Hello,
I'm new to the forum and solar power, for a travel around the world on my Vespa for charity against climate change, I'd like to build an emergency battery pack recharged by renewable energies like sun and wind to recharge smartphone etc.
I'm thinking about:
- LiFePo4 (or LiIon) battery pack e.g. 4S2P 18650 12,8V 3600mAh (or bigger)
- balanced charging
- ~3.425V (75% of capacity? or 3.65) charging cut-off
- ~2.975V (25% of capacity? or 2.5) over-discharge protection
- button to display charging information
- multiple charging inputs (solar/wind)
- short protection
So I'd like to buy or to do myself a BMS able to do all these things.
I know that I can charge a lithium cell up to 90% of capacity with only the constant current charging step but I'm not sure what a solar cell outputs, e.g. a 5.5V 1.6W solar cell should output 5.5V@0.29A with the sun at 100%, but with the sun at 50% what's going down, voltage, current or both?
Then how do I handle multiple inputs (solar/wind) that can work one at a time or simultaneously?
Thanks in advance for your help
I'm new to the forum and solar power, for a travel around the world on my Vespa for charity against climate change, I'd like to build an emergency battery pack recharged by renewable energies like sun and wind to recharge smartphone etc.
I'm thinking about:
- LiFePo4 (or LiIon) battery pack e.g. 4S2P 18650 12,8V 3600mAh (or bigger)
- balanced charging
- ~3.425V (75% of capacity? or 3.65) charging cut-off
- ~2.975V (25% of capacity? or 2.5) over-discharge protection
- button to display charging information
- multiple charging inputs (solar/wind)
- short protection
So I'd like to buy or to do myself a BMS able to do all these things.
I know that I can charge a lithium cell up to 90% of capacity with only the constant current charging step but I'm not sure what a solar cell outputs, e.g. a 5.5V 1.6W solar cell should output 5.5V@0.29A with the sun at 100%, but with the sun at 50% what's going down, voltage, current or both?
Then how do I handle multiple inputs (solar/wind) that can work one at a time or simultaneously?
Thanks in advance for your help