rsaeon
Guide
There's something here that's not making sense.
The two internal modules would be two 8S packs of 12V batteries connected in series, so 192V total.
The external pack is four of these 8S modules connected in a 2+2 arrangement, for a total of 192V again but at twice the Ah.
From a technical perspective, it shouldn't have any effect on the internal charger if a larger capacity battery is connected, it'll just charge slowly and runtime calculations would be incorrect.
A battery cannot demand or pull more power than what is available from the charger, it cannot load it down or stress it out. It'll just take however much is available.
However, it may shorten the lifespan of the battery, not the charger, if a smaller capacity battery is connected to a charger that is configured for a larger capacity battery.
The only way a charger can fail with a higher capacity battery is if there's not enough cooling to keep it running for extended periods of time, but APC would have accounted for that in the design.
A charger may fail beyond repair if the output is shorted, but with lead acid batteries, the opposite happens as they age — they just refuse to take the charge.
In my talks with Vertiv, they say an external battery charger has no effect on the UPS itself, provided it charges at the same voltage as the UPS. In fact, they sell chargers for extended batteries seperately and there's no communications on those things, they're just connected directly to the external battery pack. Some of the UPS they sell can be used with batteries in the hundreds of Ah.
In this case, the fault is more likely to be a component failure due to either poor circulation, debris, or just age — anything with a capacitor will eventually die, and all solder joints will eventually crack.
The two internal modules would be two 8S packs of 12V batteries connected in series, so 192V total.
The external pack is four of these 8S modules connected in a 2+2 arrangement, for a total of 192V again but at twice the Ah.
From a technical perspective, it shouldn't have any effect on the internal charger if a larger capacity battery is connected, it'll just charge slowly and runtime calculations would be incorrect.
A battery cannot demand or pull more power than what is available from the charger, it cannot load it down or stress it out. It'll just take however much is available.
However, it may shorten the lifespan of the battery, not the charger, if a smaller capacity battery is connected to a charger that is configured for a larger capacity battery.
The only way a charger can fail with a higher capacity battery is if there's not enough cooling to keep it running for extended periods of time, but APC would have accounted for that in the design.
A charger may fail beyond repair if the output is shorted, but with lead acid batteries, the opposite happens as they age — they just refuse to take the charge.
In my talks with Vertiv, they say an external battery charger has no effect on the UPS itself, provided it charges at the same voltage as the UPS. In fact, they sell chargers for extended batteries seperately and there's no communications on those things, they're just connected directly to the external battery pack. Some of the UPS they sell can be used with batteries in the hundreds of Ah.
In this case, the fault is more likely to be a component failure due to either poor circulation, debris, or just age — anything with a capacitor will eventually die, and all solder joints will eventually crack.
