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If a home battery will not charge or supply backup power, first identify whether the problem is missing app data, a low battery, or a battery that has stopped delivering power. Record the exact alert, state of charge, utility-power status, and whether solar is producing. Check only the status indicators and owner instructions for your exact system; do not open the battery or inverter. App labels, controls, and restart procedures vary by model.
Start by identifying what has stopped working
“Not working” can describe several different problems. A blank app display does not by itself show that the battery has failed: Tesla notes that missing power-flow data can result from an offline gateway or meter. A battery that is not gaining charge and a charged battery that is not powering the home call for different checks.
- App data is missing: Note whether the app says the system or gateway is offline, and whether the home otherwise has utility power.
- The battery is not charging: Record its displayed state of charge, any alert, and whether solar production is visible.
- The battery is not powering the home: Check whether utility power is available, whether the home is in an outage or backup mode, and whether the app reports low charge or an output-related alert.
- Both charging and backup have stopped: Record when the problem began and any recent outage, weather event, or change in system status.
Keep the exact wording of alerts rather than translating them into a presumed diagnosis. Tesla labels such as “Breaker Open,” “Powerwall Overloaded,” “Waiting for Solar,” “Calibration in Progress,” and “Side Switch Off” apply to that manufacturer’s system; other brands may use different labels or meanings. See Tesla’s Powerwall troubleshooting guidance.
Check the operating conditions and alert
Before taking action, establish whether the home has utility power and whether the battery is in normal operation or backup mode. Note whether solar is producing, but do not assume that solar is available just because panels are installed. Tesla advises against using its general troubleshooting process during a grid outage or extreme weather; follow the instructions for your installed model and operating situation instead.
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Some alerts describe a temporary system state rather than a failed battery. For example, Tesla says Powerwall calibration can last up to 24 hours, during which the battery may not charge from solar. Tesla’s “Waiting for Solar” alert indicates that the system is waiting for solar conditions. Those details and labels are specific to Powerwall, not a general rule for other home batteries. Tesla’s alert explanations are at Powerwall alerts and troubleshooting.
If backup stopped, check for low charge or heavy loads
After a long outage or substantial backup use, the stored energy may be too low to keep supplying the home. Tesla says a Powerwall below 10% can enter standby. When paired with solar, it may try to recharge during daylight; if there is not enough energy to restart, it may wait for a grid connection. This threshold and behavior are specific to Powerwall.
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If the system reports overload, reduce high-power loads where it is safe and practical to do so. Tesla says an overloaded Powerwall may retry after loads are reduced. During an outage, reducing large loads can also help preserve the available backup energy. Do not use another brand’s thresholds, alert meanings, or restart steps as a substitute for its own instructions. See Tesla’s Powerwall alert guidance.
Observe status indicators; do not open the equipment
Read the app and, if it is safe to do so, note any visible indicator lights from outside the equipment. Use the owner manual for the exact model to interpret them and to identify controls the manufacturer explicitly permits owners to use. A breaker alert, an unexpected off status, or an inverter fault is a reason to consult that model’s support instructions, not to investigate wiring yourself.
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Do not remove a battery cover, open an inverter or gateway, or open an electrical panel to test connections. Tesla describes Powerwall and Gateway as not user-serviceable and warns that opening the Gateway deadfront can expose wiring and create an electric-shock hazard. Its Powerwall 3 manual also identifies the Gateway and Backup Switch as non-user-serviceable. Other systems have their own service boundaries; Generac’s PWRcell manual, for example, gives product-specific instructions that should not be applied to a different system. Consult the manual for the installed model: Tesla Powerwall manuals and Generac product support.
Do not try a generic power-cycle sequence. Shutdown and restart steps can depend on the battery, inverter, gateway, and connected solar equipment; Tesla manuals specify sequences for its systems and caution that interconnected solar may need to be turned off before certain Powerwall shutdown steps. Use the exact model’s manual or contact its support team for any restart procedure.
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Stop immediately if the equipment may be dangerous
Do not continue troubleshooting if there is smoke, a burning smell, unusual heat, visible damage, flooding, or another immediate hazard. Move affected people away and contact the fire department or relevant emergency response team if health or safety is threatened. If battery equipment, a gateway, or wiring is submerged, stay out of the water. Follow emergency directions from the manufacturer and local responders. Tesla’s emergency guidance is at Tesla Powerwall troubleshooting and Powerwall Emergency Response Guide.
When to contact the manufacturer or installer
Contact the system maker or an installer qualified for the installed equipment if an alert persists, the system is unresponsive, charge remains unexpectedly low, backup repeatedly stops, or the symptoms suggest a breaker or wiring problem. Any repair that requires opening equipment belongs with qualified service personnel—not an owner-level check.
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When you call, have these details ready:
- Battery and inverter make and model, if known
- The exact alert text and any visible indicator-light state
- The displayed state of charge and when you observed it
- Whether utility power is available and whether the system is in an outage or backup mode
- Whether solar production is visible
- When the problem began and whether it followed an outage or other event
Manufacturer procedures are system-specific. For another example of product-specific support, consult Generac’s PWRcell product support; do not use its procedures for a different brand.
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