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stevomyatt avatar image
stevomyatt asked

Lynx Smart BMS + WS500

Hi, I see the new schematic diagram showing the lynx bms and ws500 indicates that CAN comms to the ws500 is still under development. Any indication when this might be ready?

With the ATC control of the ws500, does this open before the contactor opens to avoid load dump damage to the alternator? Is this also the case when the bms is turned off by the remote contact?

Also wondering how the relay output is configured on the lynx bms and why the ATC signal is wired through the relay for the ws500?


Thanks and nice work on the new product!

BMS
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bathnm avatar image
bathnm answered ·

Details to support the diagrams I believe are coming. I believe you are correct in your assumption. The relay will when firmware in the Lynx BMS is updated and relay mode set within updated VictronConnect allow the relay to open seconds before the contractor on the Lynx BMS opens, thus allowing the Wakespeed to shut down before the batteries are disconnected, thus protecting against load dump.

Not aware of any timelines for CAN integration, but hope soon as I’d really like to go down that route. Note that you will need a special CAN cable as the pin outs in the Wakespeed and Victron are different….

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stevomyatt avatar image
stevomyatt answered ·

Note full CAN support has been released between Victron and Wakspeed, with the Victron wiring diagram updated accordingly. Excellent work!

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bathnm avatar image
bathnm answered ·

Yes all works great. Make sure you use the configuration on the Wakespeed site and beta firmeware

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stevomyatt avatar image
stevomyatt answered ·

Hi @Bathnm, are you able to provide any detail on the battery temp over CAN to the WS500? I have Victron smart lithiums and a Lynx BMS on CAN to a WS500.

$AST: BTemp is reporting -99

The Lynx/WS500 wiring diagram indicates a wired battery temperature sensor is not required.

I'd like the WS500 to shutdown dependent on battery temperature over CAN. Do you know if this is possible/should be working?

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bathnm avatar image bathnm commented ·

@stevomyatt Hello there. The value of -99 is because no temperature sensor has been detected. For information the same will be reported for alternator temperature if there is no sensor on that connection.

The WS500 will follow charging criteria (voltage and current) as set by the Lynx Smart BMS. The Lynx Smart BMS will know if there is a temperature issue, aka too cold, and will send the relevant CAN messages to stop charging, as it does today for the MultiPlus/Quatro and MPPTs

There is no need to wire any temperature sensors to the WS500 or receive any via CAN.

For information you will see the WS500 in status EXT Control, just like the MPPTs and MultiPlus/Quattro.

You need to make sure that the system follows the configuration as defined in the default Lynx Smart BMS configuration as published on the WS web site. This ensures that when the Lynx Smart BMS opens it contractor or signals a charge disconnect or the WS500 looses contact with the Lynx Smart BMS the WS500 actions the correct behaviour.

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stevomyatt avatar image stevomyatt bathnm commented ·
Thanks @Bathnm, that all makes sense. I'm currently testing with WS 2.5.0 and Lynx config modified for shunt = not at battery (plain shunt installed on alternator positive) and ignore sensors = 0.
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bathnm avatar image bathnm stevomyatt commented ·

@stevomyatt great that is how I have it configured. If you pull the CAN on the LynxBMS, you should see the WS500 error in the VenusOS UI and also drop charge to a get home voltage level of 13.2 for a 12v system or 26.4v on a 24v system. If you pull the charge disconnect, which is wired to the feature in, the regulator should switch off and also provide an error on the VenusOS UI.

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stevomyatt answered ·

@Bathnm

Regarding the WS500 target amps. This appears to correspond to the VenusOS charge current limit (CCL) (200A in my case). In VenusOS DVCC settings, when I set Maximum Charge Current to 100A, this is not reflected in the WS500 - it remains as 200A.

It would be nice if the WS500 could be incorporated into the Victron maximum charge current logic.

Target Amps.png

Limit Charge Current.jpg

Screenshot_20220626-211952_VRM.jpg


target-amps.png (49.2 KiB)
limit-charge-current.jpg (316.9 KiB)
screenshot-20220626-211952-vrm.jpg (196.4 KiB)
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bathnm avatar image bathnm commented ·
@stevomyatt. The WS500 is taking it's charge direction from the Lynx Smart BMS (Feature introduced to the WS500 in 2.4.2 with CAN profile 16 and 17). What has been introduced in VenusOS2.90 Beta and WS500 2.5.0 Beta is the ability to monitor the WS500 from VenusOS. What you are requesting is the integration of WS500 into the Victron DVCC structure so that the WS500 takes charging targets from VenusOS, this is not targeted for these two releases.
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stevomyatt avatar image stevomyatt bathnm commented ·
@Bathnm ok, perhaps in the future if the integration progresses!
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