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  1. V

    A Tale of Two (Relay) BMS’s

    Solid state switching should be more reliable as there is no possibility of contact arcing, much quieter, faster and the MTBF (mean time between failures) is vastly greater. Unless you are switching 400 Amps then MOSFET would be a safe bet.
  2. V

    2x JBD BMS (2P4S) and 1 Victron BMV - SOC & Ah reading incorrect

    What are the model numbers of the BMS’s?
  3. V

    A Tale of Two (Relay) BMS’s

    The shunt is used to measure accurately the current, however the 10W 10ohm resistor allows current to flow when the relay it disengaged. If you examine the photo attached you can see that the negative battery goes through the shunt and then through the relay contacts. There is a black wire on...
  4. V

    A Tale of Two (Relay) BMS’s

    The resistor has a side benefit of limiting the inrush current but is primarily used to detect the current flow and direction for switching on the contactor. This is great for single pack operation and very large current flows but does not work well in parallel pack and low current applications...
  5. V

    A Tale of Two (Relay) BMS’s

    There is a 10W resistor in parallel to the contacts which it uses to detect current flow before switching on the contactor (depending on charge/discharge switch). In a parallel battery setup current flows from the other packs first and it takes a significant draw before it switches on the...
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    A Tale of Two (Relay) BMS’s

    Balance lead harness making it easy to replace BMS The Brick which has now been replaced by my original JBD Smart BMS 100A (with MOSFET’s)
  7. V

    A Tale of Two (Relay) BMS’s

    What I expected and what my friend received a few weeks before I ordered This is the brick of a BMS a received (actually two of them)
  8. V

    A Tale of Two (Relay) BMS’s

    I joined this forum a year ago and shortly afterwards purchased from a fellow forum member the following items: 16 x 280ah Docan batteries Victron 48v inverter JBD 100a BMS During the summer last year, I had been charging the batteries via 3x 655W solar panels on my garage. All the solar power...
  9. V

    SOLD - UK Sale of: 16 x 280ah Docan batteries with Victron 48v inverter and JBD 100a BMS

    Actually I’m just pricing a battery pack like this from Docan at the moment and probably going to opt for a multipluss II 3000 in the future. I’m not far from you and it does seem to be similar to what I’m after but its just as bit soon and a little outside my budget.
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