It might work since you have 2 batteries. Even if 35 amps doesn't keep up with the electric pumps and fans it is still adding a charge back to the battery. If you have a voltmeter on the car you'll be able to see if you're losing charge during a race or staying even. If you want to be more scientific about it buy an inexpensive amp clamp gauge and check to see what is happening when the car is running and everything is on. Or install an ammeter into the system (can be tricky to do on a race car) and then you'll know if you are charging or discharging.