Why Mixing Battery Types in Your Solar Power System is a Bad Idea

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One of my clients asked if he could use an AGM battery alongside the tubular battery he is already using in his system. I advised him against it, and here are the reasons why combining different battery types in the same system is not recommended:


Combining an AGM (Absorbent Glass Mat) battery with a tubular battery in a solar power system is generally not recommended. Here are some reasons why:


1. Different Charging Requirements: AGM and tubular batteries have different charging profiles. AGM batteries typically require a specific charging voltage and current, which differs from the requirements of tubular batteries. Using them together can lead to improper charging, reducing the lifespan and efficiency of both types of batteries.


2. Different Discharge Characteristics: The discharge rates and depth of discharge capabilities vary between AGM and tubular batteries. AGM batteries are usually designed for lower discharge rates and shallower cycles, while tubular batteries can handle deeper discharges. Combining them can lead to inefficient energy usage.


3. Battery Management System (BMS) Issues: A BMS designed for one type of battery may not properly manage the other type. This can result in overcharging, undercharging, or uneven wear, which compromises the safety and efficiency of the system.


4. Maintenance Differences: AGM batteries are typically maintenance-free, while tubular batteries may require periodic maintenance (like checking electrolyte levels). This difference can complicate the maintenance schedule and procedures for the system.


If you need to expand your battery capacity or upgrade your solar power system, it’s best to use batteries of the same type, make, and model. This ensures compatibility and optimal performance. If you already have a mix of battery types and must use them together, consider setting up separate charge controllers and management systems for each type to ensure they are charged and managed correctly. Consulting with a solar energy professional is also advisable to design a system that maximizes efficiency and longevity.

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