Can a 10kWh home battery back up a whole house at every load? No, and the published page shows where the ceiling sits.
The page for the HZEB-LCT-10 makes two runtime statements that look contradictory until the load behind each one is written down. It also publishes the number that decides whole-house eligibility, and that number is not the 10 kWh. It is the 100 A discharge limit.
A whole-house claim is a power question first and an energy question second. Energy decides how long the house runs. Power decides what can run at the same time.
The number that decides whole-house claims
The published specification states a maximum discharge current of 100 A at a nominal 51.2 V. Multiplied out, that is an arithmetic ceiling of about 5.12 kW of continuous output from the battery alone. The same arithmetic on the wider range gives about 7.68 kW for the 16 kWh unit at 150 A and about 10.24 kW for the 20 kWh unit at 200 A.
That ceiling is the whole-house question. A modest home whose simultaneous draw stays under roughly 5 kW is genuinely covered. A home that expects an oven, a water heater and an air conditioner to run together is not, and no amount of additional energy fixes it, because the limit is current rather than capacity.
Two published runtime claims, two load bases
The page states that 10 kWh powers an average home for 8-12 hours during outages covering all essential appliances, and answers a separate question by saying that for an average household consuming 8-10 kWh per day, 10 kWh can power essential circuits for 12-24 hours, or full home usage for 8-12 hours depending on load.
Both statements can be true, because the two are not compared on the same basis. Divide the energy by the hours to recover the load each one assumes.
Worked example. Essential circuits for 24 hours implies an average draw of about 0.42 kW, and for 12 hours about 0.83 kW. Full home usage for 12 hours implies about 0.83 kW, and for 8 hours about 1.25 kW. Meanwhile a household consuming 8-10 kWh per day averages 0.33 to 0.42 kW around the clock. So the full-home figure is consistent only when the coincident draw stays near 0.83 to 1.25 kW, which is a lightly loaded house, not one running heavy appliances. The arithmetic is on the published capacity and the published runtime statements, and the loads implied are not published.
That is why a load-based proposal starts with the load ledger rather than the battery. The shows the ledger format, including the running and starting figures per appliance, and the shows how usable AC energy rather than nameplate capacity converts into hours.
What the SKU includes
Voltages, currents, dimensions and weights are quoted from the published product specifications, verified as of 2026-09. The continuous output column is arithmetic on the published voltage and current, not a tested figure.
What the unit carries on its own is storage, cell management, a published cycle life of 6000 or more, published efficiency of at least 95 percent, an indoor protection rating and a ten-year warranty. What it does not carry is anything that converts, transfers or distributes that energy inside a house.
What is missing from a whole-house package
Four items are almost always outside the battery line. An inverter or hybrid unit with enough continuous and surge output to serve the coincident peak. A transfer means that is approved for the installation, whether that is an integrated gateway or an external changeover device. An essential-load panel, or the decision to serve the main panel and accept the consequences. And a metering point, where export, tariff control or a subsidy scheme depends on it.
Two more are physical. At about 95 kg the unit needs a wall assessment and a mounting decision before the order, and the published protection rating keeps it indoors. The apply unchanged.
The last is the gap between nameplate and usable capacity. A 10 kWh pack does not deliver 10 kWh of AC energy, because depth of discharge, reserve settings and conversion losses all take a share. When a quotation states a runtime, ask which of those three was included. The covers the same boundary from the purchasing side.
The approved package, and what to write down
Build the proposal in this order. List the circuits to be backed up with running power and starting power for each. Add the coincident peak, not the sum of everything on the property. Check that peak against the published discharge limit of the chosen unit, and if it fails, move up the range or shed the load. Only then divide the usable energy by the average running load to get the hours.
Two requests belong in writing before the order. Ask the supplier for the continuous discharge rating at the intended operating temperature, and for how long the unit can exceed it, because a short surge capability and a continuous rating are different figures. Ask for the usable energy under the proposed reserve setting rather than the nameplate figure.
Two items are effectively irreversible once the job starts. The partition of the distribution board decides which circuits survive an outage for the life of the installation, and the mounting positions are fixed when the wall is opened. Both are cheap to change in the proposal and expensive to change afterwards.
At handover, record the load ledger, the reserve setting, the coincident peak the design was checked against and the commissioning figures. If the homeowner later adds a large appliance, that record is what shows whether the system was undersized or simply asked to do something new.
The carries the rest of this cluster, alongside the for the published figures themselves and the for the next step up when the load ledger outgrows the current limit.
FAQs
1. Can the HZEB-LCT-10 back up a whole house?
It can back up a whole house whose coincident draw stays under its published discharge limit. The specification states a maximum discharge current of 100 A at a nominal 51.2 V, which is an arithmetic ceiling of about 5.12 kW. A home running an oven, a water heater and an air conditioner together exceeds that ceiling regardless of stored energy.
2. Why do the published runtime figures differ so much?
Because they assume different loads. Essential circuits for 12 to 24 hours implies an average draw of roughly 0.42 to 0.83 kW. Full home usage for 8 to 12 hours implies about 0.83 to 1.25 kW. Both can be true; they are not compared on the same basis, and the load behind each one is what has to be checked.
3. How much backup time does 10 kWh give?
Divide usable AC energy by the average backup load. A 10 kWh battery does not supply 10 kWh of AC energy, because depth of discharge, reserve settings and conversion losses each take a share. Use the usable figure under the proposed reserve setting, not the nameplate capacity.
4. What else does a whole-house package need besides the battery?
An inverter or hybrid unit with sufficient continuous and surge output, an approved transfer means, an essential-load panel or a decision to serve the main panel, and a metering point where tariff or export control applies. The battery line alone converts nothing and transfers nothing.
5. What should I ask before approving the package?
Ask the supplier for the continuous discharge rating at the intended operating temperature and for how long the unit can exceed it, since surge capability and continuous rating are different figures. Ask for the usable energy under the proposed reserve setting. Then record the load ledger, the reserve setting and the coincident peak the design was checked against.
