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Home / Charge Controllers / Solar Charge Controllers / MPPT Solar Charge Controllers / BZ Products Charge Controllers (MPPT) / BZ MPPT250 25A,12V Charge Controller w/LVD / Reviews / STAY AWAY IF YOU WANT TO SLEEP
Larry George

BZ MPPT250 25A,12V Charge Controller w/LVD

Written August 08, 2006

STAY AWAY IF YOU WANT TO SLEEP

What looked like the best controller in my comparison of a dozen controllers turned out to be a mistake. At 5:30am the controller woke me up with a relay click every few seconds. This continued for quite a while as the sun came up. It was so annoying I had to unplug it.
Contacting their tech support was useless. After days and days of back and forth trying to find a solution, their final response was “that is normal operation”. It is clear what looked good on paper was horrible in actual use. I suspect no one at their company has every camped with one of these units. Otherwise they would have been screaming at the design staff the next day.
Having the MPPT feature is nice, but it is still a 1-stage single voltage charge algorithm. There is no absorption phase and no float option or setting. So your batteries will never be fully charged unless you set the charge voltage high enough to cause excess water loss all the time. Either way your batteries suffer.
Spend a few more dollars and get a good 3-stage charge controller even if it does not have the MPPT feature. Your batteries will thank you, and your sleep with thank you.
I would have rated it a zero if that was an option. Giving it the bottom rating of 1 seems too high.

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