I need to place an access controller in my home front door.
All the components are on it's way and I went to the Wiegand ones which is secure.
It's necessary to see that these should be on a back up type supply.
I have seen a lot of the PSU with 12V7AH SLA charger ones. Basically same theory as UPS but not that good.
I am saying not that good as even thought the seller says it has battery protection features I doubt it is but a basic 12V charger which can be adjusted to 14V if desired. I guess it's nothing but a 3A to 5A PSU.
An APC UPS is better in all sense than these power supplies. I know. I can tap of 12V from battery to run the access controller, no problem.
One problem as power cut is once in a blue moon the battery as always on charge. As like all my UPS. I always discharge the battery in the UPS once a month to keep them cycled. But I cannot do that in an access controller, I know I can't so I am looking for a solution. I need back up as my access controller is fail secure type. No power no one goes in or out, you know.
The controller only draws a noticeable current like 1Amp during unlocking and all the other times it is just idling, that is the control board draws at around 100mA and a few more for the card reader.
Method 1.
My plan is to use the 12V7AH SLA to power the system always and use a SLA charger to charge the battery. Charger is not always on line but switches on and off after monitoring the battery voltage. I can make the charger and the monitoring circuit, no problem.
Method 2.
Use a UPS, tap of from battery or use a PSU which is powered from the UPS.
Method 2 is how UPS is actually used but as far as I have seen the continues usage of UPS without monthly discharge seems to bulge the battery with in a year or so.
And it is heavier and takes more space.
Question....what do you suggest.
Method 1 will always cycle the battery. As the system is powered from battery putting a continues drain on it and will charge if below the discharge thresh hold. Of course during charging the charger will supply the access controller.
All the components are on it's way and I went to the Wiegand ones which is secure.
It's necessary to see that these should be on a back up type supply.
I have seen a lot of the PSU with 12V7AH SLA charger ones. Basically same theory as UPS but not that good.
I am saying not that good as even thought the seller says it has battery protection features I doubt it is but a basic 12V charger which can be adjusted to 14V if desired. I guess it's nothing but a 3A to 5A PSU.
An APC UPS is better in all sense than these power supplies. I know. I can tap of 12V from battery to run the access controller, no problem.
One problem as power cut is once in a blue moon the battery as always on charge. As like all my UPS. I always discharge the battery in the UPS once a month to keep them cycled. But I cannot do that in an access controller, I know I can't so I am looking for a solution. I need back up as my access controller is fail secure type. No power no one goes in or out, you know.
The controller only draws a noticeable current like 1Amp during unlocking and all the other times it is just idling, that is the control board draws at around 100mA and a few more for the card reader.
Method 1.
My plan is to use the 12V7AH SLA to power the system always and use a SLA charger to charge the battery. Charger is not always on line but switches on and off after monitoring the battery voltage. I can make the charger and the monitoring circuit, no problem.
Method 2.
Use a UPS, tap of from battery or use a PSU which is powered from the UPS.
Method 2 is how UPS is actually used but as far as I have seen the continues usage of UPS without monthly discharge seems to bulge the battery with in a year or so.
And it is heavier and takes more space.
Question....what do you suggest.
Method 1 will always cycle the battery. As the system is powered from battery putting a continues drain on it and will charge if below the discharge thresh hold. Of course during charging the charger will supply the access controller.