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Backup Power Packages

These systems provide emergency backup power for your household and are recharged either with your existing solar panels, the power grid, or with a gas generator. Batteries sold separately, see system details for options.

Outback Power

ModelPart No.DescriptionPrice
2550158Outback Inverter Radian Bundle GS4048A-AC 4000W 120/240VAC Inverter - UL1741-SA Listed
$7,000.00
Qty
2550159Outback Inverter Radian Bundle GS8048A-AC 8000W 120/240VAC Inverter - UL1741-SA Listed
$9,760.00
Qty
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Midnite Solar

ModelPart No.Output WattsBattery Bank VoltagePrice
MidNite Solar MNSI6048D Dual Sunny Island AC Coupled Power Center294548512000W48VDC
$13,375.00
Qty
Item is not returnable.
MidNite Solar MNSI6048-QUAD SMA Sunny Island Power Center294550024000W48VDC
$25,525.00
Qty
Item is not returnable.
MidNite Solar MNSI6048 Sunny Island AC Coupled Power Center29454756000W48VDC
$8,200.00
Qty
Item is not returnable.
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DC Coupled Backup Power Kits

ModelPart No.DescriptionPrice
DC Coupled Backup Power Kit with 2kW Inverter
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1893445WSS DC Coupled Backup Power Kit with 2kW Inverter
$4,896.00
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DC Coupled Backup Power Kit with 4kW Inverter
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1893449WSS DC Coupled Backup Power Kit with 4kW Inverter
$5,557.00
See Details
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Backup Power Info

This page features stand-alone backup power packages (without solar included) that can be added to an existing PV system. If you are interested in solar + battery backup, browse our grid-tied system packages with energy storage included.

Adding storage to your system makes it more versatile. There are two core benefits:

  • Provide backup power during grid outages
  • Store energy locally so you can control how it feeds into the grid

In a standard grid-tied system, the energy generated by your solar panels feeds into the grid. The utility company credits you for the power you generate, and you can use those credits at any time to withdraw from the grid and power your appliances.

However, this connection to the grid means you are still at the mercy of power outages. To keep the lights on during an outage, you need on-site energy storage to take over the power supply when the grid goes down.

In addition to backup power, these systems help you make the most of your utility’s net metering policy - for example, deferring usage to offset high time-of-use rates, or facilitating energy resale if local policy allows it.

Add Batteries to Your Existing Grid-Tied System

Most grid-tie inverters are not designed to integrate with a battery bank. To retrofit your current system with energy storage, you’ll need to add new components to make your inverter work with your batteries.

The systems on this page are designed to retrofit an existing grid-tie solar system with energy storage via AC coupling.

In an AC coupled system, the grid-tied inverter is paired to an off-grid inverter and battery bank. The off-grid inverter provides a second power source, which allows you to charge your batteries and run essential appliances during a power outage.

The best option for AC coupling is the Outback Radian. The newest firmware supports frequency shift AC coupling, which causes the off-grid inverter to shift its frequency to control the output of the grid-tied inverter when necessary.

Add a Generator for Backup Power

Generator Packages

ModelPart No.DescriptionPrice
14kW Kohler Partial Home Backup Generator Package1894050WSS 14kW Partial Home Backup Kohler Generator Package
$4,736.40
Qty
20kW Kohler Full-Home Backup Generator Package1894100WSS 20kW Full Home Backup Kohler Generator Package
$5,580.80
Qty
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Gas generators are the most cost-effective backup power solution. If you simply need a way to keep the lights on during an outage, a generator is probably your best bet.

Generators have some key drawbacks compared to battery backup systems:

  • Cannot manage time-of-use offset, energy resale, or other opportunities to take advantage of your net metering policy
  • Does not provide uninterrupted backup - generators take a few minutes to switch on and power up
  • Need to be re-fueled
  • Noisy while operating

There are some advantages to using generators for backup power as well:

  • Generators have the lowest up-front cost
  • Generators are typically sized to back up your whole house (batteries are usually sized to only power essential appliances since they cost a lot more)

We have noticed a surge of interest in backup power from Californians who are concerned about mandatory blackouts imposed by PG&E. Those scheduled blackouts have left Californians searching for a way to supply uninterrupted power to their homes during outages.

For these customers, we are recommending generators as the preferred solution. A generator will provide more backup power at a lower cost, and you won’t need to rewire your existing solar system (if you have one) to add a generator into the mix. The concerns about refueling are limited if the generator is fueled by an on-site propane tank. It’s a relatively low-cost way to provide robust backup power for most or all of your household.