I have a project (remote gate opener...) I have made good progress but its the first time I have built a charging circuit so I have some questions I need help with.
The battery I am using is a sealed lead acid battery NP1270M datasheet here
The gate will be near a power source and i will supply 18VDC @1.5A as an input to the circuit. The project has a Micro controller so I plan to implement automatic overcharge/undercharge safety. As well as switching I will limit the voltage and current (fixed amount). The battery will never be less than 80% so I was just going to trickle charge at a fixed rate until it reaches a voltage or the voltage no longer increases.
- What voltage should I use for "Fully charged" can't seem to find that anywhere i.e. if reached turn off charging.
- What voltage should I use for under-voltage protection (<12v?)
- What voltage and current should I trickle charge at note: 30% in 8 hours will be quick enough.
I don't understand this from the datasheet:
Thank you in advance for your help.