Hello
We have a startup project includes some wifi modules. These wifi modules working on 250mA. The module is isolated with an industrial box and it contains a wifi module circuit board, an SLA (selaed acid battery) battery and a relay. The modules will work as 7/24, they must be alive all the day and night, outdoor. We are not good at power electronics, so any useful recommendation here can work for us I guess, I wish.
Here the conditions:
1) We need 4.75V input minimum, the board has a 3.3V regulator, so we want to use 6V battery to feed the circuit board
2) We assume solar panel will get sunlight for 8 hours max in a day. So the battery must be recharged as much as fast but without damaging the battery
3) There is writing 20 hours on the SLA batteries mostly. It is optimal recharging duration as far as I researched but it is too long for recharging conditions. Also there is C/3 rule (capacity / 3) for the maximum constant current while charging the battery without damage, as far as I researched again.
4) The circuit board wasting 250mA and it will mean discharging the battery about 4A in 16 hours without recharging, according to the 24 hours - 8 hours sunlight (max) calculation (please see previous note).
Here the questions:
1) What should be minimum battery capacity for the life cycle without any shutdown? 4A, 6A, maybe 12A but it is so big, meaning the box will be very big for only that, it is a bad thing I think.
2) What is healthy charging time for the batteries? I mean the battery you will suggest as capacity
3) What kind of solar panel (also how powerfull do I need, how many Watts?) should be used?
4) Should I use a solar panel charger (please recommend a widely accessible one, also must be cost effective) or design my own circuit (please share a schema if possible)
5) Can I use a solar panel both for charging and feeding the circuit board if getting enough sunlight (maybe also means can effect recharging duration), otherwise feed with battery. Atleast using the solar energy directly if the battery is full but still good solar energy available, can be very useful. We just can't deal the what kind of circuit schematic since we are not good at power electronics, and dont want to damage the batteries, also maybe dangerious like explosion, I dont know, forgive me. I have any experience about it, all I know is using the voltage regulators when I need
The topic is a bit urgent. Awaiting your helps.
Best regards
We have a startup project includes some wifi modules. These wifi modules working on 250mA. The module is isolated with an industrial box and it contains a wifi module circuit board, an SLA (selaed acid battery) battery and a relay. The modules will work as 7/24, they must be alive all the day and night, outdoor. We are not good at power electronics, so any useful recommendation here can work for us I guess, I wish.
Here the conditions:
1) We need 4.75V input minimum, the board has a 3.3V regulator, so we want to use 6V battery to feed the circuit board
2) We assume solar panel will get sunlight for 8 hours max in a day. So the battery must be recharged as much as fast but without damaging the battery
3) There is writing 20 hours on the SLA batteries mostly. It is optimal recharging duration as far as I researched but it is too long for recharging conditions. Also there is C/3 rule (capacity / 3) for the maximum constant current while charging the battery without damage, as far as I researched again.
4) The circuit board wasting 250mA and it will mean discharging the battery about 4A in 16 hours without recharging, according to the 24 hours - 8 hours sunlight (max) calculation (please see previous note).
Here the questions:
1) What should be minimum battery capacity for the life cycle without any shutdown? 4A, 6A, maybe 12A but it is so big, meaning the box will be very big for only that, it is a bad thing I think.
2) What is healthy charging time for the batteries? I mean the battery you will suggest as capacity
3) What kind of solar panel (also how powerfull do I need, how many Watts?) should be used?
4) Should I use a solar panel charger (please recommend a widely accessible one, also must be cost effective) or design my own circuit (please share a schema if possible)
5) Can I use a solar panel both for charging and feeding the circuit board if getting enough sunlight (maybe also means can effect recharging duration), otherwise feed with battery. Atleast using the solar energy directly if the battery is full but still good solar energy available, can be very useful. We just can't deal the what kind of circuit schematic since we are not good at power electronics, and dont want to damage the batteries, also maybe dangerious like explosion, I dont know, forgive me. I have any experience about it, all I know is using the voltage regulators when I need
The topic is a bit urgent. Awaiting your helps.
Best regards