Hi all , could anyone tell me how long should i expect a bike charger to take to charge a set of 3 SLA batterys 36volts 10 amp hour total . Batterys being flat at the start of charging .
Thanks
Wizard
Thanks
Wizard
Charging SLAs how long
- Thread starter Wizard9956
- Start date
Depends on the charger, but if its 2 amp hours - which is typical - it would take about 5 hours.
I assume from your question that you're not seeing this happen? SLA batteries don't like being completely flat so its possible they may have failed.
Frank
I assume from your question that you're not seeing this happen? SLA batteries don't like being completely flat so its possible they may have failed.
Frank
Hi Frank , the batterys were according to the green light on the charger fully charged in 3 hours , the charger output is 36volt 1.5 amphour . I find it strange that they charged up so quickly .
atb
Wizard
atb
Wizard
Hi,
what is the make and model of the charger? My own experience with a Currie SLA 24Volt charger and an upmarket SLA 24volt charger on 10AH batteries is that the green light comes on when the battery is charged up to around 80-90% of capacity.
General rule of thumb (as per the good PowerTech SLA battery guide) is that an SLA battery is fully charged when the charging current has dropped to 1% of the Amp-Hours rating of the battery. For example, a 10AH battery is fully charged when the charging current is 100milli-Amps or less.
Charging time is quite dependent on how discharged the SLA batteries were. If your batteries were only around 50% discharged, then 3 hours before the green light comes on is about normal.
I can supply the charging stats for my 24Volt 10AmpHour (AH) batteries if you like.
Paul
what is the make and model of the charger? My own experience with a Currie SLA 24Volt charger and an upmarket SLA 24volt charger on 10AH batteries is that the green light comes on when the battery is charged up to around 80-90% of capacity.
General rule of thumb (as per the good PowerTech SLA battery guide) is that an SLA battery is fully charged when the charging current has dropped to 1% of the Amp-Hours rating of the battery. For example, a 10AH battery is fully charged when the charging current is 100milli-Amps or less.
Charging time is quite dependent on how discharged the SLA batteries were. If your batteries were only around 50% discharged, then 3 hours before the green light comes on is about normal.
I can supply the charging stats for my 24Volt 10AmpHour (AH) batteries if you like.
Paul
Hi Paul , the charger is a 3PXO 36v 1.8A Shenzhen charger , with an output of 36v 1.5A . Is this charger any good ?
atb
Wizard
atb
Wizard
Hi Wizard,
I couldn't find your exact make of SLA charger on the Internet but I suspect from the current rating that it is a standard chinese electric scooter charger that has been rebadged so it would be very similar to the Currie one I had.
Here are my charging stats which I have made independent of the battery voltage so it would apply to your 36V SLA battery.
My remaining 10AH battery capacity at start of charging was between 50% and 70% (approx= 37.5 volts) so it took 2.5 hours before the green light came on. The charging current at the start was 1.7Amps and had dropped to 0.7A when the green light came on. It took another 1.75 hours before the current dropped to 0.1A (=1% of 10AH) so the battery was at full capacity.
My bike manual says the green light indicates 90% charged so what I do now is charge until the green light comes on and then I give it another hour before I stop charging to take it up to somewhere between 90% and 100% of charge.
As a guide, you can always roughly assess how much capacity remains in your battery by measuring the voltage while the bike is not turned on. Here is a simple approximate table:
36V = 20% -> 35%
37.5V = 50% -> 70%
38.5V = 75% -> 90%
39V = 90% or greater.
Hope this helps,
Paul
I couldn't find your exact make of SLA charger on the Internet but I suspect from the current rating that it is a standard chinese electric scooter charger that has been rebadged so it would be very similar to the Currie one I had.
Here are my charging stats which I have made independent of the battery voltage so it would apply to your 36V SLA battery.
My remaining 10AH battery capacity at start of charging was between 50% and 70% (approx= 37.5 volts) so it took 2.5 hours before the green light came on. The charging current at the start was 1.7Amps and had dropped to 0.7A when the green light came on. It took another 1.75 hours before the current dropped to 0.1A (=1% of 10AH) so the battery was at full capacity.
My bike manual says the green light indicates 90% charged so what I do now is charge until the green light comes on and then I give it another hour before I stop charging to take it up to somewhere between 90% and 100% of charge.
As a guide, you can always roughly assess how much capacity remains in your battery by measuring the voltage while the bike is not turned on. Here is a simple approximate table:
36V = 20% -> 35%
37.5V = 50% -> 70%
38.5V = 75% -> 90%
39V = 90% or greater.
Hope this helps,
Paul
Yes, the Shenzen chargers are excellent and very reliable in my experience. The main source for them is Powerstream in the USA, but they don't have that model currently listed.
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