Differences

This shows you the differences between two versions of the page.

--- battery_compatibility:byd_b-box [2019-01-22 10:16] – external edit 127.0.0.1
+++ battery_compatibility:byd_b-box [2019-03-16 06:38] – guy_stewart
@@ Line 29: / Line 29: @@
-=== 1.2 A Venus-device is required, either Color Control GX (CCGX) or Venus GX (VGX) ===
+=== 1.2 A Venus-device is required, eg Color Control GX (CCGX), Venus GX (VGX), etc ===
-It is essential to use the CAN-bus connection of the CCGX or VGX with the BYD batteries for the keep-alive signal, communication of charge and discharge limits, error codes and state of charge.
+It is essential to use the CAN-bus connection of a [[venus-os:start|Venus-device]] with the BYD batteries for the keep-alive signal, communication of charge and discharge limits, error codes and state of charge.
-When used with B-Box batteries, the minimum required firmware version for the [[https://www.victronenergy.com/panel-systems-remote-monitoring/color-control|Color Control GX]] is v2.15. It is highly recommended to use the latest firmware version on all connected devices, including CCGX/VGX, Inverter/Charger and MPPTs. There are regular updates to improve performance and reliability.
+When used with B-Box batteries, the minimum required firmware version for the [[venus-os:start|Venus-device]] is v2.15. It is highly recommended to use the latest firmware version on all connected devices, including CCGX/VGX, Inverter/Charger and MPPTs. There are regular updates to improve performance and reliability.
 === 1.3 All 48V Multis, MultiPlusses, MultiGrids and Quattros are compatible ===
@@ Line 55: / Line 55: @@
 __MPPTs with a VE.Direct port__
-MPPTs are controlled via the [[venus-os:start|Venus-device]]. Make sure the [[venus-os:start|Venus-device]] runs v2.15 or later, and the MPPTs to 1.30 or the latest available version.
+MPPTs are controlled via the [[venus-os:start|Venus-device]]. Make sure the [[venus-os:start|Venus-device]] runs v2.15 or later, and the MPPTs to 1.39 or the latest available version.
 The MPPT requires connection to the [[venus-os:start|Venus-device]] to regulate charge currents as the batteries require (due to temperature, etc)
@@ Line 144: / Line 144: @@
 Minimum discharge SOC for 1 single Battery Box L 3.5 is 12%; for 2 or more (7kWh+) it can be 10%.
-Up to 5 L modules can be installed per L series BCU; 6 or more will require additional BCU.
+Up to 4 L modules can be installed per L series BCU; 5 or more will require additional BCU.
@@ Line 256: / Line 256: @@
 This parameters page is also a good place to check that all batteries are connected and working properly. In normal working conditions, for the 2.5 model, the current limit is 35A per cell. For example, 140A charge current limit ( 140 / 35 = 4 ) means there are 4 BYD battery cells connected.
+Note this figure has been increased in recent firmware versions - so it may appear slightly higher (eg 40A per cell).
 === Color Control GX Configuration ===
@@ Line 313: / Line 314: @@
 {{:battery_compatibility:byd-42v.jpeg?400|}}
-Also check that your are seeing the expected 35A of discharge current per installed module.
+Also check that your are seeing the expected 35-40 A of discharge current per installed module.
 Locally on-site, you can check the Run LED on the BYD BMU, it needs to be lit up continuously:
@@ Line 361: / Line 362: @@
 This limitation also applies to charge currents as well as loads. However it is more common to have low powered loads for long periods of time than low charge currents.
-The reported State of Charge will self correct when the battery is 100% full or near 10% empty, and this can appear as sudden jumps in the VRM from very little load or charge.
+The reported State of Charge will self correct when it reaches the calibration voltage point (55.2v ~ 100% full) or near 10% empty, and this can appear as sudden jumps in the VRM from very little load or charge.
 This has no impact on actual usable capacity of battery, only on the how it is reported to the user and other systems (such as alarms or triggers).
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 There has been a firmware revision for the BYD battery modules and BMU that improves cold weather performance slightly. This manual will be updated with the new (slightly improved) specifications when stock supplied with the new firmware has had sufficient time to enter the market. Contact your BYD distributor for further information about this.
+=== 10.4 Self-Startup from Low voltage shutdown modes ===
+In a correctly configured system, the inverter will shut itself down before the batteries enter a self protective shut down state.
+If your system is supplied only with AC-bus solar charging, this may prevent the solar inverter from starting up to recharge the batteries. Therefore it is strongly recommended that there is also either a generator or DC MPPT charge controller to provide DC bus power to bring the inverter back online to allow normal recharging to resume.
+Even a single 100/20 48V MPPT charger unit with 2 x 60 cell solar panels would be sufficient to add this self correcting mechanism able to maintain the DC bus voltage and improve longterm system reliability considerably from accidental deep discharge and subsequent shut down.
 ===== 11. Further Information =====
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 ===== DISQUS =====
 ~~DISQUS~~