Thursday, Feb 13, 2020 at 14:02
Rambler
I see there is no current spec, so unless you know the short circuit current by testing and use a lesser figure of around 1 amp less and can hold by regulation to 18v max power voltage and multiply those two figures together, ie, amps and MPP voltage you won't have much idea of the output.
Many panels of Chinese origin DO NOT show current figures 'cos they don't want you to be able to work out what is going on. Most panels produce voltage easily, it is the associated current in the equation which matters to be able to work out suitability. On the
panel size alone and 18% efficiency, working under ideal conditions indicates around 200w if you are lucky. To be realistic, cut 25% off that and you will be nearer the actual output. As Boobook mentioned, an MPPT
solar regulator is the only way you will be able to take advantage of the current and voltage for a maximum harvest with any
panel. because they operate to create the optimum operating voltage and current of the
panel at any one time, and convert that to battery charge current. The
solar input and the output to battery are completely isolated, unlike a PWM charge regulator which is less efficient. That
panel seems to be quite a bit less than you will need to run two fridges, one of which, I presume will used as a freezer.
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