting package
Dimensions	45.2 × 29.5 × 11.8 inches	24.5 × 28 × 14.4 inches
Published efficiency	90.5% solar-to-battery-to-load at beginning of life, 77°F and 3-kW charge/discharge	90% AC-to-battery-to-AC at 50% power rating; 96% DC battery RTE also published

Sources: aPower S data sheet, IQ Battery 10C data sheet, and Enphase battery temperature guidelines.

The efficiency numbers do not share the same endpoints. Franklin’s 90.5% begins with solar and ends at load under a defined test; Enphase’s 90% measures the AC battery round trip and excludes a separate solar conversion upstream. Do not subtract 90 from 90.5 and predict annual savings. Ask for the measurement boundary, test power and temperature, auxiliary use, part-load behavior, and one project model using identical load and solar inputs.

A New England site plan should document winter design temperature, expected charge/discharge derating, heater or conditioning energy, direct sun, snow and ice clearance, drainage, flood exposure, vehicle impact, wall/foundation capacity, ventilation, communications, and service access. B132 owns the detailed cold-weather comparison; this section is only a pass/fail placement gate.

How do warranty, monitoring, connectivity, and field service differ?

Both battery headlines say 15 years, but Franklin uses a 60-MWh throughput endpoint and 70% retention; Enphase uses a 6,000-cycle endpoint, 70% at year 10, and 60% at the final endpoint. Years alone cannot identify the better warranty.

Warranty/service field	FranklinWH aPower S	Enphase IQ Battery 10C
Current U.S. document	FranklinWH System Limited Warranty, effective May 2026	Enphase Storage Systems Limited Warranty, effective November 1, 2025
Battery endpoint	15 years or 60 MWh aggregate throughput, whichever first	15 years or 6,000 discharged cycles, whichever first
Capacity retention	At least 70% of 15 kWh at the controlling endpoint	At least 70% of nameplate at year 10 and 60% at end of limited-warranty period
Purchase/install condition	Authorized reseller and FranklinWH-certified installer; installation/manual conditions apply	Enphase or authorized reseller; use and Enphase-document conditions apply
Registration/connectivity	Registration and consistent internet affect full coverage; unresolved extended disconnection can reduce the stated term	45-day registration language with express state-law exception; continuous internet is requested for diagnostics/updates
Claim route	Original certified installer/reseller first; FranklinWH direct support if unavailable	Enphase RMA procedure; claim during term and within 90 days after defect discovery
Labor boundary	Repair, replacement or depreciated refund remedies do not prove every local labor/travel/access cost	Warranty expressly excludes uninstall, reinstall, and electrical-system removal/installation/troubleshooting labor

Read the FranklinWH May 2026 warranty and Enphase November 2025 10C warranty, then attach the exact versions to the contract. The solar warranty comparison guide explains why product, retained-capacity, installer-workmanship, and labor promises must remain separate.

FranklinWH uses the FranklinWH App and its controller communications path. Enphase publishes wired control communication, IQ Gateway functions in Combiner 6C, Enphase App and Installer Platform monitoring, and API integration. Those are feature descriptions—not proof of uptime, app preference, cellular coverage, data retention, cybersecurity outcomes, or local response.

Require a service matrix naming who sees an alert, has owner-authorized remote access, opens a case, supplies diagnostic evidence, pays labor/travel/shipping/access, replaces each component, restores monitoring and program enrollment, and assumes support if the original installer exits the brand. Teamsun support for either exact model is unverified; evaluate the actual contractor with the battery-installer scorecard.

Are aPower S and IQ Battery 10C on current CT, MA, or RI program lists?

Connecticut lists both exact model families as of June 5, 2026. Massachusetts and Rhode Island list FranklinWH and Enphase at the manufacturer or partner level. None of those pages guarantees an address-specific application, incentive, enrollment, dispatch result, or payment.

Program	Current evidence	What remains unproven
Connecticut Energy Storage Solutions	Exact list includes FranklinWH aPower S and Enphase IQ Battery 10C	Final DERMS integration, eligible contractor, customer, reservation, interconnection, settings, program acceptance and payments
Massachusetts ConnectedSolutions	Mass Save lists FranklinWH and Enphase among participating manufacturers/inverters	Exact SKU, sponsor/customer eligibility, implementer enrollment, dispatch, current terms and payment
Rhode Island ConnectedSolutions	Rhode Island Energy lists FranklinWH and Enphase as approved battery partners	Exact SKU, service territory, application, implementer, interconnection, dispatch and future program status

Sources: Connecticut exact eligible-equipment list, Mass Save battery storage, and Rhode Island Energy battery program.

Program participation changes battery use. Put event schedule, reserve floor, opt-out rights, data access, performance measurement, payment recipient, vendor fee, cycling, warranty treatment, transfer, and exit terms beside the product score. Use Teamsun’s Connecticut storage guide and Massachusetts battery-program guide only as orientation; current official documents and a written application control.

Use this matched-use-case FranklinWH versus Enphase scorecard

Score the complete configured proposal, not the battery logo. Apply four hard gates first: supported one-line, passed load/start calculation, approved winter location, and verified local commissioning/service route. A proposal that fails a gate is paused regardless of points.

Matched use case	Weight	aPower S earns full credit when…	IQ Battery 10C earns full credit when…
New solar architecture	15	Direct-PV strings, four MPPTs, rapid shutdown, aGate and service design all fit	Exact Enphase PV branches, Combiner 6C and Meter Collar create the simpler approved design
Existing solar retrofit	15	Exact AC integration, curtailment, metering and legacy gateway plan are documented	Exact Enphase PV generation can migrate or coexist under the fourth-generation matrix
Loads and motor start	20	Configured output, 120-V imbalance, 240-V loads and 185-A-LRA case pass	Configured kVA, leg balance, duration currents, 90-A-LRA case and controls pass
Outage energy	10	15-kWh increments meet the same downside energy case	10-kWh increments meet the same downside case without oversubscription surprises
Source/load control	10	Released aGate generator and Smart Circuits design matches the required sources/loads	Combiner 6C load-control path matches the required circuits; no announced feature is scored
Placement and winter	10	Heater, derating, mounting, weight, clearances and service access pass	Full-power temperature bands, mounting, weight, clearances and service access pass
Warranty and service	10	60-MWh endpoint, 70% retention, registration/connectivity and local labor route are accepted	6,000-cycle endpoint, 60% final retention, registration/transfer and excluded-labor route are accepted
Program and contract	10	Exact equipment, DERMS/implementer and complete installed scope are verified	Exact equipment, DERMS/implementer and complete installed scope are verified
Total	100	Score only attached evidence	Score only attached evidence

Matched conclusions:

• Quote aPower S first for a supported new direct-PV design, a higher-energy/higher-power base unit, or a currently documented generator-charging requirement.
• Quote IQ Battery 10C first for a supported fourth-generation Enphase design where 10-kWh increments, Combiner 6C, Meter Collar and the Enphase monitoring/control path fit.
• Quote both for an existing Enphase PV-only home only after each exact migration or coexistence one-line is available.
• Pause or quote another system if the home has an older Enphase battery that cannot mix, neither load case passes, the winter site fails, or no verified service company will own the exact configuration.

Do not add a price category until both proposals use the same protected loads, energy target, solar scope, controller, transfer/load-control hardware, service or panel work, site work, permits, interconnection, program work, commissioning, monitoring, financing basis, warranty labor, and restoration. No verified same-address Teamsun quote set was available, so this article publishes no installed-price winner.

If you want bidders held to this scorecard, send Teamsun your bills, load nameplates, solar records, generator information, panel photos, preferred location, and competing proposal.

FranklinWH vs Enphase FAQ

Is FranklinWH aPower S better than Enphase IQ Battery 10C?

Not universally. aPower S publishes more energy and battery-only continuous output per unit, direct PV inputs, and a released generator route. IQ Battery 10C offers current fourth-generation Enphase architecture, 10-kWh increments, distributed microinverters and Combiner 6C controls. The installed load and architecture decide.

Why compare aPower S instead of aPower 2?

aPower S has a separate current U.S. SKU, February 2026 data sheet, direct-PV hybrid inverter and current installation guide, making it the cleaner current match for this 2026 article. aPower 2 remains a separate AC-coupled model that may fit some retrofits; do not mix its specifications with aPower S.

Does one aPower S store more energy than one IQ Battery 10C?

Yes. Franklin publishes 15 kWh usable per aPower S; Enphase publishes 10.0 kWh total and usable per 10C. That five-kWh difference does not predict runtime until the loads, reserve, temperature, losses, age and solar recharge are modeled equally.

Which battery has more continuous power?

aPower S publishes 10 kW battery-only and up to 11.5 kW with PV input under applicable conditions. IQ Battery 10C publishes 7.08 kVA at 240 V. The different units, power factor, leg balance, configuration and load-start conditions must be preserved.

Can either battery start a central air conditioner or well pump?

Possibly. aPower S publishes 185 A LRA; IQ Battery 10C publishes up to 90 A LRA. A designer still needs the motor’s actual LRA/start profile, soft-start or variable-speed controls, running load, 120/240-V behavior, other simultaneous loads, temperature and configured battery count.

Can FranklinWH work with existing Enphase microinverters?

FranklinWH publishes an Enphase compatibility route, but a buyer should require the exact microinverter, gateway, metering, curtailment, firmware, interconnection and aGate design. A manufacturer-level compatibility statement is not a promise that every generation or site works unchanged.

Can IQ Battery 10C use my existing Enphase gateway or IQ Battery 5P?

Not directly. Enphase says 10C requires IQ Combiner 6C and cannot use older gateways/combiners. It also cannot directly integrate with 5P or earlier Enphase battery generations; those batteries must remain on separate architecture.

Which system works with a standby generator now?

FranklinWH documents an optional aGate generator path that can power loads and recharge aPower under a supported design. Enphase’s current FAQ says 10C generator integration is not supported. Do not count an expected IQ Smart Switch until it is released and approved for the project.

Which battery is better for outdoor winter installation?

Neither wins from minimum temperature alone. Both publish operation to -4°F, while Enphase provides explicit reduced-power bands and Franklin identifies a built-in heater. Compare site-specific derating, conditioning energy, snow/ice clearance, exposure, mounting and service access.

Which battery has the better warranty?

It depends on expected use and service terms. Franklin offers 15 years or 60 MWh with 70% retention. Enphase offers 15 years or 6,000 cycles, 70% at year 10 and 60% at the endpoint. Registration, connectivity, labor, transfer, remedies and local service can matter more than the headline.

Are both exact batteries listed for Connecticut Energy Storage Solutions?

Yes, on the official list dated June 5, 2026. Final DERMS integration, contractor, customer, application, interconnection, configuration, reservation and program approval remain separate gates.

Does Teamsun install or service aPower S and IQ Battery 10C?

This article does not establish that. Verify current exact-model supply, manufacturer authorization, design and commissioning access, program implementer status, warranty intake and post-install service directly before contracting.

Research method, cannibalization boundary, and limitations

Research was completed August 10, 2026. Product facts came from current FranklinWH and Enphase U.S. data sheets, warranties, installation/design documentation, compatibility FAQs, temperature guidance, generator materials, controller information, and service routes. Program facts came from Connecticut Energy Storage Solutions, Mass Save, and Rhode Island Energy.

Representative 2026 search results commonly match Enphase 10C against aPower 2, state universal winners, convert kVA/current into unsupported peak kW, call broad AC coupling universal, compare efficiency percentages with different endpoints, quote local prices without equal scope, or treat Enphase’s announced generator accessory as available. Reddit discussions surfaced useful buyer questions about keeping existing Enphase equipment, app ownership, generator charging, commissioning, expansion and warranty labor. No forum statement supports a specification, price, reliability claim, safety conclusion or recommendation here.

B138 owns the direct current aPower S-versus-10C, matched-use-case buying decision. The best home battery guide owns the broad four-model shortlist; B132 owns cold-weather depth; B133 owns whole-home sizing; the Tesla-versus-Enphase comparison owns that pair; the retrofit service and planned product retrofit pages own implementation detail; and the battery-installer guide owns contractor selection.

No verified Teamsun aPower S or IQ Battery 10C authorization, availability, installed quote, load calculation, commissioning record, outage or winter result, program enrollment, service record, warranty claim, or customer case was available. None was claimed. Manufacturer documents, firmware, accessories, utility approvals, program lists and contractor standing can change.

Choose only after the exact models, current documents, one-line, load study, site, utility/program path, commissioning party, warranty labor, service owner, and signed installed scope pass review. For an address-specific FranklinWH versus Enphase comparison, contact Teamsun to discuss battery storage options.