| Nathan, I use BZ Products' MPPT250 and MPPT500 on portable PV power systems that get used (and abused) for providing power at various environmental and other events throughout the year. Been using them for about 6 years, and still have them in service. (One MPPT250, four MPPT500.) The MPPT250 had a digital display fail early on. BZ Products was *very* prompt about sending a replacement MPPT (under warranty). Aside from that, no issues. I might add that these units get some [unintentional] rough treatment at times. Dan --- On Wed, 4/10/13, Nathan Stumpff <[email protected]> wrote:
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