Advanced battery
energy storage system
Fossil Fuel Generator
4-8 kW
7-10 kW
6-10 kWhr
Depends on tank size
Forever,
if solar is available
Til the fuel runs out
Probably not, unless
consumption is very low
Yes
Backup critical loads forever
Yes
No, limited by fuel tank
Time to power up in outage
Instantaneous
30-40 seconds
(enough for devices to lose power)
Noise
Silent
70-80 dB
(loud as a city street)
Service required
None
Annual service:
oil change and filters
10 year
0-2 years
Yes, included in cost
No
Future smart home ready
Yes
No
Future smart grid ready
Yes
No
Provides protection against
solar regulatory changes
Yes¹
No
Requires weekly ‘exercise’
to be available
No
Yes
$12,000²
$7,000
N/A
$500
Annual service cost (est)
None
$200
Annual fuel cost (est)
None
$300³
Expected system life
15 years
12 years
Total cost over system life
$12,000
$13,000
ReVisionEnergy.com
Maximum peak power (kW)
Energy Storage
Duration
Backup the whole house
Warranty
Internet enabled
Net Installed Cost
Plus gas install
Footnotes:
¹ Installing energy storage provides some mitigation of risk associated with future Net Metering uncertainty and other rate
design risk by allowing a customer to maximize self consumption, minimize demand charges or optimize energy use
patterns for a possible Time of Use rate.
² Net Cost: Assumes storage is charged by a solar energy system and so is eligible for the 30% federal tax credit
³ Assumes 100 G a year at $3/G propane