Hi,
I have to switch a high current(DC 12V@~60A approx.) for a battery-supplied circuit.
But its on-status resistance should be as low as possible. Because you know the Ohm's Law, the I is going to increase up to even 100 amps sometimes, so a very small resistance creates a big difference.
I don't need a fast switching. My purpose is to turn the circuit off when my battery indicator(made with an opamp as a comparator, it is going to make the signal low when battery voltage is low enough) makes the signal low, to protect the battery from overdischarge.
I have two options:
1) Using a high power relay
The disadvantages of this option are space(it is going to get underwater in a waterproof enclosure and a high power takes up a huge space in the enclosure) and cost.
2) A power MOSFET
I'm not sure this is a perfect option. I would like to use 3 IRFZ44N MOSFETs in parallel(so the RDS(on) will affect the circuit less). But I'm worried about using MOSFETs in parallel.
Which to use for such a purpose? Which one is going to create the minimum resistance?
I have to switch a high current(DC 12V@~60A approx.) for a battery-supplied circuit.
But its on-status resistance should be as low as possible. Because you know the Ohm's Law, the I is going to increase up to even 100 amps sometimes, so a very small resistance creates a big difference.
I don't need a fast switching. My purpose is to turn the circuit off when my battery indicator(made with an opamp as a comparator, it is going to make the signal low when battery voltage is low enough) makes the signal low, to protect the battery from overdischarge.
I have two options:
1) Using a high power relay
The disadvantages of this option are space(it is going to get underwater in a waterproof enclosure and a high power takes up a huge space in the enclosure) and cost.
2) A power MOSFET
I'm not sure this is a perfect option. I would like to use 3 IRFZ44N MOSFETs in parallel(so the RDS(on) will affect the circuit less). But I'm worried about using MOSFETs in parallel.
Which to use for such a purpose? Which one is going to create the minimum resistance?