diy solar

diy solar

4 lead impedance meter

I have one and a couple of YR1030. I prefer the YR1030 that requires zeroing every time you power it on. My YR1035 zero drifts and requires periodic re-zeroing at random intervals rendering that function pretty worthless.

Consistency between meters is mediocre, but a single meter is consistent and repeatable.

Good for somewhat accurate absolute measurements. Great for comparative measurements between cells.

Those are also on eBay all day long.

Don't be afraid of the search. Several entries pop up.
 
I bought the 1035+, mostly because that seller had an estimated delivery time in a month, while the others said “refund if not delivered by 2/14”.
 
Just zero it very regularly, like every time you turn it on and take a series of readings. I simply use any available copper to zero the unit. The actual resistance value can't be counted on to be absolutely correct, but it will be reasonably accurate, and the comparison of those readings between cells will help you identify outliers and problem cells.
 
I have the same model yr1035. It works excellent, anyone who build battery packs especially the 18650 need one of these IR tester. I also tested on my 16ah oddesey agm, and the IR result I got was as per specs for that battery. I already found many cells with high IR that I would normally use in a battery pack. Some packs I build previosly before I got the tester, that had balance issues, when I took apart I can always find 1 or 2 cells with high IR.
Every cell I get I always test with the IR tester before I even waste time doing capacity checks. This tester weeds out the weak cells. High IR usually equals lower capacity and possible balance problems.
I had my tester over 6 months and tested hundreds of cells, and still haven't to charge it once. Highly recommend to everyone.
 
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