NO. 06APOLLOGRID-SCALE LAUNCHSOC0%
Store the sun. Spend it after dark.
Solstice is a 20 kWh grid-scale battery that charges from your array through the day and discharges into your home — or back to the grid — exactly when a kilowatt-hour is worth the most. The field above is its live state-of-charge: it fills as you read.
$99 holds your Q1 install slot · cancel any time before dispatch
NO. 01RESERVATIONSLive
1,842units reserved toward the Q1 build
Cleared by the operators who run the grid
NO. 02 / ONE SOLAR DAY / STATE-OF-CHARGE
How the day moves through the pack.
Sun up to sun down, one cell at a time. Three moments tell the whole arbitrage — fill at dawn, hold through the glut, discharge into the peak. Each card warms toward lime as the page charges beneath it.
Charge at first light
From dawn your array fills the pack. Solstice tracks the sun and meters every watt into the cells, so the morning surplus becomes the evening's reserve instead of being sold back at a loss.
- In-rate
- 8.4 kW
- ΔSOC
- +62%
- Grid price
- $0.09
Hold through the peak
At midday, when the grid is cheapest and your roof is loudest, the pack sits full and patient. Solstice holds state-of-charge to the percent and waits for the price to turn.
- Reserve
- 20.0 kWh
- Drift
- ±0.2%
- Grid price
- $0.06
Discharge when it counts
As demand spikes after sundown, the reserve discharges into your home or back to the grid at the day's highest rate — silent, seamless, and measured to the last kilowatt-hour.
- Out-rate
- 11.5 kW
- ΔSOC
- −48%
- Grid price
- $0.41
NO. 03 / WHY STORE IT / THE SPREAD
A kilowatt-hour isn’t worth the same all day.
Wholesale power collapses under the midday solar glut and triples after sundown. Solstice buys the trough and sells the peak — the same 20 kWh, paid for at different prices. Drag across the day to read the spread.
- 06:00Charge cheapFill the pack while wholesale prices bottom out under the midday solar glut.
- 13:00Hold fullSit at 100% through the cheapest hours and wait for the evening to turn.
- 19:00Sell dearDischarge into the after-dark peak when each kilowatt-hour is worth the most.
Buy the trough, sell the peak — the same 20 kWh earns its keep twice over. Across a year that arbitrage runs back into your account:
$640–$900/ year, hands-off
Estimated on a 2,400 kWh annual cycle at a 16 ¢ average peak-to-trough spread · your tariff may pay more.
NO. 04 / SPEC SHEET / NOTHING WITHHELD
Every number you need before you put down a deposit.
No fine print on a separate page, no asterisk that changes the deal at checkout. Capacity, output, efficiency, warranty and the refund window — the entire reservation on the table before $99 leaves your account.
- Usable capacity
- 20kWhStackable to 80 kWh per cabinet.
- Continuous output
- 11.5kW30 kW peak for motor-start surge.
- Round-trip efficiency
- 96%LFP cells, liquid-cooled.
- Warranty
- 12yr / 70%Guaranteed retained capacity.
- Ships
- Q1 reserveReservation locks your install slot.
- Returns
- Fully refundableCancel any time before dispatch.
NO. 05 / RESERVE · FULLY CHARGED
$99 today. The rest when it ships.
Your deposit is fully refundable and locks a Q1 install slot at the launch price. Cancel any time before dispatch and we return it in full — no questions, no restocking fee.
- $99 holds your slot
- Launch price locked
- Refundable to dispatch
Fully refundable · no card stored until ship