I just dropped the price of
the permaculture playing cards
for a wee bit.

 

 

uses include:
- infecting brains with permaculture
- convincing folks that you are not crazy
- gift giving obligations
- stocking stuffer
- gambling distraction
- an hour or two of reading
- find the needle
- find the 26 hidden names

clickity-click-click

  • Post Reply Bookmark Topic Watch Topic
  • New Topic

Need help with batterybank  RSS feed

 
daniel lauritsen
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Im trying to find out how long a 916 Ah 48V battery bank can drift something that requires 47 kwh/ day. at 230V ?
Can anyone here tell me how to figure it out, or if it's even possible.
Thanks
 
Steve Edwards
Posts: 5
Location: Bristol - UK
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Daniel,

Not sure what you mean by "can drift something" but if you mean "drive" or "power" then here's my guestimate at it - but I'm new to these kind of calculations so you might want to get these checked out by someone with more experience with battery banks...

47kWh/day is 1958.333Watts continuous. At 240v that's 8.160Amps continuous load. Assuming an inverter efficiency of 80% that's about a 10.2Amp draw on the batteries. So a 916Ah bank should last for around 90 hours without recharge.

Corrections to the above welcome - I want to learn how you folks calculate this!
 
Bill Bradbury
pollinator
Posts: 684
Location: Richmond, Utah
32
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
That's close, but you forgot to convert the voltage so;
10.2A*240/48=51A@48V then 916/51*.9(line losses estimate)=16.16hrs, but probably less due to voltage drift as the batteries come down, so my non-expert opinion would be around 12 hrs.
 
Steve Edwards
Posts: 5
Location: Bristol - UK
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Yeah, thanks Bill, I did forget to convert between voltages.
 
BWA HA HA HA HA HA HA! Tiny ad:
one giant gob of podcasts, videos and stuff
https://permies.com/wiki/37733/digital-market/digital-market/giant-gob-podcasts-videos-stuff
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!