At Lento Industries Private Limited, we believe that reliable power should never depend on unstable electricity supply. With the growing adoption of solar energy across homes, offices, industries, and rural locations, charging inverter batteries using solar panels has become one of the most efficient and sustainable solutions.

However, solar charging must be done correctly and safely. Improper connections, wrong controller selection, or battery mismatch can significantly reduce battery life and system performance. As a solar and inverter manufacturing company, Lento Industries brings you this detailed, practical guide to help you charge your inverter battery with a solar panel the right way.

Why Solar Charging Is the Smart Choice for Inverter Batteries

Solar panels generate clean, renewable DC power from sunlight, making them ideal for charging inverter batteries without relying on grid electricity. When integrated correctly, solar charging not only ensures uninterrupted backup but also extends battery lifespan and reduces electricity costs.

At Lento Industries, our solar-compatible inverters and batteries are designed to work efficiently with properly configured solar charging systems, ensuring long-term reliability even in challenging power conditions.

Components Required for Solar Charging (Lento-Recommended Setup)

To charge an inverter battery using solar energy, the following components are essential:

1. High-Efficiency Solar Panel

2. Solar Charge Controller (PWM or MPPT)

3. Inverter Battery (Tubular / SMF / Lithium)

4. Proper DC Cables & Protection Accessories

Among these, the solar charge controller plays the most critical role. It regulates voltage and current to protect the battery from overcharging, overheating, and reverse current flow.

👉 Lento Industries strongly recommends MPPT charge controllers for better efficiency and faster charging.

Correct Solar Charging Connection (Industry-Approved Method)

The only safe and recommended connection method is:

Solar Panel → Solar Charge Controller → Inverter Battery

This configuration ensures:

• Stable and regulated charging

• Protection against battery damage

• Improved charging efficiency

• Longer battery service life

⚠️ Never connect a solar panel directly to an inverter battery.
This is one of the most common causes of premature battery failure we see in the field.

Step-by-Step Guide to Charging an Inverter Battery with a Solar Panel

Step 1: Select the Right Solar Panel Capacity

Solar panel size should match battery capacity and usage requirements.

Lento Industry Guideline:

• 150Ah battery → 300–400W solar panel

• 200Ah battery → 400–500W solar panel

Proper sizing ensures efficient charging without excessive delays or stress on the battery.

Step 2: Choose the Right Solar Charge Controller

• PWM Controller: Suitable for small or basic setups

• MPPT Controller: Highly efficient, recommended for professional systems

For lithium batteries, only use lithium-compatible MPPT controllers approved for inverter applications.

Step 3: Connect Solar Panel to Charge Controller

• Match polarity correctly

• Use proper DC-rated cables

• Ensure tight, secure connections

This step allows the controller to stabilize the solar input before sending power to the battery.

Step 4: Connect Charge Controller to Battery

• Confirm system voltage (12V or 24V)

• Double-check polarity

• Power ON the controller

Once connected, the controller automatically manages the charging cycle.

Step 5: Monitor Charging Performance

Modern controllers provide:

• LED indicators

• LCD display

• Mobile monitoring (advanced MPPT models)

Regular monitoring helps detect faults early and ensures optimal system performance.

Battery Type–Wise Solar Charging Guidance (By Lento Experts)

Tubular Inverter Batteries

Tubular batteries are the most suitable for solar charging due to their deep-cycle construction.

Lento Recommendation:

• Use MPPT controller

• Ensure proper ventilation

• Check electrolyte levels periodically

When charged via solar, tubular batteries deliver maximum lifespan and consistent backup.

SMF (Sealed Maintenance-Free) Batteries

SMF batteries require precise voltage regulation.

Key points from Lento Industries:

• Controller must support SMF charging profile

• Avoid overcharging

• Maintain stable operating temperature

Solar charging is safe and effective for SMF batteries only with proper regulation.

Lithium-Ion Inverter Batteries

Lithium batteries are advanced but require strict charging control.

Mandatory requirements:

• Lithium-compatible MPPT controller

• Built-in BMS support

• Manufacturer-defined voltage limits

Improper solar charging can permanently damage lithium batteries. Always follow approved configurations.

12V vs 24V Solar Charging Systems

12V Systems

• Common in residential setups

• Easy installation

• Compatible with most small solar systems

24V Systems

• Used in commercial and industrial applications

• Requires series-connected panels or batteries

• Needs dedicated 24V charge controller

At Lento Industries, we design inverter systems optimized for both 12V and 24V solar configurations.

Common Solar Charging Mistakes to Avoid

From our industry experience, the most common mistakes include:

• Direct panel-to-battery connection

• Incorrect controller rating

• Mismatched voltage systems

• Poor cable quality causing voltage drop

• Ignoring controller configuration settings

Avoiding these errors ensures safety and long-term performance.

Benefits of Solar Charging with Lento Power Solutions

Charging inverter batteries using solar energy offers:

• Reduced electricity dependency

• Lower operational costs

• Environment-friendly power generation

• Reliable backup during long outages

• Improved battery life

When combined with Lento Industries’ solar-compatible inverters and batteries, the benefits multiply.

Expert Tips from Lento Industries

• Always prefer MPPT charge controllers

• Keep solar panels clean for maximum efficiency

• Avoid frequent deep discharge

• Ensure proper ventilation for batteries

• Schedule periodic system inspections

These best practices help maintain consistent performance year after year.

Conclusion

Charging an inverter battery with a solar panel is one of the most efficient and future-ready power solutions available today. However, the success of solar charging depends on correct component selection, proper installation, and battery-specific charging profiles.

At Lento Industries Private Limited, we design and manufacture solar and inverter solutions that support safe, efficient, and long-lasting solar charging systems. When done right, solar charging not only ensures uninterrupted power but also protects your battery investment for the long term.