Recently doing something with cables and the stuff I accidentally connected plus and minus cables and burned one of fuses. I would not be a big deal I had noticed that immediately. As I had not, system started to work with only one of three batteries, the smallest one, 12 Ah. The result was that having light in the kitchen on I had 10 V on the installation. The next morning with the sky full of clouds ( so poor charging) my green diode was shining very bright light ( few hours later it was 10 V).

I started to looking for the reason and and found the blown fuse.  After replacement system works normally.

It was quite good experience to see the performance of system with drastically oversized PV cells comparing to battery capacity. Charging / discharging goes very quickly, system is not stable enough. As I found recommendations, batteries capacity should be twice as much as PV capacity e.g. 60 W PV, 120 Ah. I have bit less, till summer time it is fine, then some amount o energy I can not accumulate anymore.



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    About me

    Hi, I am Michal. My idea was to start my own small scale PV system in my flat. I live in Poland, Warsaw district.


    February 2015
    December 2014


    Renewable Energy