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Posts: 865
| Funny You should ask, But Yes I was the Service Manager for General Research Laboratories here for almost 25 years. This Company was one of the main sources in supplying Batteries and Chargers to almost 85% of the lighting companies, TV News Crews, and Cinema companies in the United States. We built batteries and chargers upon request to Power anything out there Our largest being Batteries and chargers for our US Submarine Naval Bases. I mainly dealt with the Servicing of these Batteries and Chargers. It was critical to get maximum performance out of these batteries so many of these units were built to be discharged in Parallel, But charged in Series.. I have Yet to see two Batteries that are Discharged in Parallel get 3 times the Batteries Rated Ampere rating....... If one battery is rated at 100 amp Hr. then it will run approx. 1 hr. with a 100 amp load, or two hours with a 50 amp load..... If two batteries are put In parallel you will get approx. 2 hrs. with a 100 amp load and four hrs. with a 50 amp load.....There is a plus/minus of 7% to 9% due to Full true battery charge saturation.... But to get Triple 300 Amps out of two batteries that are rated 100 Amps each. WILL JUST NEVER HAPPEN. Believe me, I do understand you read this somewhere and you are repeating what you have read . But this is just not the Case, and never will be.. Here is another thing that many are not aware of..... Batteries that are in Parallel should ONLY be charged in series... Battery damage or Battery reversal Voltage can occur more often when not charged correctly. reason being the battery charger is basically a voltage sensor, so when in Parallel you will actually have the two Positives connected and the two Negatives connected so by putting on your charger you are Now only sensing the highest voltage of the two batteries. When the shutoff voltage is reached it will shut off. Now if one battery is older or not as strong as the other it will not fully charge, so the Higher voltage battery will be fully charged and the other will not. When discharged over and over again the weak battery may be down to 8 to 10 volts under a maximum load causing cell failure where it may never recover. That being said if your charger goes from a high charge state and then once charged goes to trickle charge state, that is Great.....Then you just have to be sure it is left on long enough to bring the weaker battery( if any) up to a full charge.... Fishing, and coming home fast charging and going out again is not the best for the batteries....But we all do it and probably have been for years... Thanks Mike | |
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