Panasonic Solving Home Battery Storage Datasheet

Panasonic Solving Home Battery Storage

Getting Started

solar plus battery storage technology is now a readily accessible and affordable option for many homeowners. The tricky part is designing a system that puts the solar array’s output and the battery’s capacity to best use. The pairing must provide consistent, reliable power when a homeowner needs and/or wants it — which could be two different things. In this report, we will assess three customers with different home profiles who all have differ-ent expectations for how their system will per-form, and match the best solar + battery system for their needs.

Key questions
Right off the bat, customers need to answer these questions:

• Do you want to use the battery at night and when the sun isn’t shining to reduce your reliance on the grid?
• Do you want to save the most you can on energy bills?
• Do you just want the battery there in case the grid goes down?

Answering those questions is a good start, but the optimal system design still depends on how much energy the home uses, where it is located and which devices are deemed a priority in an outage

Sizing battery backup systems
Obviously, every home needs to be assessed case by case, but just as an example, we’ll use the average home energy usage of 303 kWh a month to demonstrate the backup storage capacity of a Panasonic EverVolt battery system:

• Daily average usage 303 kWh/31days = 10kWh
• 10kWh * 70% essential load correction = 7kWh
• Backup duration using EV Plus 17.1 kWh 17.1 kWh / 7 kWh * 24 hrs = 56hrs
• 56 hours * 80% design buffer = 45hrs of backup for essential loads

 | Critical Appliances (Emergency Back up)|

Back up More Appliances

|

Back up Most/All Appliances

---|---|---|---
Description| 1 x EverVolt System| 2 x EverVolt Systems| 3 x EverVolt Systems
Output Power to Loads| 5.5 kW| 11 kW| 16.5 kW
Continuous Current (off-grid)| 23A| 46A| 69A
Surge Current (w/grid)| 29A| 58A| 87A
Energy Storage Capacity| 17.1 kWh| 34.2 kWh| 51.3 kWh
Max PV Input| 6.5 kW| 13 kW| 19.5 kW

Backed Up Loads

|

4 – 6 x 20A circuit breakers. Ex. Lighting / internet / TV / refrigerator / garage doors / coffee / cell phone / tablet

| Most 20A circuits and some 240V appliances. Ex. Larger AC / HVAC / water pumps, washer-dryer, multiple AC units|

Larger AC / HVAC / water pumps / washer-dryer /

multiple AC units

The system we’re using
For each example, we will be sizing Panasonic’s EverVolt system, which consists of solar PV panels, batteries, a battery enclosure and an inverter. It is available in AC- and DC-coupled versions, both of which can be sized from 11 kWh to 102 kWh to provide continuous backup power. EverVolt can be customized between multiple operating modes, such as Time of Use, and provides visibility into system status. It is backed by a 10-year warranty.

• Capacity : 11 kWh to 102 kWh
• Battery Voltage : 46.2V
• Energy : 11.4 kWh useable Standard, 17.1 kWh usable Plus
• Output Power : 5.5kW off-grid, 7.0kW grid-tied
• Dimensions : 29” x 47” x 18”

Scenario 1:

The Solar Investor

Customer is seeking:
ROI. The customer wants to store the excess solar power produced by their system during the day for maximum savings and send it back to the grid for credits

Key questions to ask

• How much of your daily energy consumption do you want to offset with the PV system?
• How much battery capacity does the homeowner need and what type of loads does the homeowner want to back up?
• What’s the local utility net-metering policy and what are some charges that the customer might incur on the utility bill?

Home profile

• Location : New Jersey
• Size : 2,400 sq ft
• Usage : 914 kWh/month on average. Average household spend on electricity in New Jersey is $3,065 per year, third highest in the country.
• Load profile : Space heating accounts for 49% of household energy consumption, followed by appliances, electronics, and lighting (31%), and water heating (18%). Air conditioning accounts for 3% of the total household energy use.

Solution

6.5-kW solar PV + 17.1 kWh battery

Assessment

Solar:
To offset nearly 80% to 90% of the energy consumption of an average home in New Jersey, a 6.5-kW PV system is required, comprising of about 16 to 18 panels and a solar PV inverter.

Rate:
Net metering enables customers to receive full retail credit on their utility bill for each kWh of electricity their system produces over the course of a year. At the end of an annualized period, the customer will receive credit on their utility bill at the wholesale value of electricity for any excess generation that remains.

Storage:
A single battery and the EverVolt AC-Coupled energy storage system can deliver 5.5 kW AC output to power the essential loads.

System settings:
To send excess power back to the grid for net-metering applications, the system can be set to “Time-of-Use” mode with battery feed-in to the grid. In order to maximize solar energy savings, the EverVolt battery system can be set to “Residential” mode to power up the essential loads when the sun goes down. During both of these operating modes, the battery reserve levels can be set to stay prepared in case of an unexpected outage.

Panasonic Advantage
Panasonic’s EverVolt 370-Watt solar panels have the industry’s best temperature coefficient (-0.26%/C), which allows efficient module performance in varying temperatures. EverVolt panels are also warrantied to perform at 92% efficiency in year 25, while the industry average is 86%.

Scenario 2:

The Whole-Home Dreamer

Customer is seeking:
Back up power for all appliances with the battery and to eliminate grid power usage.

Key question:
How much battery capacity does the homeowner need and what type of loads does the homeowner want to power from the batteries?

Reminder

• The average U.S. household consumes ~ 30 kWh per day.
• 1 x EverVolt Plus is 17 kWh usable energy
• 17 kWh / 30 kWh = 0.6 * 24 hrs = 14 hrs of backup
• More realistically after accounting for various mitigating factors: 14 hrs * 70% = 9 hrs of backup

Home profile

• Location : Georgia
• Size : 1,960 sq ft
• Usage : 1,100 kWh/month on average
• Load profile : With Georgia’s warm and humid climate, air conditioning is widely used, and the residential sector’s per capita energy consumption is above the national average, although it is also less than in almost three-fifths of the states. Overall, Georgia ranks among the top 10 states in the nation in total energy consumption, but per capita energy consumption is less than in nearly two-thirds of the states

Solution

15-kW solar PV + 51.3 kWh

Assessment

Rate:
Georgia Power has an “avoided energy” rate and a Solar Buy Back program. All unused energy produced by the solar panels results in bill credits that carry over into the next month. These credits can go toward your bill or be sold back at the avoided energy rate. With Georgia Power’s program, the best way to maximize your solar savings is to ensure that you use as much of your solar electricity at home when it’s produced so that you send as little back to the grid as possible.

Solar:
To offset nearly 100% of the energy consumption of an average home in Georgia, approximately a 15-kW PV system feeding each EverVolt systems is required comprising of about 13 panels and with solar PV string inverter / microinverter.

Storage:
The 15-kW PV system can be tied to 3 x EverVolt AC-coupled systems with 17.1 kWh battery capacity each for backing up larger loads like washer / dryer, air conditioner, etc., in addition to essential loads.

Panasonic Advantage
In addition to the triple-stacked AC EverVolt system, a generator can be integrated to offer additional backup power in case the battery runs out and provide an additional level of resiliency. That is unique among solar + storage system options.

Scenario 3:

The Power Player

Customer is seeking:
Backup. The customer wants to back up as many appliances with the battery and minimize their utility bills.

Key question:
How much battery capacity does the homeowner need and what type of loads does the homeowner want to power from the batteries?

Home profile

• Location : California
• Rate territory : California’s electricity prices are among the highest in the country. One reason is that California’s size and geography inflate the “fixed” costs of operating its electric system, which include maintenance, generation, transmission, and distribution as well as public programs like CARE and wildfire mitigation.
• Size : 3,400 sq ft
• Usage : 1,100 kWh/month on average*
• Load profile : Since California has a milder climate than other areas of the United States, space heating and air conditioning make up a relatively small portion of energy use. In California homes, heating and cooling combined account for 31% of total energy use.

12-kW solar PV + triple-stacked EverVolt systems

Assessment

Solar:
To off-set nearly 100% of the energy consumption of a large home in California, a 9 to 12 kW PV system is required comprising of about 35 panels and with solar PV string inverter / microinverter.

Storage:
With 17.1 kWh battery capacity, one EverVolt ESS can backup essential loads like lights, refrigerator, garage door and other small household appliances. Since the homeowner wants to back up a lot of devices and high current appliances, the EverVolt systems can be stacked (up to 3 systems) to provide more output power — approximately 15-16 kW.

Outtage scenario:
Two EverVolt systems can back up basic loads plus

Panasonic Advantage
Panasonic’s entire system is covered by the Panasonic AllGuard Warranty. When installed by a Panasonic Authorized, Premium or Elite installer and registered through the Panasonic website, homeowners will have the following EverVolt warranty options

• The Panasonic TripleGuard Warranty covers EverVolt panels for performance, product, parts and labor for 25 years.
• The Panasonic AllGuard Warranty covers labor to replace and repair all major components in an EverVolt system. Applicable to Panasonic AC modules, this warranty covers solar modules combined with microinverters sold by Panasonic, approved racking for 25 years and the monitoring hardware for five years.
• The battery storage product is backed by a 10-year product and performance warranty

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