Smart Battery __LINK__
Mufid Bonnet
Pilots and drivers enjoy the Smart advantages when using the Spektrum Smart LiPo batteries to power their RC aircraft and surface vehicles. You'll never have to set your own charging preferences for a Spektrum Smart battery until you want to. When a Smart LiPo battery is connected to a Spektrum Smart charger, its unique charging parameters and health information upload to the charger from the battery's integrated memory microchip. Through the charger you can view and, if desired, set preferences such as charge rates, so all that's required to charge the pack is connecting it to your Smart charger. G1 and G2 Smart batteries are available in 30C, 50C, 100C and 120C discharge rates for high performance and longevity.
A smart battery or a smart battery pack is a rechargeable battery pack with a built-in battery management system (BMS), usually designed for use in a portable computer such as a laptop. In addition to the usual positive and negative terminals, a smart battery has two or more terminals to connect to the BMS; typically the negative terminal is also used as BMS "ground". BMS interface examples are: SMBus, PMBus, EIA-232, EIA-485,[1] and Local Interconnect Network.
Internally, a smart battery can measure voltage and current, and deduce charge level and SoH (State of Health) parameters, indicating the state of the cells. Externally, a smart battery can communicate with a smart battery charger and a "smart energy user" via the bus interface. A smart battery can demand that the charging stop, request charging, or demand that the smart energy user stop using power from this battery. There are standard specifications for smart batteries: Smart Battery System,[1] MIPI BIF and many ad-hoc specifications.
A smart battery charger is mainly a switch mode power supply (also known as high frequency charger) that has the ability to communicate with a smart battery pack's battery management system (BMS) in order to control and monitor the charging process.[2] This communication may be by a standard bus such as CAN bus in automobiles or System Management Bus (SMBus) in computers. The charge process is controlled by the BMS and not by the charger, thus increasing security in the system. Not all chargers have this type of communication, which is commonly used for lithium batteries.
Besides the usual plus (positive) and minus (negative) terminals, a smart battery charger also has multiple terminals to connect to the smart battery pack's BMS. The Smart Battery System standard is commonly used to define this connection, which includes the data bus and the communications protocol between the charger and battery. There are other ad-hoc specifications also used.
I have been using Smart battery sense a little over a month together with a MPPT 100/20, Smartshunt 500 and Cerbo GX. Smart Battery sense is located on top of my 100Ah Lifepo4 battery and transmits the battery temperature to the MPPT unit which is 2 meters away from the battery compartment.
Everything was working in harmony until yesterday. The weather was perfect and sunny but the MPPT wasn't charging my battery. After spending some time, I realized that the SBS was reporting a temperature of -18*C. Of course, MPPT was not sending any amperes to the battery in order to protect it. However, -18*C couldn't be true as I had access to another temp device in the trailer which was reporting +23*C. I was checking this remotely via VRM.
Good to hear you were able to locate and fix the problem. Obviously this is unexpected behavior so please let me know if this happens again. Please also check the VE.Smart Networking status of the SmartShunt next time: does it report to be transmitting battery temperature? And if so, is the temperature then also shown in the main status page of the SmartShunt?
PS2 I decided to make use of this incident to test my new parallel battery bank which comprises of 2x 100Ah Lifepo4 batteries. I have disabled the MPPT to see the discharge performance... it wil take another 4 days, at least :)
Just dropping by to mention that this just happened to me too. Both Smartshunt MPPT 100/30 and MPPT 100/15 registered -18 degrees battery temperature and no charging happened. I have no temp sensor. I also have a Smartshunt 500A, a 12V/200A Lifepo4 battery and a Raspberry pi with VenusOS v2.93.
Tattu Plus Leading UAV Smart Lithium Battery Trend! Owing to the development of Drone market, drone user need the battery more smart during their work, that is why our Tattu plus comes out .Tattu Plus is the upgraded version of Tattu battery!
Tattu Plus, a smart battery specially designed for UAV. Protective casing give these batteries extra safety during the flight. Power lead is also longer then normal tattu batteries. Indication LED lights of the batteries can let you know how full of the capacity the batteries have when charging. Warning lights to give you indications of the temperature, over/under the charge and cells balance healthy level. These lipo batteries will also go into an intelligent storage mode when you fully charge the batteries and decided to store away. The batteries itself will discharge in the storage mode to keep the voltage at a certain level for storage.
The amazing battery management system(BMS) will smartly manage your battery and extend your battery life. This BMS is a trend of Lipo batteries, it's the new generation of UAV batteries. Tattu Plus smart battery suit for 6S and 12S power system and support SMBUS/UAVCAN protocol.
Sorry, I read your question incorrectly; I understand your issue now. As you stated, you can't connect to the smart sense while having the MPPT hooked up to the Pi. What I would suggest since you don't have a smart MPPT with built in bluetooth is just purchase the temp sensor for your BMV and remove the Smart Battery Sense all together. Since both the BMV and MPPT are hooked up to your Pi, they can communicate with each other once you enable DVCC and enable shared Temp Sense and shared voltage sense. It will accomplish the same thing (to get the temp of your battery to your MPPT). After that is done, you can configure the MPPT to have a low temp cut off.
@nebulight - Sorry for delay and thanks for the response.
I have asked another question and tagged you in it
I will at some stage just get the wired non bluetooth battery monitor but as my batteries are NOT litium the temperature parameters are not as important as they would be in a Lithium system
I am not sure what you mean by enable DVCC ??
Thanks
Robert
I am using the SBS and a 712 without temp probe as I wanted to monitor my chassis battery. It appears to be working correctly after I disabled the ve Networking on the 712. When I had the 712 connected to the ve network with the mppt's and sbs it didn't appear to be using the SBS temp/voltage data.
You will need a BMV-712 or SmartShunt Battery Monitor together with a temperature sensor attached to your battery and a GX device (CCGX, Venus GX or Cerbo GX). The battery monitor connects to the GX device and the GX device then is reporting to VRM.
I do not understand, why another sensor should be necessary. The Smart battery sensor connects perfectly to the Vicron Connect on IOS and I see al data. Now I want see the data on the Venus OS on the Raspberry. I can connect and I can pair RPI and SBS. The RPI is shown on the VRM patform. So only the datatransfer frim the SBS to the Venus OS is the problem. Maybe the configuration of the Venus Application is not correct. I do not see the sensor there.
When out in the wild, the last thing you want to worry about is your power. The Smart Battery Monitor connects your 12V system to your phone via Bluetooth and delivers precise, real-time battery information to your fingertips.
As the most accurate battery monitor on the market, you can trust the Smart Battery Monitor to give you the right information when you need it most. Easily view your battery levels and an estimate of how many days power you have left, all there and updated in real-time. Up to 5 times more accurate than the leading competitor, you can trust that '2 Hours Left' means '2 Hours Left'.
Get monitoring in minutes with just three connection points and convenient configuration app. Quick and easy to add to your 12V power system. Open the app with a single touch, and your battery details are right there. It's the easy choice for keeping track of your batteries, start monitoring in minutes.
Battery users imagine a battery pack as being an energy storage device that resembles a fuel tank dispensing liquid fuel. For simplicity reasons, a battery can be seen as such; however, measuring stored energy from an electrochemical device is far more complex.
While an ordinary fuel gauge measures in-and-out-flowing liquid from a tank of a known size with minimal losses, a battery fuel gauge has unconfirmed definitions and only reveals the open circuit voltage (OCV), which is a fickle reflection of state-of-charge (SoC). To compound the problem, a battery is a leaky and shrinking vessel that loses energy and takes less content with each charge. As the capacity fades, the specified Ah (ampere-hours) rating no longer holds true. Nor can the fuel gauge assess the capacity by itself; the reading always shows full after recharge even if the capacity has dropped to half the specified Ah.
The simplest method to measure state-of-charge is reading voltage, but this can be inaccurate as load currents pull the voltage down during discharge. The largest challenge is the flat discharge voltage curve on most lithium and nickel-based batteries. Temperature also plays a role; heat raises the voltage and a cold ambient lowers it. Agitation by a previous charge or discharge causes further errors and the battery needs a few hours rest to neutralize. (See BU-903: How to Measure State-charge)
Safety is a key design objective and the concept behind SBS is to place system intelligence inside the battery pack. The SBS battery thus communicates with the charge management chip in a closed loop. In spite of this digital supervision, most SBS chargers also rely on analog signals from the chemical battery to terminate the charge when the battery is full. Furthermore, redundant temperature sensing is added for safety reasons.
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