The Naked Scientists

The Naked Scientists Forum

Author Topic: Solar panel and battery stuff (off grid doubts)  (Read 206 times)

Offline Alex Siqueira

  • Sr. Member
  • ****
  • Posts: 157
  • Thanked: 4 times
    • View Profile
Solar panel and battery stuff (off grid doubts)
« on: 01/10/2016 00:35:26 »
I have:
1 plasma tv 50° – max consumption 275w
1 pc gamer(without monitor) consumption between 30w-500w-load
2 led light bulbs (low wattage)

Now, I bought myself a battery 12v 400a (stationary-deep cycle)
also, 1x 315w 24v canadian solar panel

I’ll run all this on a pure sine wave inverter 1000w(nominal),
I intend to keep the bank 12v(even if paralel), and the controler a 60a mppt (for upgrade)…

also I intend to run this system almost every single night for about 6 hours, and 1 hour during the morning, it remains the whole day completly turned off…

Now down here in south Brazil, I can achieve I believe 5 to 6 hours of sun peak per day, also since I’m a glazier its very simple to me to set the painel with some sort of chain, so I can control the inclination, to maximize the performance of it, wherever, to the point…
How many batteries will I need to be able to run this system each night for the periods decribleds above, and how much 315w panels to be able to charge those very batteries, being ready for each night? Do I need more than 1 battery and one 315w solar?

 For the record, the TV is by definition 220v - 1,25a - max 275w
 The pc setup I'm not sure about amps, but the wattage is 30w-110w idle/ 500w load

 Since my battery bank, is and will remain 12v, my tv DCamp is 16.5a / the wattage on Eco function is bellow 175w...
   The PC, considering that is variable lets presume that the DCamp of it would be about 10a, the wattage would 80% of the time being 110w...
 Also considering that I can but I wont drawn my battery to bellow 40% never, witch let me with only 260a at best, my sun hours would be trully around 10hrs cause I'm from Brazil, I mentioned 5 horus only to be more realistic with the math...
 Since I do not require more than 90centimeters of solar cables from the panels to the charger controller, I thinking about go pwm, but this is another doubt of my own, if in my case an mppt would really compensate from the price...


 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8134
  • Thanked: 53 times
    • View Profile
Re: Solar panel and battery stuff (off grid doubts)
« Reply #1 on: 01/10/2016 03:53:07 »
The process of charging & discharging a battery both involve has conversion-losses : about 20% will be lost each time.
« Last Edit: 01/10/2016 04:06:47 by RD »
 

Offline Alex Siqueira

  • Sr. Member
  • ****
  • Posts: 157
  • Thanked: 4 times
    • View Profile
Re: Solar panel and battery stuff (off grid doubts)
« Reply #2 on: 01/10/2016 10:54:30 »
alright thank you, but the question remain, including all the aspects, how many 400a batteries and how many 315w 24v panels would I require for a 24 horus period? considering that the batteries are meant to be distarged by half (50%)...
« Last Edit: 05/10/2016 15:51:27 by Alex Siqueira »
 

The Naked Scientists Forum

Re: Solar panel and battery stuff (off grid doubts)
« Reply #2 on: 01/10/2016 10:54:30 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums
 
Login
Login with username, password and session length