Announcement

Collapse
No announcement yet.

Solar sizing advice.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Solar sizing advice.

    lets assume the follwoing: Peak sun hours in Toronto, Ontario ( My approx location)
    Location:Toronto, ON |Summer Avg. 3.98 | Winter Avg. 2.13 | Year Avg. 3.44

    Requirements- Maximum 2000wh/day
    Battery Bank Based on 2 dayspower, with no sun.
    2000wh/day x 1.5 (efficiency loss) =3000 wh/day
    3000wh x 2 (days without sun) =6000wh
    6000wh x 2 (Battery bank can only be depleted 50%) =12,000wh
    12,000wh with 6 volt 428ah batteries-
    12,000wh / 6 (volts) =2000ah
    2000/ 428 (Ah of surrette s550 @20hr) =4.67 (# of batteries required)...round up to 6 batteries

    SOLAR PANELS @ 2.13 sun hrs/day (winter hours)
    2.13 x 250 watt panels =532.5 (Round down to 500watt/panel/day)
    2000wh / 500 =4 (250 watt solar panels)

    Does this all add up?

    I have yet to figure out how to size a charge contorller, any suggestions would be helpful.

    Thanks!

  • #2
    Originally posted by culnan View Post

    I have yet to figure out how to size a charge contorller, any suggestions would be helpful.

    Thanks!
    If you are using an MPPT CC (advisable for your size system), then the calculation is simple:

    Take the total panel power (1000W in your example) and divide by your battery bank voltage (you did not give that, but let us assume 12V (really to low a design value for your size bank, but....)). That gives you the approximate amp rating of the CC.
    1000/12 = 83.3. So, going down to allow for panels producing less than full power and the CC be less than 100% efficient you would have an 80A CC. Or two 40A CCs each connected to 1/2 of your panels.
    SunnyBoy 3000 US, 18 BP Solar 175B panels.

    Comment

    Working...
    X