Keeplight K13
13.5 kWh behind one white shell. Scroll to take it apart.
4.8from 1,787 owner reviewsMove the pointer to turn it.Drag sideways to turn it.
Charge light
Amber rises from the bottom as the battery fills. Forty segments, 2.5% of the pack each.
62% · 8.4 kWh42 hours of the sample house
Inside
Lithium iron phosphate cells wired as one 51.2 V pack. The inverter under them feeds the house panel.
On the wall
29.5 in wide and 5.9 in deep, fed by one conduit from the panel. Rated NEMA 3R, so an outside wall works too.
The numbers
Figures are the sample house’s. Yours will differ.
One outage, hour by hour
An ice storm, one house, one K13 and a 6 kW roof. Every figure is the sum of what the house had switched on.
Hour 0 · 6 pm, day 1
Freezing rain takes the lines down at 6 pm. One house keeps its windows: the battery took it over by itself, with a full 13.50 kWh, and nothing inside needed a restart.
Hour 4 · 10 pm, day 1
At 10 pm the mask goes on and the house draws 270 W. The CPAP will take 0.32 kWh by morning. The battery holds 12.58 kWh.
Hour 12 · 6 am, day 2
Twelve hours in, the night has used 2.72 kWh. The fridge is cold, the router never dropped, and 10.78 kWh is left.
Hour 41 · 11 am, day 3
The sky clears on the third day. A 6 kW roof makes 21.6 kWh on a clear day, more than the battery holds, and by 11 am it is full again: 13.50 kWh.
The grid comes back at 7 am on day 4, 61 hours after it left. The battery never fell below 7.91 kWh.
Read the whole outageWhat it runs
Choose the appliances and the hours a day each one runs. The sum is yours: how long one, two or three K13 keep that list going, with and without a roof.
Typical average draw of each kind of appliance, not a measurement of yours. The label on the back of the appliance has its own figure.
This list runs for
68hours
2 days and 20 hours on one charge, with no sun.
No solar: the battery carries the list on what it holds.
Price this setupOwner reviews
4.8
1,787 owner reviews
“Six days. My oxygen machine stayed on the whole time, and the light on the front told me each morning what I had left.”
Dorothy A.Asheville, North Carolina
“A short one. The kids did not notice until they saw the neighbors on their porches with flashlights.”
Kevin D.Tampa, Florida
“Four days without the grid. The roof refilled it every afternoon and we never ran the generator once.”
Nadia P.Lake Charles, Louisiana
Installation
Two installers, one conduit to your panel and a backup switch by the meter. The power is off for about two hours.
45 minutes · One installer
Two to four weeks · We file it
Six to eight hours · Two installers
30 minutes · Your city, with us there
15 minutes · You and the installer
Price and order
One K13, its backup switch and the installation. Set yours below; the next step books a free site visit, and no card is asked for.
Warranty
10years
70%of its capacity, or we fix it
If the K13 holds less than 70% of its 13.5 kWh within 10 years of the day it was switched on, we repair or replace it. Parts, labor and the trip are covered.
Warranty in fullAdd up the watts of what you want on, times the hours a day each one runs, and divide 13.5 kWh by that. The sample house on this site uses 4.76 kWh a day, so a full charge lasts about 68 hours with no sun. The calculator does the sum for your own list.
No. The backup switch takes the house off the grid and the battery takes over by itself. What helps is deciding beforehand what stays on.
It keeps a CPAP or an oxygen concentrator running like any other load, and the calculator shows how long each one lasts. Ask your doctor and the device maker how long it must run, and keep a plan for when the charge gets low.
No, but it recharges from them. Without panels it carries the house on its stored 13.5 kWh. With them, a clear day can fill it again: a 6 kW roof with 4.5 sun hours makes about 21.6 kWh after losses.
On a garage wall, a utility room wall or an outside wall: the case is rated NEMA 3R. It needs 29.5 in of wall and 5.9 in of depth. If the wall cannot carry 282 lb, it stands on the floor on steel feet.
One K13 is $7,900. A home also needs one backup switch ($1,150) and installation ($2,600 for the first unit). That is $11,650 for one unit on the wall, before sales tax. The installer confirms the price at the site visit.
If the K13 holds less than 70% of its 13.5 kWh within 10 years of the day it was switched on, we repair or replace it. Parts, labor and the trip are covered.
The fridge, the lights, the router and the machine by the bed, for as long as the sum says.
