Instapark® SML-05 PWM 5 Amp Solar Power Charge Controller, 75 Watt at 12V / 150 Watt at 24V
Product seems to work well.  It came with two manuals: one very small printed book, and one laser-printed and stapled stack of paper.  Hook-up is completely straight-forward, but the large manual omits how to set the jumpers to configure the charging parameters.  It's described in the small book, but a picture would have been valuable.