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Charging hard when the cells are cold can plate lithium on the electrode surface, which permanently reduces capacity and safety margin. The battery management system therefore caps charge power, often while an internal heater warms the stack, then opens up once the cells are in their proper window. That is protective behaviour, not a sign that the installation has failed overnight." } }, { "@type": "Question", "name": "Where does the solar go while the battery is still warming?", "acceptedAnswer": { "@type": "Answer", "text": "Solar does not wait outside a cold battery. It serves the house first, which on a frosty morning often includes heating controls, hot water, kettles and, if you have one, a heat pump working harder than on a mild day. Any surplus beyond household demand is exported to the grid under whatever export arrangement you already have. The energy is redirected for a short time, not lost; on a short winter day the battery usually still has the afternoon to fill." } }, { "@type": "Question", "name": "Is the energy used to warm the cells wasted?", "acceptedAnswer": { "@type": "Answer", "text": "It is spent, not wasted. Warming draws a small amount of power for a short period so the battery can then accept charge at its normal rate and avoid cumulative cold-charge damage. Manufacturers differ on whether that heat comes from stored energy, solar or the grid, so check your own manual. Measured against years of quieter capacity loss, the wait is usually a good trade." } }, { "@type": "Question", "name": "Why can the app show strong solar generation and almost no battery charge at the same time?", "acceptedAnswer": { "@type": "Answer", "text": "Those are two different measurements. Generation is what the array is producing; charge power is what the battery is willing to accept. Cold cells can refuse most of that power even while the inverter is producing normally. Panels also tend to work more efficiently in cold, bright weather than in heat, so a crisp morning can look strong on the roof and cautious in the cabinet at the same time." } }, { "@type": "Question", "name": "How can I tell normal cold-weather behaviour from a fault?", "acceptedAnswer": { "@type": "Answer", "text": "Normal frost-morning behaviour usually starts with low charge power that climbs as the space warms, full accepted current later in the morning, and ordinary behaviour for the rest of the day. The system may show a low temperature, charge limit or heating state rather than an error, and discharge to the house often continues more readily than charging. Ask your installer if charge power stays capped on mild days, a fault code persists, the location routinely falls outside the product’s specified range, or the behaviour does not match your manufacturer’s documentation." } }, { "@type": "Question", "name": "Does slow charging on a cold morning mean the battery is the wrong size?", "acceptedAnswer": { "@type": "Answer", "text": "No. Cold-morning current limiting is a temperature behaviour, not a capacity one. Whether a battery is the right size is judged across a full year of household use and generation, not on one frosted hour. Two systems with the same kilowatt-hour rating can also behave differently if they sit in different cupboards." } }, { "@type": "Question", "name": "Should I change overnight charging in winter, or put a heater near the battery?", "acceptedAnswer": { "@type": "Answer", "text": "Do not treat either as a DIY fix. 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Ask whether the unit has active cell heating, how charging is scheduled against your tariff, and whether ventilation and clearances match the manual. 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