Changes between Version 4 and Version 5 of AutonomousSolarSystem


Ignore:
Timestamp:
Apr 19, 2011, 7:03:12 AM (14 years ago)
Author:
Rick van der Zwet
Comment:

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  • AutonomousSolarSystem

    v4 v5  
    22Power a 12V/2A (24W) system for 24h/24h, using an autonomous solar system in the Netherlands (read: not very sunny).
    33
    4 Calculations:
    5 {{{
    6 24W * 24h =~  0.6kW
    7  2A * 24h =  48.0Ah
    8 }}}
     4= Initial thought =
     5{{{ 24W * 24h =~  0.6kW and 2A * 24h =  48.0Ah }}}, so given ourself a {{{100 Ah}}} battery (AGM, deep-cycle), should last us to roughly 2 days of operation.
     6
     7After first measurements my 20W Solar panel is preforming {{{50%}}}} less if I put it a bit into the shadow (balcony fences). Putting it into fully into the sun makes it generate roughly 1.2A/12V which is indeed [http://humietrading.nl/index.php?option=com_content&task=blogsection&id=5&Itemid=34 as advertised]. The input should run at {{{17.5V}}} to make it take the full {{{20W}}}.
     8
     9The change controller [http://www.stecasolar.com/index.php?Steca_Solsum_F_en Steca Solsum 6.6F] seems to regulate the input to {{{12V}}}, leaving me wondering if the panel will be fully utilized. Cause {{{20W/14W * 100% = 70%}}} e.g. loosing {{{30%}}} efficiency seems a bit to much.
     10
    911
    1012= Idea/Brainstorm =
    1113* Use [http://www.geo-dome.co.uk/article.asp?uname=solar_mirror mirrors] to increase efficiency.
     14* Measure DC current with an [http://openenergymonitor.org/emon/node/31 LT1495 and Arduino].
    1215
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