Free freight on backup kits over $8,000 Ships from CA Warehouse: 4277 Schaefer Ave,Chino,CA 91710 . Self-pickup available ( Will Call ) UL/CEC documentation included for permit review
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Whole-home or Partial-home solar battery backup

Solar & Battery Backup Kits

Compare four matched home battery backup systems with inverter, battery, transfer equipment, product documentation, and a clear path for DIY or electrician installation.

Use the selector to narrow the choice by existing solar, outage loads, and installation path. Then compare price, usable capacity, output, coupling type, warranty, and best-fit application in one table.

Find my kit Compare all kits
Fox ESS PowerQ 20 kWh home energy storage system Fox ESS PowerQ Growatt MIN 11400TL-XH and APX 20 kWh whole home backup kit Growatt APX Kit FranklinWH aPower 2 with aGate whole home energy solution FranklinWH aPower 2 Sigenergy SigenStor home energy system with LoadHub Sigenergy SigenStor

Which kit fits your house?

Answer the first two questions for a match. The third question adjusts the installation guidance.

01 - Do you already have solar?
02 - What must stay on?
03 - Who will install it?
Answer question 1 and question 2 to see the best starting point.

For retrofit projects

AC-coupled systems such as FranklinWH usually keep the existing solar inverter in place, which can simplify a battery-only upgrade.

For new solar plus storage

DC hybrid systems such as Growatt can reduce conversion steps when panels and storage are designed together from the start.

For future load growth

Expandable systems such as Sigenergy make sense when EV charging, heat pumps, or longer outage coverage may be added later.

Compare home battery backup kits side by side

The rows below are structured for quick shopping and crawler-friendly extraction: price, capacity, output, coupling, existing-solar fit, expansion, warranty, certification, freight, and best use case.

Specification Fox ESS PowerQ Growatt APX Kit FranklinWH Sigenergy SigenStor
Price$9,999$11,056$11,329$6,178 - $21,953
Cost per kWh$500$553$755$1,026 to $405
Battery capacity20 kWh20 kWh15 kWh6.02 - 54.24 kWh
Continuous output11.4 kW11.4 kW10 kW11.5 kW
Coupling typeAC + DCDC hybridAC-coupledAC + DC
Existing solar fitYesBest when replacing or adding inverterYes, keeps existing inverterYes
Expandable laterTo 40 kWhTo 40 kWhAdd more aPower unitsTo 54.24 kWh
Warranty10 years10 years15 years10 years
CertificationUL 9540, CEC listedUL 9540, CEC listedUL 1741 / UL 9540A, CEC listedUL 9540, CEC listed
FreightFreeFreeFreeFree
Best forLowest $/kWhNew solar + storageSolar retrofitRoom to grow

Four matched solar battery backup systems

Each card names the major components, the install notes to check before ordering, and the best product page for purchase or configuration.

Fox ESS PowerQ AIO 11.4-EQL5 20 kWh backup kit
Lowest cost per kWh
Fox ESS

PowerQ All-in-One, 20 kWh

A compact all-in-one home energy storage system for whole-home backup with AC and DC coupling flexibility.

Output
11.4 kW
Storage
20 kWh
Coupling
AC + DC
Warranty
10 yr
$9,999$13,295
$500 / kWh at the listed 20 kWh configuration.
  • PowerQ 11.4 kW hybrid inverter with integrated battery cabinet
  • Fox Hub G2 transfer gateway for whole-home backup
  • Monitoring, CT clamps, mounting hardware, and product documentation
  • UL 9540 certification and CEC listing for permit review
Check before orderingPlan for conduit, wire, service-panel tie-in, and a licensed electrician where required by your AHJ.
In stock - freight shipping available
View Fox ESS kit Ask an engineer
Growatt 20 kWh whole-home backup system kit
Best for new solar + storage
Growatt

MIN 11400TL-XH + APX, 20 kWh

A DC hybrid whole-home backup kit pairing an 11.4 kW storage inverter with a 20 kWh APX high-voltage battery and SYN transfer equipment.

Output
11.4 kW
Storage
20 kWh
Coupling
DC
Warranty
10 yr
$11,056$13,629
$553 / kWh at the listed 20 kWh configuration.
  • Growatt MIN 11400TL-XH-US V3 11.4 kW storage inverter
  • Growatt APX 20 kWh high-voltage battery stack
  • SYN 200-XH-US 11A whole-home backup transfer equipment
  • UL 9540 certification and CEC listing for permit review
Check before orderingThis is the strongest starting point when panels, battery, and inverter are designed together.
In stock - freight shipping available
View Growatt kit Ask an engineer
FranklinWH aPower2 and aGate whole home energy solution
Best for solar you already own
FranklinWH

aPower 2 + aGate, 15 kWh

An AC-coupled home battery backup system that can retrofit onto many existing solar installations without replacing the current inverter.

Output
10 kW
Storage
15 kWh
Coupling
AC
Warranty
15 yr
$11,329$14,698
$755 / kWh with the longest warranty in this comparison.
  • aPower 2 battery, 15 kWh class energy storage
  • aGate smart transfer and energy management controller
  • Generator input and smart circuit control capability
  • UL 1741 / UL 9540A documentation and CEC listing support
Check before orderingConfirm the interconnection plan with your electrician before the aGate is landed between meter and panel.
In stock - freight shipping available
View FranklinWH kit Ask an engineer
Sigenergy SigenStor home energy system with LoadHub
Best if loads will grow
Sigenergy

SigenStor with LoadHub, 6-54 kWh

A modular split-phase hybrid backup system that starts at 6.02 kWh and can expand to 54.24 kWh for larger loads or longer outages.

Output
11.5 kW
Storage
6-54 kWh
Coupling
AC + DC
Warranty
10 yr
$6,178to $21,953
$1,026 / kWh at 6 kWh to $405 / kWh at 54 kWh.
  • SigenStor 11.5 kW split-phase hybrid inverter/controller
  • Stackable 6.02 kWh and 9.04 kWh battery module options
  • LoadHub for whole-home backup and load control
  • UL 9540 certification and CEC listing for permit review
Check before orderingChoose module count from outage goals, evening load, and future EV or heat pump plans.
In stock - multiple configurations available
Choose Sigenergy configuration Ask an engineer

Shipping, pickup, and installation paths

Battery kits are heavy freight products. This page makes delivery and install expectations clear before a shopper reaches checkout.

Free shipping over $8,000 for Contiguous United States

$0

Free shipping (LTL freight) to the continental US with liftgate service included for these backup kits.

Chino, CA Self Pick-UP (Will Call )

4277 Schaefer Ave,Chino,CA 91710

Local buyers can arrange warehouse pickup at Chino, CA, after order confirmation.

Install support

3 paths

DIY with documentation, your electrician with engineering support, or an certified installer introduction by ZIP code. Need Installation Service?

Questions before ordering a solar battery backup kit

Can these kits work for whole-home backup?

Yes, but the final answer depends on service size, critical loads, transfer equipment, and local code. The kits above are designed for whole-home backup use cases, and Self2Solar can help review your panel photo, utility bill, and load goals before purchase.

Which kit is best if I already have solar?

FranklinWH is often the cleanest retrofit path because it is AC-coupled and can keep many existing solar inverters in place. Fox ESS and Sigenergy can also work with existing solar, depending on the interconnection design.

Which kit is best for new solar plus storage?

Growatt is the strongest starting point for a new solar plus storage design because the MIN 11400TL-XH inverter and APX battery are planned as a DC hybrid system from the beginning.

How much battery capacity do I need?

Most homes should size storage around evening load, outage priorities, and whether air conditioning, EV charging, or heat pumps need coverage. Send twelve months of bills and a main-panel photo for a practical sizing review.

Do incentives or tax credits apply?

Incentive rules change by date, location, installation type, and taxpayer situation. Use current IRS, state, utility, and SGIP guidance with a tax professional. Self2Solar can help provide product documentation, but this page is not tax advice.

Need the exact backup kit for your home?

Send a recent utility bill, main-panel photo, and the loads you want backed up. Self2Solar will recommend a kit, wiring approach, and parts list for review.

Get a free system design