GEL Batteries
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What is a GEL battery?
A GEL battery is a sealed monoblock accumulator whose electrolyte is gelified. Being airtight and recombining gases internally, it does not require water replenishment or periodic maintenance. Its strength lies in its resistance to deep discharges and stability over thousands of cycles, making it very suitable for off-grid solar installations with daily consumption, caravans, and boats.
Advantages of GEL batteries
- Maintenance-free: sealed casing, no electrolyte replenishment.
- Great cycle durability: excellent performance with repeated deep discharges.
- Low self-discharge: retain charge during periods of inactivity.
- Safe and clean: minimal gas emission under normal conditions.
- Thermally stable: good performance in moderate temperature ranges.
Recommended applications
- Homes or cabins in off-grid self-consumption with daily use.
- Caravans and campers prioritizing autonomy and low maintenance.
- Recreational boating where reliability and vibration resistance are valued.
- Backup systems (SAI/UPS) with sustained discharges.
GEL vs. other monoblock technologies
- GEL vs Flooded lead-acid: GEL is sealed and maintenance-free; flooded lead-acid is more economical but requires ventilation and periodic care.
- GEL vs AGM: AGM allows for somewhat better current peaks (starting), while GEL usually offers longer deep cycle life and better tolerance to long discharges.
Specifications and compatibilities
| Typical voltages | 12V (and 6V in some models) |
| Usage profile | Daily deep cycle, sustained consumption |
| Maintenance | Maintenance-free (sealed) |
| Recommended charging | Specific GEL curve in MPPT charge controllers and inverter chargers |
| Current peaks | Lower than AGM; prioritizes stability and cycle life |
Selection and installation tips
- Size by usable capacity (Ah) and expected DoD to extend service life.
- Set the GEL charging profile in your charger/controller to avoid overcharging.
- Avoid continuous extreme temperatures; prioritize installation in a ventilated indoor area.
- If you need high current peaks for starting, consider AGM; for maximum cycle durability, GEL is excellent.
In summary, GEL batteries are the best monoblock option when seeking long deep cycle life, safety, and zero maintenance. For sealed alternatives with better peak response, see AGM; for a lower price and accepting maintenance, check flooded lead-acid.
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