Choosing the right battery is one of the most important decisions when setting up solar power for your RV. The two most common options are AGM batteries and lithium batteries, and each has advantages depending on your needs.
What Are AGM Batteries?
AGM (Absorbent Glass Mat) batteries are a type of sealed lead-acid battery commonly used in RVs.
Pros
- Lower upfront cost
- Widely available
- Reliable for basic use
Cons
- Heavier
- Shorter lifespan
- Limited usable capacity
What Are Lithium Batteries?
Lithium (LiFePO4) batteries are newer and more advanced.
Pros
- Lightweight
- Longer lifespan
- Faster charging
- More usable capacity
Cons
- Higher upfront cost
Key Differences
| Feature | AGM | Lithium |
|---|---|---|
| Lifespan | Shorter | Much longer |
| Weight | Heavy | Light |
| Usable Capacity | ~50% | 80–100% |
| Cost | Lower upfront | Higher upfront |
Which Should You Choose?
Choose AGM If:
- You’re on a budget
- You camp occasionally
- You don’t need heavy power use
Choose Lithium If:
- You camp off-grid frequently
- You want long-term reliability
- You use solar regularly
Final Recommendation
For most serious RV solar setups, lithium batteries are the better long-term choice, while AGM works well for basic and budget setups.