Yes, we have been in Alpha testing for while now, and as always, under a non-disclosure agreement. We are still working on FLA testing (new batteries right now) so no comments there just yet. This can take a while as flooded lead batteries really suck to test. We are currently on the second
brand new flooded battery and as of yet we still can't get one to deliver on rated capacity.
We still can't actually disclose all that much about the SG-200. What has been most impressive, for me anyway, is the near pin point accuracy for LiFePO4. It honed in on the battery remarkable fast and did so within 4 cycles. Cycling LiFePO4 up and down it has honed in to within 1% - 2% on the accurate SOH of the battery as well as predicting SOC to within a +/- 1% - 2% accuracy.
I spent months and months testing existing Ah counters against LiFePO4 to get them to track well and they all failed rather grossly. I currently use a Link-Pro, on my own boat, but it really, really stinks at tracking LiFePO4 no matter what you do to it, programming wise. Tried the Victron too, same thing...
As of right now the Link-Pro requires a known-full recharge & reset about every 6-8 cycles, if you really want good accuracy, or every 10-20 to keep it close enough. This is just ridiculous because unlike lead, LFP never needs to get to 100% SOC. One of the production model SG-200's will be going on my own boat as soon as I can get my hands on one.
Keep in mind that the early adopter program is just that, you are in a beta testing category. I suspect this could even require shipments back for flashing revised software etc..
The SG-200 is not a typical Ah counter. In fact it won't tell you -Ah's discharged, and for good reason, Coulomb counting simply does not work very well for determining SOC. It does however give you an SOH calculation which leaves typical Ah counters in the rear view mirror..
Volts
Amps
SOH - State of Health
SOC - State of Charge
Time to Go at Current Load
The SOH feature is what puts the SG-200 in a field of its own. I suspect it is likely going to create some angry boat owners, when they realize how short their battery life really is, as well as possible back-peddling by battery makers.
The LiFePO4 packs I've tested the
SG-200 against were all within 1% - 2% accuracy for state of health (usually closer to the 1% end)!
For example a 100Ah pack that had been over absorbed and floated, things you just don't do with LiFePO4, was tested at an 87.7% actual SOH after about 200 (abused) cycles by the owner.
Upon connecting the 87.7% SOH LiFePO4 pack to the
SG-200 it immediately calculated for 92% SOH, not too bad! This is within a 5% accuracy simply upon connection...
Cycle #2 it calculated 90% SOH
Cycle #3 it calculated 89% SOH
Cycle #4 it calculated 88% SOH and remained within 1% SOH accuracy through the remainder of testing
Cycle #3 LiFePO4 = Actual SOH 87.7% - SG-200 SOH 89%