Guys,
I have read through all the threads on here and can not find a definitive answer before i proceed.
I have a number of APC UPS that support extended Runtime modules - they are 48v internal and 48v external.
I am sick and tired of replacing SLAs every couple of years so thought that Lithium would be a better bet.
I have read through here in relation to changing the relevant voltage levels to better match the profile of the Lithium batteries.
My plan was to run a 200a Seplos BMS through to the 16s 50ah battery pack - using the Seplos to control the correct charging and balancing of the pack - essentially using the UPS battery cable as a DC source to the Seplos.
I see two issues with this and want to confirm others thoughts
1) Once the batteries are topped off - i assume the Seplos will disconnect them - how quickly will it reconnect if power fails and the batteries have to step up and start supplying power ?
2) If i want to cycle the batteries each day i could put a mains disconnect switch (Sonoff PowR3 for instance) on the input to the UPS, have it turn off the mains to the UPS for a couple of hours (say during peak time to get some extra benefit) and then back on again - thus forcing the UPS to go into charging mode and exercising the batteries.
Does this sounds like it would work ?
My biggest concern is 1) above - will the BMS kick in quickly enough on a call for power ?
Craig
I have read through all the threads on here and can not find a definitive answer before i proceed.
I have a number of APC UPS that support extended Runtime modules - they are 48v internal and 48v external.
I am sick and tired of replacing SLAs every couple of years so thought that Lithium would be a better bet.
I have read through here in relation to changing the relevant voltage levels to better match the profile of the Lithium batteries.
My plan was to run a 200a Seplos BMS through to the 16s 50ah battery pack - using the Seplos to control the correct charging and balancing of the pack - essentially using the UPS battery cable as a DC source to the Seplos.
I see two issues with this and want to confirm others thoughts
1) Once the batteries are topped off - i assume the Seplos will disconnect them - how quickly will it reconnect if power fails and the batteries have to step up and start supplying power ?
2) If i want to cycle the batteries each day i could put a mains disconnect switch (Sonoff PowR3 for instance) on the input to the UPS, have it turn off the mains to the UPS for a couple of hours (say during peak time to get some extra benefit) and then back on again - thus forcing the UPS to go into charging mode and exercising the batteries.
Does this sounds like it would work ?
My biggest concern is 1) above - will the BMS kick in quickly enough on a call for power ?
Craig