My experience has bee that all SOC meters can drift off over time. Best
I can figure is that they don't reset at full, or do reset when the
battery is not fully charged. This coupled with an inability to account
for temperature variation and differences in discharge rates, can also
contribute to inaccuracy. Thus, my solution has been to not depend on
auto starting the generator. The smartest control is the user
themselves, who can look at the weather, look at their usage, time of
day, SG of the batteries, voltage, etc. and better decide when to start
the generator. Their batteries and generator last longer, and they spend
$1000s less in propane over the life of the system.
For folks that insist on auto start, they better get ready for big fuel
bills, generator replacement, and an overall less reliable system, since
their is not human management of the system. A seasoned off grid
customer is always smarter than any auto start system. That being said,
the advent of batteries with their own BMS systems that can communicate
with the rest of the system may make auto start a more viable and less
costly option in the future
Ray Walters
Remote Solar
303 505-8760
On 8/18/18 7:24 AM, Tump wrote:
Yep its is terrible! Spoke w/ a former member of their (OB)’s tech
support and was told that the counting of amp hours both up & down
drifts so you have to recalibrate monthly.
This IS something OB is aware of and has no interest in addressing.
Thoughts…. remove and when you find a device that I am able to install
and get accurate info on multiple shunts to trigger gen start let me
know.T
On Aug 17, 2018, at 3:09 PM, Lou Russo <l...@spreesolarsystems.com
<mailto:l...@spreesolarsystems.com>> wrote:
Hello All,
Does anybody have any insight in getting the SOC to report accurately
on the Outback FNDC when using batteries that have a minimal voltage
curve? I have several systems with LFP batteries that have both a
eGauge (communicating directly with the battery BMU) and a FNDC and I
get wildly different SOCs. In a typical 24 hour period (12am-12am) I
get SOCs on the FNDC that vary 2% to 34% of what the battery BMUs are
reporting. I am assuming that the BMUs are reporting accurately. I
would think a 1%-5% difference would be acceptable.
Any help or thoughts on this subject would be greatly appreciated.
Aloha,
Lou Russo
l...@spreesolarsystems.com <mailto:l...@spreesolarsystems.com>
808 345 6762
Spree Solar Systems LLC
CT-34322
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