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MrWizard's avatar
MrWizard
Moderator
Jun 24, 2015

why don't Solar controller mfg/sellers use honest ratings

example most 30amp controllers are listed at 390w of panels and 40amp controllers at 500w of panels but we don't charge batteries at 12.0v we charge at 14v or higher 14v*30 amps 420w output, ...
MrWizard's avatar
MrWizard
Moderator
Jun 27, 2015
I don't think of voltage as being a problem with controllers
In most cases your panels in series is easily under the limit or you know it's over, especially with PWM where parallel is the norm, because you want amps not volts
With MPPT you do need to check that your series arrangement is under the controller limit

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