Showing posts with label acid. Show all posts
Showing posts with label acid. Show all posts

Sunday, October 5, 2014

Sealed Lead Acid 12V Battery Charger


Sealed Lead Acid 12V Battery Charger Schematic


There are a cardinal of credibility we allegation to awning about the affliction and use of Sealed Lead Acid batteries.

Firstly, these batteries allegation be charged, absolved and stored actual carefully.

We commonly anticipate batteries can be stored for months (if not years) and they will be accessible for actual use.

This is not the case with SLA batteries.

If you abundance a NEW, abounding answerable SLA array for 6 months or more, you will acquisition it may be absolutely discharged.

You may additionally acquisition you cannot allegation it!! It may be worthless.

Thats how aerial SLA batteries are.

They allegation be answerable on a approved base to anticipate them absolution to a actual low voltage level.

If the terminal voltage of a SLA array is accustomed to go beneath 8v, a action alleged SULPHATION starts to awning the apparent of the plates and prevents the array actuality re-charged. The centralized attrition of the array increases and it becomes useless. See articles Sealed Lead Acid Array Charger on Amazon

Parts List of SLA Array Charger

2 - 1R8 0.5watt resistors

1 - 150R 0.25 watt resistor

1 - 180R

1 - 560R

1 - 1k5

3 - 2k2

1 - 3k3

1 - 4k7

1 - 8k2

1 - 1k mini trim pot

1 - 1n ceramic

2 - 47u 25v electrolytics

1 - 5mm red LED

4 - 1N4148 arresting diodes

1 - 10v 0.25watt zener

1 - BC 547 transistor

2 - BC557 transistors

1 - MCR100-6 SCR

1 - 1m red lead

1 - 1m atramentous lead

2 - alligator clips

1 - 2m actual accomplished solder

1 - SLA Array Charger PCB

Also required:

1 - 12v AC agent (500mA AC)

1 - ability lead

1 - case
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Friday, August 15, 2014

24V 7AH Lead Acid Battery Charger Circuit

24V/7AH Lead Acid Battery Charger Circuit

The circuit given here current lead acid battery charger famous variable voltage regulator IC LM 317. The charging current depends on of resistor R2 and here its set to be 700mA. Resistor R3 and POT R4 determines the charging voltage. Transformer T1 steps down the mains voltage and bridge D1 of rectification. C1 filter capacitor. Diode D1 prevents the reverse flow of current from the battery when charger is or when mains power .



Notes.
  • Assemble the circuit on a good quality PCB.
  • T1 can be a 230V primary, 35V/3A secondary step down transformer.
  • If 3A Bridge is not available, make one using four 1N5003 diodes.
  • LM317 must be fitted with a heat sink.
  • R2 = 0.85 ohm is not a standard value. You can obtain it by combining a 6.2 ohm and 1 ohm resistors in parallel.
  • F1 can be a 2A fuse.
  • To setup the charging voltage, power ON the charger and hook up a voltmeter across the output terminals and adjust R4 to make the voltmeter read 28V. Now the charger is ready and you can connect the batteries.
  • This charger is specifically designed for two 12V/7AH/6 cell lead acid batteries in series OR a 24V/7AH/12 cell lead acid battery.
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