Method
Sources and assumptions you can inspect.
Runtime calculation
Each tool uses its stated or entered battery capacity, conversion allowance, unused reserve and device demand. A range may use low and high device loads. This is a planning calculation, not a laboratory measurement.
Cold and battery condition
Calculations use the capacity and loss or reserve factors shown by that tool. Cold and battery ageing are not separately modelled. Those margins do not measure your battery’s condition or guarantee that every practical loss is covered.
Charge level is not battery health
Cold can temporarily limit available energy and output; ageing can reduce storage capacity. A battery originally rated at 1,000 Wh with 80% remaining capacity can store about 800 Wh before conversion losses, even while its display says 100% charged. That 80% health figure is different from an 80% usable-energy assumption.
No fixed loss from age or temperature
The effect depends on the battery, use and conditions. We do not infer a fixed loss percentage from age or outdoor temperature alone. Follow the separate charging and operating temperature limits in the exact manual, and check important applications with your actual setup.
Technical compatibility
Normal demand, brief starting load, panel voltage and current, the complete cable route and the regional electrical version are separate checks. A plug that fits does not make an unsafe electrical combination suitable.
Sources and evidence
Manufacturer specifications, calculated estimates, user measurements and our own physical tests remain different evidence types. A profile based on manufacturer data is not an independent hands-on review.
Philippine versions
The same model name can have different voltage, frequency, sockets, cables or output in different countries. We state the source region; an overseas document or image does not prove the Philippine specification.
Corrections and independence
Send the page URL, regional version and supporting source through Contact. Verified corrections go into the shared record used by calculators, comparisons and profiles. Retailer payments do not change inputs, warnings or the order of technically suitable models. Paid placements must be labelled and kept separate from technical ranking.
Further sources
Apple: lithium-ion battery ageing · BLUETTI AC60P manual: temperature and use
One model’s temperature limits do not automatically apply to another model.