For 20A at 12V R = V/I = 12/20 = 0.
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Hi, I am having Sealed Lead-Acid Rechargeable battery with capacity of 12V / 7.5Ah. I want to connect a load resistor across the battery for discharging. The load resistor
Circuit allows for large initial current (limited by C1 ESR, and source-drain resistance of U2), but keeps
RS PRO Lead Acid Battery - Rechargeable A series of RS PRO rechargeable lead-acid batteries. These batteries are made from an ABS material which greatly increases the strength of the
The valve regulated, spill-proof construction of this 12 volt, 20 ah rechargeable sealed lead acid battery allows trouble-free, safe operation in any position. There is no need to add electrolyte, as gases generated during
Current flow from 12V to ground is I = V/R. R is sum of all resistors in a given series path. For 20A at 12V R = V/I = 12/20 = 0.6 ohms. If you current limit to 20A you are making
The normal internal resistance of a 12v battery can vary depending on the type and age of the battery. However, a healthy 12v lead-acid battery should have an internal resistance of around 3-5 milliohms. What is the internal resistance of a bad battery? A bad battery will have a significantly higher internal resistance than a healthy battery.
Approved for transport by air. D.O.T., I.A.T.A., F.A.A. and C.A.B certified The PS-12200 is part of our PS range of sealed lead acid batteries (often referred to as VRLA) which have been specifically designed for general purpose and standby applications.
Note : The LSLA20-12 is a STANDBY BATTERY, if you require a CYCLIC BATTERY for applications like mobility scooters etc see YUASA REC22-12 or LUCAS LSLC22-12 / LSLC22-12G, using the LSLA20-12 in cyclic / high drain applications may result in a poor lifespan of the battery and this will not be covered under the manufacturers warranty.
The easiest method may be to provide a bank of switched resistors which can be binary switched to limit load current to 20A. A counter counts the resistor value up if the current is too high and down if too low.
If you turn the load fully on and then fully off with a 1:5 duty cycle the average current will be 20 A. I on = 12/0.1 = 120 A ! The battery has to be able to deliver the 120A peaks. Adding an inductor in series with the load, and a "catch diode" turns the circuit into a "buck converter" eg like this
If the load drops most of the voltage then the driver may be able to be built to survive. But if the load drops only a few volts at 20 Amps then the driver will dissipate a large amount of energy. At 20 Amps and 12 volts the circuit will dissipate Power = V x I = 12 x 20 = 240 Watts. That's a substantial amount.