If you hook a fully charged 12v battery in series with a discharged 12v battery and hook to a 24v load, you will not charge the discharged battery. Each battery much provide equal current to maintain the 24v. When put under a load, two 12v batteries connected in series will not equalize. When a charger is hooked to one battery in a series setup, it will NEVER charge the other battery. There is a ton of bad info given to the OP in this thread. So you see, it does work and it works just fine. If I take one battery away from each set (disconnect the chargers) then I still have 24vdc at the output cables of the second battery. Now if I take a cable and put it on the + of the second battery set and put a cable on the - of the second set and then measure the voltage I across those two I will have 24 vdc. Then I put a battery cable from the +12 of the first battery set and put it on the -12 of the second set. I take the first two batteries and put them in parallel and the second two batteries and put them in parallel. Now suppose I instead of thinking I'm hooking up chargers I'm thinking I'm hooking up 4 batteries. Let's call the charger a battery for a moment because in a sense, it is. Regular batteries are rechargeable too but wont cycle as many times as a battery rated for recharging. This is you clue to quit paying a bunch of money for rechargeable batteries and just buy the charger. If you were take the batteries out at some point in between you would find that the dead battery was no longer dead but in fact did have a charge. The proof of that is that the bulb is connected to the - of the first battery and the positve of the second. The flashlight will only stay lit half as long as two fully charged batteries and when you take the batteries out both will be dead. The flash light will still work because the full battery will use it's energy to charge the dead battery. 1 of the batteries is fully charged and the second is dead. One way to understand this is if you were to take two 1.5v batteries and put them in a flash light. If you would like, you can download the manual for one of the popular marine multiple battery chargers and it will show you how they are hooked up. This is how a dual battery charger works. If you were to connect the second battery to a second charger in parallel then you would simply double your charging current and charge both batteries faster. The second battery will charge also because it is connected in series with the first battery. No options - charge each battery separatelyĪctually, if the charger is connected to the first battery it will be in parallel with the first battery which will charge it. If there is NOT total isolation electrically between those two charger negative leads, you just made an arc welder.Ħ) From what we know and can gather, the OP has a single bank charger. Therefore when you connect a separate charger to BAT #2 the NEG lead is connected electrically to the POS of BAT #1 as well as the NEG of BAT #2. Now follow this - is not the NEG on BAT #2 also connected by the series jumper to the POS on BAT #1? Of course it is. Keep in mind that the POS and NEG on charger #1 will be connected to POS and NEG on BAT #1. Attempting to charge both will indeed not work.Ĥ) If the charger has two or more outputs, you simply connect each pair to a separate battery.ĥ) As Bruce indicated, be very careful about using two separate (as in two totally separate chargers) to charge a 24 volt series setup. That is not definitive enough.Ģ) Does this charger have one set of outputs, two sets of outputs, three sets of outputs, - what?ģ) If this charger is a single bank, it can ONLY output 12 volts and therefore there is no option of charging both at the same time. Now lets discuss what it is the OP really wants to accomplish or know! We cannot do that until he tells us what type of charger he has.ġ) Yes - he said he has a 12 volt charger. You have a 12 volt system with two batteries in parallel. You have a series system to provide 24 volts. *An additional $40.00 will apply to all residential deliveries of heavy-equipment.You simply cannot have a series/parallel 24 volt system.Applies to direct shipping points within the 48 continental US states. Tansformer/Rectifier Limited Warranty: 5 yrs.500 amp, fully insulated, Flexi-Spring clamps.UL and CSA listed for indoor and outdoor use.Automatic reset AC and DC circuit breakers.UL listed for indoor and outdoor use, "SAFE IN ANY WEATHER." Heavy duty transformer, patented "Sub-Sil" multidiode rectifiers, longer AC cord and the DC leads are standard features for higher performance. The highest performance fleet charger on the market, comes with our best manufacturer's boost rating 600 amps.
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