| Version 5 (modified by , 14 years ago) ( diff ) |
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Target
Power a 12V/2A (24W) system for 24h/24h, using an autonomous solar system in the Netherlands (read: not very sunny).
Initial thought
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.
After 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 as advertised. The input should run at 17.5V to make it take the full 20W.
The change controller 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.
Idea/Brainstorm
- Use mirrors to increase efficiency.
- Measure DC current with an LT1495 and Arduino.
