Status: Sheltering in place, we have plenty of food and supplies.
Plans: Mail my ballet today. (Last day)
- 07:00 Up late, 4 eggs and coffee.
- 08:00 Getting organized and writing in my Blog.
- 08:30 Working on my ballet.
- 11:00 Mailed my ballet, wiring my new batteries. Storms outside the homestead.
- 12:00 NAP
- 15:00 Delivered a loaf of bread
- 16:00 Working on the new battery bank
- 19:00 Helping the wife
Narrative: Bought new bank of batteries for the 2nd 48V UPS.
It is difficult to get four perfectly matched batteries, so I bought a battery equalizer. It sequentially connects a large capacitor across each battery to equalize the voltages. There are wires that will be across all four batteries that needs to have fuses put on them. These batteries can supply a hundred amps or more and the equalizer is maybe 22AWG wire.
Added two intra battery 30V ASO fuses to protect the end batteries from shorts and a $20 high voltage half bank fuse to protect the bank. 25Amps at 55V is 1,300W, a lot of power!
The UPS has internal batteries that would provide sufficient current to blow the fuses if I just connected this bank to the UPS without equalizing the voltages. To equalize the two battery banks I used a long 18AWG wire to reduce the current between them. Once they have equalized I removed the thin 18AWG wire and installed a much shorter/thicker 12AWG wire to power the UPS. The high voltage ceramic fuse is 15 amps at the center of the bank. The low voltage fuses are 25A are only between the end batteries.
Feelings:
Tomorrow:
Injuries: Arguments: Exercise: Feeling words: Travel: Noteworthy: Accmplishments: Purchases: Project: Theme: Engineering: Repairs: Pi News:
From the book “Triggers” by Marshall Goldsmith
Did I DMBT make my wife feel loved? Yes
Did I DMBT help my wife today? Yes
Did I DMBT be happy? Yes
*Did My Best To