Grape Solar 40A PWM controller

Same as my controller. The charging cutoff voltage should be no more that 15V. Boost is fine, but be aware that the controller will bump into boost mode everyday as soon as the sun is high enough to provide that voltage. You won't get the same boost amps off the solar panels as you would off shore power or the genny, so the panels will really only maintain a top off charge.

Unless you're running the DC loads through the controller, the low voltage cutoffs and over discharge settings don't matter.