this adds the extra time for absorbtion and top-up. a 240Ah bank will take approx 48hrs to completely recharge. take the total capacity an divide by number of batteries: 6A ea. eg 12v 4battery bank charger food for series applications with 24A capacity. There are some with the proper protection built in but are still not effective due to the low charge rates. this creates a circuit through the ground and shorts out battery 1.īank chargers in general share the same sources so are not good for series banks. This is because if as others have stated, charger 1 has a negitiv lead to ground connection and you add charger 2 to battery 2 the charger 2 negitive lead being also grounded is now also attached to the positve lead of battery 1. It is very important that whatever chargers you use have floating leads. if you have access to the individual cells then you can use a hydrometer and check the charge state per cell and if you have a difficult cell then you can deal with it. for simplicity and faster recovery after a power failure, I use 4 Noco Genius 12v smart chargers. I have a 48v bank made up of 24 2v 500Ah cells. When you charge the next battery up, you would actually be shorting battery 1 + directly to battery 1 - by way of earth ground. When you charge the bottom battery, no problem. Does your charger ground the battery negative terminal to earth ground? Does it have an isolation voltage rating? Does your 48V bank, or the inverter connect 48V ground to earth? Just to be explicit, imagine this. Second, there could be some kind of grounding issue. If you remove the load while charging, this would not be much of a problem, I guess, but charging them in series would still be better in terms of keeping them synced up. If you charge them one at a time, while there is a load on the bank, they may become out of sync, some charged, some less charged. First, you want the batteries to have the same charge since they are in series. I can think of two potential problems with charging the batteries in circuit. The common solution, unfortunately, is to use a 48V charger.
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