Usable energy
Nominal capacity is reduced by allowed depth of discharge, conversion losses and reserves.
ANTAEngineering & Infrastructure
Understand what a battery can really back up, for how long and under which conditions.
This resource explains the principle, key decisions, common mistakes and the data required to go further.
A/01
Design principle
Data • Interfaces • Evidence
Solar
Key points to retain.
A battery is not selected only by its headline capacity. Define backed-up loads, duration, power, cycles, temperature, recharge strategy and end of life.
- Autonomy relates usable energy to load energy in a defined scenario.
- A “full” battery may reserve margins that are not available to normal loads.
- Temperature and depth of discharge strongly influence life.
A/01Principle diagram — project-specific adaptation required
Guided reading
Understand the mechanism, then its consequences.
Power
Peaks, motor starts and maximum current may limit operation before energy is depleted.
Cycle and ageing
Charge-discharge cycles, calendar time and temperature all contribute to ageing.
Backup strategy
Priorities, shedding, thresholds, grid or generator recharge and return to normal must be programmed and tested.
Prepare a study
Useful data before reaching a conclusion.
The visitor can begin with these items. ANTA will then determine which measurements and checks are really required.
- List critical loads
- Set target outage duration
- Record starting power
- Define thermal conditions
- Plan BMS, safety, access and replacement
Frequently asked questions
Clear answers without oversimplifying.
01How many hours will it last?
It depends on usable energy, power and load profile, losses and protection thresholds.
02Can it run air conditioning?
Sometimes, but both power and energy may be high. Compare the requested service against other priorities.
03What does LFP mean?
Lithium iron phosphate, a battery chemistry with specific safety, power and cycling characteristics.
Essential glossary
Use the right words for the right decisions.
- SOC
- Estimated state of charge.
- DoD
- Depth of discharge.
- Cycle
- Equivalent charge and discharge sequence.
- Usable energy
- Energy available within defined operating limits.
Further reading
Institutional and technical sources.
ANTA content is an original synthesis. These references support verification and further study.
Turn a subject into a project