I don't have the MPPT250, but I had a MPPT200 until it quit working one day after about eighteen months of use. I wrote BZproducts and they wanted $10 for return shipping on a warranty item. This thing is about the size of a pack of cigarettes and would have cost $4 prioity mail to ship back to me.

So I decided to buy a C35 instead. Whoopee! Three stage charging. I had the BZ controller on a small system with four golf cart batteries and very occasional loads. About four months after I installed it, I went and looked at my batteries and I could see the tops of the plates! So I added water. Four months later, all the water is boiled out again. 12V batteries do not like a 14.4V float charge all day long every day.

These batteries literaly drank water until I figured out what was going on. Either give up absorbtion and ignore sulfation, or boil the crap out of them all day long. There is only one voltage to choosre from.

I've still got this busted BZ controller and an altenergystore reciept from 2004. I'll sell em both for five bucks if you want to deal with BZ on the warranty.

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