Power Inverter Battery Calculator for Solar System

Battery Capacity Formula:

\[ \text{Battery Capacity (Ah)} = \frac{\text{Solar Inverter W} \times \text{Autonomy h}}{\text{V}} \]

Battery Capacity (Ah):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Power Inverter Battery Calculator?

The Power Inverter Battery Calculator helps determine the battery capacity needed for a solar power system based on your inverter's power requirements, desired autonomy hours, and system voltage.

2. How Does the Calculator Work?

The calculator uses the following formula:

\[ \text{Battery Capacity (Ah)} = \frac{\text{Solar Inverter W} \times \text{Autonomy h}}{\text{V}} \]

Where:

\( \text{Solar Inverter W} \) — Power rating of your solar inverter in watts
\( \text{Autonomy h} \) — Number of hours you want the system to run without solar input
\( \text{V} \) — System voltage (typically 12V, 24V, or 48V for solar systems)

Explanation: The formula calculates the amp-hour (Ah) capacity needed to support your inverter's power draw for the specified autonomy period at your system voltage.

3. Importance of Battery Capacity Calculation

Details: Proper battery sizing is crucial for solar systems to ensure reliable power during periods without sunlight and to prevent battery damage from over-discharge.

4. Using the Calculator

Tips: Enter your inverter's continuous power rating in watts, desired backup time in hours, and system voltage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is autonomy hours?
A: Autonomy hours refer to how long your battery should power the system without any solar input (e.g., during nighttime or cloudy days).

Q2: Should I add a safety margin to the calculated capacity?
A: Yes, it's recommended to add 20-30% to account for battery aging, inefficiencies, and unexpected loads.

Q3: What's the difference between inverter watts and solar panel watts?
A: Inverter watts indicate how much power it can deliver to loads, while solar panel watts indicate how much power it can generate under ideal conditions.

Q4: How does system voltage affect battery capacity?
A: Higher system voltages require lower Ah capacities for the same power (watts), as power = voltage × current.

Q5: Can I use this for lead-acid and lithium batteries?
A: Yes, but remember lithium batteries can typically discharge deeper (80-90%) than lead-acid (50%) without damage.