I don't understand why someone would write a review about a BZ MPPT 250 that he does not have and complain about the problems he had with an older BZ model 200. Specifically, he felt 14.4 volts was too high for a float charge. I agree. So does BZ. The manual for the model 250 clearly states:

"The float voltage of the MPPT250 is factory set to 14.1 volts. The float voltage is adjustable."

As for it not being a 3-stage controller. The truth is that 3-stage charging only really applies to PWM controllers although many MPPT manufactures like to say they are 3-stage as well because it sounds good and people expect to see the words "3-stage charging" in the specs. But the whole concept behind MPPT eliminates the first stage of "3-stage" charging. In 3-stage charging, Stage 1 is "bulk charge" done at a non-varying pre-set high voltage until the battery nears full charge, at which point Stage 2 "absorption" begins and varies the charge level to match what's happening in the battery as it finishes charging. But MPPT charging -- particularly when using a temperature probe like the BZ model 250 does -- eliminates the sledge hammer approach of the Stage 1 "bulk charge" and is *always* in Stage 2, always optimizing and varying the charge to the battery based on its current state and temperature and matching that to the varying output of the solar panels. So, by the nature of MPPT, it is a 2-stage controller: using optimized, variable charging until the battery is full, then maintaining the full charge at user-specified float level.

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