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TAO BMS features that provide particular benefits

We recently installed a 700Ah LFP battery, TAO BMS, Victron Energy Quattro charger/inverter, Smart Shunt, and Cerbo, and a number of other components including bus bars, cables, contactors, and so on (replacing an AGM bank and older Mastervolt equipment). We did the installation based on a professional system design and with the help of a licensed marine electrician. As with any large project such as this we have had a number of small problems - some related to configuration (VE documentation is difficult to find to the required level of detail) and some to the installation, which is what this post is about. We are live aboard so this has allowed us time to get familiar with the system and to work out solutions.

The TAO BMS has several features that have really helped with trouble shooting our new system. 

  1. Temperature and voltage per cell, with configurable alarms that clearly display on the LED panel. During charging with higher amperage (120A to 160A), or high draws (-200A to -400A) we were frequently getting temperature differential between cells alarm, particularly cell #1 (primary negative) being higher than the other 3 cells. Physical investigation found that about half of the terminal bolts, including 3 of the 4 bolts on cell #1, were not very tight. We re-secured all terminals and can now see that temperature differentials even under heavy charging and discharging.
  2. Simulation mode, where you can input test values for cell voltage and/or temperature, make testing the relay operation very easy, without the risk of changing trigger values in the actual configuration file (other than to set the time delay after relay activation to 0 seconds). We tested both high voltage warning and low voltage warning relays with the Quattro and a VE MPPT solar regulator, as well as the high voltage and low voltage cutoff relays to the charge and discharge contactors. The simulation testing had us discover an error in our relay installation, where the use of one high voltage warning relay split between Quattro and solar regulator led to conflicts and the solar regulator not working as required. TAO BMS has 6 relays, so we were able to use an additional (initially unused) relay for the solar regulator and separate it from the Quattro. 

We'll be adding the TAO Monitor next and connecting it via CAN to the Cerbo. This should add better control of charging and inverting based on what our battery actually needs, rather than the static algorithms available in the equipment.

jlubimir and Skokie have reacted to this post.

Thanks for the feedback.  Pleased that some of the unique features of the TAO BMS have been useful to you.

I strongly recommend that the SIMULATION feature be used regularly to validate that the settings and the connections between equipment produce the expected outcome to protect the battery, your installation and your crew.   A connection becoming loose, a corroded wire, a faulty electronic equipment, a human error when changing settings...  may disable the effectiveness of a protection measure piloted by the BMS!

Foxy Kitty-

I am about to order a Tao BMS.  We have had less than acceptable results from two other BMS systems which have cost us dearly in failed cells. 

Our boat has a similar cell layout with 8 x 3V (nominal)  700Ah Sinnoply (Winston) battery cells connected in series for a 24V house bank.  I have an Elcon 60A Charger optimized for LiFePO4 batteries which can communicate via CAN.  Also have (2) 17V / 130W solar panels connected in series via a Victron MPPT controller.   Engine driven charging is (2) 120A large case LN alternators controlled by a Balmar external voltage regulator.

8Kw Genset  feeds a Xantrex/ Freedom 3000 Inverter/ Charger capable of 100A charging at 24V nominal.

Would you be willing to share your install schematic so I do not miss anything?




John Lubimir

S/V Patriot