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Hi All! I have a?76Citicar with 8 6v deep cycle GC2 Interstate batteries. Batteries are 2 years old with next to no use of them. I let the car and batteries sit for 8-10 months in heated/cooled garage. Then I drove citicar up and down the block twice and a few times on jack stands before putting batteries away for the second winter. So the batteries went a year without touching them I believe and then charged during the second winter and again in the spring before I put them in the car. Curtis 1204 Electronic controller. What would the experts think is the problem in the following:

Seems batteries can go bad quick if abused.? I'd pickup a battery hydrometer and check each cell.? Get a nicer one because cheap ones are awful to work with.? As far as voltage drop, I think that would normal under load. So that does not worry me.? But a bad cell could make it worst.? Does the??Curtis 1204 vary the speed OK?? Things you could do is upgrade cables all the way around.

Bart

That voltage drop across an IGBT with several hundred amps flowing through the gang is about.

Your batteries are undoubtedly at least partially sulfated. If they were 6 volt batteries, I'd recommend a pulse desulfator. About all I can recommend is a long slow trickle charge at an amp or two. Keep an eye on the electrolyte level, as the batteries will gas.

Look here for some good stuff.



The Bureau of Reclamation's Battery Maintenance manual is excellent. And there are plans for a voltage - independent pulser.

You're going to hate those 8 volt batteries!

They lack enough plate area to supply the current needed for brisk acceleration. And drawing more than their rated max current results in short lives.

I follow my father's advice, "If you buy the best, you don't have to buy twice". For a wet battery, Trojan can't be beaten. For a dry AGM battery, the Enersys Genesis is simply the best. My 2012 Ford F150 that I bought new is set up as a contractor's truck. The battery is HUGE. The OEM battery lasted 6 years! I bought a Genesys on Amazon (free Prime shipping!)

A simply amazing battery. I left the headlights on for 24 hours. Spun that engine right up!

You won't be very fond of the electronic controller either. I have a set of Tong Testers clamp-on ammeters. These purely magnetomechnical instruments use absolutely no wires. (BTW, if you want to see just how wrong Wikipedia can be, look up Tong Testers. Not a word of that article is correct.)

With Trojans and the contact controller, I floored it. The 1000 amp Tester hard-pegged. Electronic controllers are usually 450 amps or 600 amps. In a series motor, torque varies as the square of the amps so the lower amperage controllers will not be satisfying.

I was so pissed after I installed a 72 volt, 450 amp controller that I designed a controller bypass switch. A microswitch is tripped at full throttle. If the motor voltage is high enough to safely do so, the electronics energize a contactor that completely bypasses the controller.

John