Batteries
Battery Self-Discharge Calculator
Use Battery Self-Discharge Calculator when the question is to calculate capacity remaining from initial capacity and monthly loss and the inputs come from one consistent source case.
Set up the Battery Self-Discharge case
Keep Battery Self-Discharge units and measurement conditions consistent before comparing capacity remaining.
Set up Battery Self-Discharge carefully
The setup starts with Initial capacity, and Monthly loss. Keep those entries on one unit basis before the formula is evaluated.
- Initial capacity: 100 Ah in the sample case.
- Monthly loss: 3% in the sample case.
What capacity remaining means here
This worksheet is for calculate capacity remaining from initial capacity and monthly loss. The answer is easier to trust when the entered values describe the same equipment, period, and operating condition.
Battery Self-Discharge depends on battery chemistry, state of charge, temperature, age, and the discharge or charge rate.
If two cases differ in initial capacity, save them as separate runs. A blended entry can hide the reason the capacity remaining changed.
Use Battery C-Rate for that neighboring calculation rather than adding unstated assumptions here.
Using the Battery Self-Discharge answer
Read capacity remaining together with the input values, not as a standalone fact. The same number can imply different decisions under a different equipment rating or operating period.
Changing initial capacity while leaving monthly loss fixed is a useful way to see which assumption controls the answer.
Use Battery Capacity Fade for that neighboring calculation rather than adding unstated assumptions here.
Testing initial capacity
Using the sample values, Initial capacity = 100 Ah; Monthly loss = 3%, the primary result is 97.00 Ah.
This Battery Self-Discharge one-input test is a scale check, showing direction and sensitivity without turning the changed case into a recommendation.
If the changed monthly loss comes from a real measurement, keep the original Battery Self-Discharge run so the source of the difference remains clear.
Checks outside Battery Self-Discharge
Temperature and storage duration change self-discharge.
- Manufacturer test conditions
- Voltage sag under load
- Aging and capacity fade
A numerically valid Battery Self-Discharge result can still be wrong if the field condition, connection type, tariff period, or equipment rating does not match.
If the next check belongs there, open Battery State of Charge and keep Battery Self-Discharge as the baseline.
Before saving capacity remaining
Can this replace a design review?
No. Treat Battery Self-Discharge as arithmetic support; ratings, safety factors, code requirements, and manufacturer limits still need review.
Why did the answer move so much after one input changed?
Many electrical relationships are proportional, inverse, squared, or tied to a denominator. A small change in monthly loss can have a visible effect when the other entries stay fixed.