Mac: Thanks for the advice. We will install the shunt today. A few more questions:
1. Will the Outback 50ma shunt be compatible. My research indicates the value is correct. 2. DC clamps are notoriously inaccurate, particularly at low amperages. Will this be a problem, or is shorting the leads adequate? Thanks again. William Miller PS: We looked at the Midnite cabinets but they put the OPCD too far from the batteries. William > On Feb 12, 2015, at 4:45 AM, Mac Lewis <[email protected]> wrote: > > Hi William, > > I want to talk directly to your problem at hand. I think installing the > shunt and properly calibrating it, will fix this system . In a DC coupled > system with a Sunny Island, it is imperative that you use a shunt, unless you > are using the Midnite charge controllers with the communications to > accurately report all charging (or the non-UL listed SMA charge controllers). > There are so many functions and calculations that the Sunny Island performs > that needs accurate SOC calculations. All of the shutdowns that you are > seeing are resulting from faulty SOC measurements. I wouldn't believe the > reported state of health either, because it is using the faulty SOC > measurements. Don't believe state of health until you have a couple of > months of operation with the shunt. > > Right now, with the system as is, it isn't accounting for the charge coming > from the charge controller(s). It is shutting down because its only > accounting for AC power processed through the Sunny Island. I once had a > Sunny Island system with an improperly calibrated shunt and it acted just as > you describe, strange shutdowns, bad SOC output etc. After I got it > calibrated, it has worked flawlessly. > > Take your time when you are calibrating the shunt. Follow the (odd) > directions perfectly and it should work. Verify Sunny Island readings match > your DC clamp meter and you should be good. > > >
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