Heyy,

I would like to use this UPS (http://www.chinfa.com/04product/down...0ups/dru30.pdf) to recharge two batteries type AGM 12Ah 12V, on the datasheet it is marked that the charging current is 2.5A for 12Ah I would like to know if this battery will be suitable for my application (https://docs-emea.rs-online.com/webd...6b81580e6f.pdf)
The battery will take over 15 min in case of cut of the main power taking into account the effect peukert if the load pulls a current of 25A, I would like to know if there is a formula which allows to estimate the charging time of the battery.

http://www.chinfa.com/04product/down...0ups/dru30.pdf -> UPS
https://docs-emea.rs-online.com/webd...6b81580e6f.pdf -> AGM Battery

Thank you in advance,

 

Heyy,

I would like to use this UPS (http://www.chinfa.com/04product/down...0ups/dru30.pdf) to recharge two batteries type AGM 12Ah 12V, on the datasheet it is marked that the charging current is 2.5A for 12Ah I would like to know if this battery will be suitable for my application (https://docs-emea.rs-online.com/webd...6b81580e6f.pdf)
The battery will take over 15 min in case of cut of the main power taking into account the effect peukert if the load pulls a current of 25A, I would like to know if there is a formula which allows to estimate the charging time of the battery.

http://www.chinfa.com/04product/down...0ups/dru30.pdf -> UPS
https://docs-emea.rs-online.com/webd...6b81580e6f.pdf -> AGM Battery

Thank you in advance,

The listed charging current is a maximum value, not a specific requirement, Thus you can charge your battery at a lower rate and usually get a longer standby life, which may be important to you. The area that I would caution you about is the thermal run time considerations of the UPS. Heat sinks cost money and so mostly, in a UPS, the heat sinks are minimal, as a cost saving. So while the battery may hold up the rest of the system may suffer from more heat than it should have to bear.
I hope that this answer is a bit helpful.

 

The listed charging current is a maximum value, not a specific requirement, Thus you can charge your battery at a lower rate and usually get a longer standby life, which may be important to you. The area that I would caution you about is the thermal run time considerations of the UPS. Heat sinks cost money and so mostly, in a UPS, the heat sinks are minimal, as a cost saving. So while the battery may hold up the rest of the system may suffer from more heat than it should have to bear.
I hope that this answer is a bit helpful.

Thank you very much

 

Thank you very much

For recharging a battery the simple calculation that delivers reasonable results is that amp-hours in will be about the same as amp hours out if the losses are ignored. But heating can't be ignored, so we can assume about 10% extra time in addition to the amp hours calculation. So the 2.5 amps charge rate would recharge the 12 amp hour battery in a bit less than 5 hours, except that the heating loss will bring the time up some. But it is rather important to stop charging the battery at the higher charge rate as it reaches full charge. For two batteries charged at the same time, if the charging current divides equally, the time would be twice as long. At least that is the approximation.
I suggest asking the battery manufacturer what they recommend for best battery life.

 

I have a 12V*2 18 A.h battery that i want to charge with an UPS. The panel has an output of aprox 27.5V the current is about 2.5A when charging the battery.
However i have my doubts that the battery is being correctly charger.

Anyway my question is:
Is there a minimum current to charge a battery Lead acid?

 

I have a 12V*2 18 A.h battery that i want to charge with an UPS. The panel has an output of aprox 27.5V the current is about 2.5A when charging the battery.
However i have my doubts that the battery is being correctly charger.

Anyway my question is:
Is there a minimum current to charge a battery Lead acid?

I have not seen any specification of a minimum charge rate, primarily up to some limit the only effect is longer charging times. A recommended rate for charging is one-tenth of the amp-hours rate. So with the 18 amp-hour battery that rate would be 1.8 amps. A lower charge rate will take longer but also allow a better absorbtion of the charge. So the only down-side of that lower charging rate is longer charge times.