Question:
i have a vehicle survice van that i use for my bussnes. the vehicles that i survice are all 24v but the van i use is a 12v , i have 2 12v batteries in the back of the van conected together to make it a 24v system, i need to now how to charge these batteries from my vans standard system
Answers:
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take a direct feed from your vehicle 12v battery + and -. to one of the batteries at the rear, whilst your engine is running it will trickle charge your 2 batteries if as you say they are connected together. 12v charging 24v is not a problem just slower!Do them one at a time. You would have to make sure they are wired separately from your vehicle.
It would be fairly easy to build a circuit that would periodically swap the battery that is charging.
Alternatively, you use an inverter.
Or you could fit an auxiliary 24v alternator if you've got room. It would have to share earth with the vehicle, so you'd have to be careful to keep the live wire away from the rest of the vehicle wiring.
1990 bronco 2 with 2.9 liter,it loses oil pressure when it gets hot could this be a sending unit?
Or you might be able to take a 12V AC feed from your alternator, & feed it through a 2:1 transformer then rectify it to DC.
Most alternators don't give easy access to the AC as the rectifier is built in. Depends on how keen you are at hacking.
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You can add a cut off switch between the cable system and re route the wires for 12/24 volts it is the least expensive way... Just route positive to positive negative to negative and be sure it disconnects the vehicle system prior to change over to 24 volts or Purchase a dc to ac converter and plug in a 24 volt charger to charge the batteries..During a passing conversation I seem to remember a late sixties/ early seventies john deere diesel tractor that operated a 24 volt starting system with a 12 volt charging system. You can try your same question on a tractor club, or you can charge your batteries on at a time. Or possibly a cordless drill type charger, possibly a 24 volt dewalt?
1957 John Deere 720 Diesel, has a 24 volt starting system and a 12 volt charging system. You may be able to use the starting solenoid off this tractor.
Little Honda Generator.
You could put them in series for the 24 volt stuff and paralell for charging but the switches will be a problem, like you could easily be talking 100 Amps trying to jump start a Truck.
I think I would connect a couple of medium 30 or so amp cables from the main Battery through a 30 amp fuse to the back, where you take the positive through an On/Off switch to two positive Crocodile clips and the Negative straight to two Black Negative Crocodile clips, then disconnect the Positive to Negative lead from the batteries and connect the new crocodile clip for charging and disconnect the crocodile clips and switch off before you reconnect the Positive to Negative link for 24 volts.
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