Not a member? You should Sign Up. Already have an account? Log In. To make the experience fit your profile, pick a username and tell us what interests you. We found and based on your interests. Choose more interests. With the growing availability of cheap Lithium based batteries, having both portable off grid and fixed off grid power is becoming more attractive.

Most of the BMS units commonly seen online are usually based on using TL based balancing circuits which while functional leave more to be open hardware bms bmsner for larger battery banks.

The system is designed around the ISL being used to control the main BMS functions, and to allow standalone functionality. This is a relatively new part on the market, that integrates a 14Bit ADC, voltage reference, and monitoring engine etc. It also provides a 2. This BMS is being designed for smaller off-grid power or for portable applications such as powering equipment open hardware bms bmsner the field.

This allows for a flexible menu layout, leaving options open to future development. The MSP is very low power, so even operating modes where it has to stay active and out of sleep are not a major concern. The unit maintains the cells in the pack by monitoring and balancing the cells as required, and providing the critical feature of controlling dis charge via the mosfets.

This prevents the pack being damaged by over charge or over discharge conditions. The balancing of the cells is software configurable and is performed with external fet's. Using around 80mA of balancing current is not massively high for large battery banks, but prevents open hardware bms bmsner high temperatures occurring that could cause other issues.

As the ISL monitors the cell voltages, if a cell is too high it will disconnect the charger while the balancing continues to run, allowing the balancing circuit to catch up. The use of external pass fets also allows any open hardware bms bmsner balancing, which prevents the issue that occurs on some of the TI chips, where adjacent cells cannot be balanced at the same time.

The awesome free PCBs from Elecrow arrived this morning. Around 2 weeks open hardware bms bmsner the delivery to Australia. Which is the same or faster than OSHPark. I ordered 5 each of the new display board In black soldermask and the XT30 hub In yellow. I recieved 7 of each, which was a nice surprise :. I will be doing a small review video on the board quality as part of the deal for the free pcbs.

However initially I am very, very impressed with the quality. However they are really quite good. Not the amazing gold of oshpark, but overkill for almost all of my projects. All the traces looked good with no copper issues. The solder mask on the yellow is really nice. Its more of a mustard yellow or burnt gold. Sort of a pity its not just a open hardware bms bmsner bit brighter to open hardware bms bmsner the XT60 plugs.

Nothing on these boards would have pushed the technology at all, but they did turn out well. Only slight issue is the black solder mask flakes of a little bit easily. A little bit visible in the last image, after soldering. But I do also use a rather scratchy soldering iron tip. Elecrow recently offered coupons for free PCBs so I have sent off to them the revised design.

Once these arrive back I will review the quality of manufacture as well as hopefully have a working display :. Powering up the IC using a current limited supply looked good, and no shorts showed up testing with a multimeter open hardware bms bmsner from the jumpers on the back, as I was setting this up for 3S, I had to short all the jumpers.

Once you connect a battery to the balance connector and the main power connector, you need to provide some voltage on the charging input to wake the unit up out of sleep mode. Using the testing code for the Arduino to talk to the unit, I programmed all the settings to suit my Lithium battery packs and the unit seems to be testing open hardware bms bmsner. I will probably send off a new front panel to Oshpark to have a new version made for testing soon.

The initial designs as published on the Open hardware bms bmsner repository have been sent off to seeed to be manufactured. I have also attempted to sample the BMS frontend IC from Intersil which would be rather nice, however if this falls through I will purchase some to test out the design. More updates coming when the boards arrive probably weeks away now. The plan open hardware bms bmsner to use the 3 switches at the bottom to naivgate and edit open hardware bms bmsner menu, and use the LEDs for status of the system when the lcd is off.

Also I have a fair few of these already around. This Open Hardware Bms Unity model does not have a DMA so I will eventually be implementing an interrupt based I2C and SPI driver to help speed up communications while keeping the low power that made the IC desirable in the first place. If space allows adding a set of LED's is also desired as a method of showing open hardware bms bmsner status from a distance.

This is mostly based on my previous breakout board for this IC, which was just a transfer of the EVM with only single path mode supported. Also pre-charge support is dropped due to size constraints. This design adds support for all 8 cell inputs on the IC, and converts the balancing connection to a 2x5 0. A small 2. View all 7 project logs. Create an account to leave a comment. Specifically, did you need to connect the batteries to get the chip into "normal" mode?

Are you sure? Hi, this is very open hardware bms bmsner indeed! I'm building a small droid and I found your project while searching for any open hardware BMS designs, especially because I'd be interested in integrating its features with the rest of the system. What is the current state of development?

Would be very interested to better understand the objectives of the project and any indicative timeframe, open hardware bms bmsner available. Also, in case I can help, e. How many batteries in parallel can be used? Or in other words what will limit the current here? Vedant Paranjape. Jared Young. Jake Wachlin. Become a member to follow this project open hardware bms bmsner never miss any updates. About Us Contact Hackaday.

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Max 25 alphanumeric characters. OK, I'm done! Join this project. Similar projects worth following. View Gallery. Two board construction, baseboard has the actual BMS can run fully standalone once setup.

Design: The system is designed around the ISL being used to control the main BMS functions, and to allow standalone functionality. BMS The most critical features really. I recieved 7 of each, which was a nice surprise : I will be doing a small review video on open hardware bms bmsner board quality as part of the deal for the free pcbs.

Now its just waiting for the LCD to turn up and alot of code to write :. The AFE powered up and allowed the battery voltage out the first time! The front panel of the unit has been routed and looks to be complete. This is mostly just a microcontroller with buttons and LEDs.

The rough design pass of the front end has been completed. Thanks, Richard. Similar Projects.

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