Lead-acid-battery-dat
charge board
Batteries store the energy produced by your solar panels for later use.
Types:
General Lead-Acid Batteries:
Common in automotive applications. They are relatively inexpensive and the technology is mature. However, they are heavy, have a shorter lifespan (approx. 3 years), require maintenance, and are not suitable for frequent deep discharge (recommended depth of discharge is ~20%).
Deep Cycle Lead-Acid Batteries:
Designed for deep discharge (up to 80% or more) without significantly affecting lifespan. They have thicker plates and durable materials, making them well-suited for solar power systems, electric vehicles, and campers requiring continuous, stable power.
Capacity: Measured in Amp-hours (Ah). A 12V 100Ah battery stores 12V * 100Ah = 1200 Watt-hours (Wh) of energy.
lead-acid-battery-dat
- LAB: Lead-Acid Battery
蓄电池 (xù diàn chí) is the Chinese term for "rechargeable battery." It is a type of electrical battery that can be recharged multiple times. It is commonly used in various electronic devices such as mobile phones, laptops, electric vehicles, and many other portable devices.
Here are some links where you can find more information about 蓄电池:
Wikipedia: Rechargeable Battery - https://zh.wikipedia.org/wiki/%E8%93%84%E7%94%B5%E6%B1%A0
- China Battery Industry Association - http://www.cbia.com.cn/
- Battery University: Rechargeable Batteries - https://batteryuniversity.com/learn/article/types_of_rechargeable_batteries
voltage
- 12V == solar-power-dat
- 72V == motor-dat
LAB Example
2.6 Ah = 2.6 × 1000 = 2600 mAh
- Brand: ANJING
- Type: Sealed Rechargeable Battery (Likely SLA/VRLA) Sealed Lead-Acid (a specific type, but often used generally)
- Nominal Voltage: 12V
- Capacity: 2.6Ah (Rated at 20-hour discharge rate - 12V 2.6Ah/20hr)
- This implies a discharge current of 0.13A (2.6Ah / 20h) for 20 hours.
- Charging Method: Constant Voltage Charge
- Standby Use (Float): 13.50V - 13.80V
- Cycle Use: 14.40V - 15.00V
- Initial Charging Current: Less than 0.78A (0.3C)
- Chemistry: Lead-acid (Pb symbol present)
- Markings:
- Recycling symbol
- Do not dispose symbol (crossed-out bin)
As noted on the battery (12V2.6Ah/20hr), this specific 2.6Ah rating was determined using a 20-hour discharge period. This means it was likely discharged at a current of 0.13A (2.6Ah / 20h = 0.13A) for 20 hours.
Estimated Runtime Calculation
This calculation estimates how long the ANJING 12V 2.6Ah battery can power a 5V 1A load using a DC-DC converter.
1. Calculate Load Power:
- Load Voltage (V_load) = 5V
- Load Current (I_load) = 1A
- Load Power (P_load) = V_load × I_load = 5V × 1A = 5 Watts
2. Account for DC-DC Converter Efficiency:
- Assume a typical converter efficiency (η) = 85% (or 0.85). Real-world efficiency may vary.
- Power drawn from the battery (P_batt) = P_load / η
- P_batt = 5W / 0.85 ≈ 5.88 Watts
3. Calculate Current Drawn from Battery:
- Battery Nominal Voltage (V_batt) = 12V
- Current drawn from battery (I_batt) = P_batt / V_batt
- I_batt = 5.88W / 12V ≈ 0.49 Amps
4. Compare to Rated Discharge:
- The battery's capacity (2.6Ah) is rated for a 20-hour discharge (as noted in the file:
12V2.6Ah/20hr). - Rated Discharge Current (I_rated) = 2.6Ah / 20h = 0.13 Amps
- The calculated draw (0.49A) is significantly higher than the rated discharge current (0.13A).
5. Calculate Ideal Runtime (Ignoring Peukert's Effect):
- Battery Capacity (C) = 2.6Ah
- Ideal Runtime (T_ideal) = C / I_batt
- T_ideal = 2.6Ah / 0.49A ≈ 5.3 hours
6. Consider Peukert's Effect:
- Lead-acid batteries deliver less total capacity when discharged at rates higher than their rating (Peukert's Law).
- Since 0.49A is much higher than the 0.13A rating, the effective capacity will be lower than 2.6Ah.
Conclusion:
The ideal calculated runtime is approximately 5.3 hours. However, due to the higher discharge current (0.49A vs. the 0.13A rating), the actual runtime will be noticeably less than 5.3 hours. The exact reduction depends on the specific Peukert exponent of this battery model, which is not provided.