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--- battery_compatibility:pylontech_phantom [2019-02-28 11:46] – guy_stewart
+++ battery_compatibility:pylontech_phantom [2019-06-21 13:43] – [My system only charges the battery to 52V] iburger
@@ Line 1: / Line 1: @@
-====== Victron & Pylontech US2000B and Phantom-S =====
+====== Victron & Pylontech US2000, US3000 and Phantom-S =====
 The combination of Victron products with Pylontech lithium batteries has been tested and certified by the Victron and Pylontech R&D departments.
@@ Line 13: / Line 13: @@
 {{:battery_compatibility:pylontech_battery.png?direct&600|}}
-^  Battery ^  US2000B ^  US2000B Plus ^  US3000 Plus ^
+^  Battery ^  US2000 (Plus) ^ US3000 ^ Force-L1 ^
-|  Module capacity|  2.4 kWh |  2.4 kWh |  3.5 kWh|
+|  Module capacity|  2.4 kWh |  3.5 kWh| 3.55 kWh |
 === 1.1 Offgrid, Backup and Energy Storage Systems are possible ===
@@ Line 25: / Line 25: @@
-=== 1.2 A Venus-device is required, eg Color Control GX (CCGX) or Venus GX (VGX) ===
+=== 1.2 A GX-device is required, eg Color Control GX (CCGX) or Venus GX (VGX) ===
 It is essential to use the CAN-bus connection of the [[venus-os:start|Venus-device]] (eg CCGX or VGX) with the batteries for the keep-alive signal, communication of charge and discharge limits, error codes and state of charge.
@@ Line 88: / Line 88: @@
 The batteries will automatically detect and link to each other, no adjustment of dip switches or software changes are necessary on the batteries.
-The battery with the empty link port 0 is the master battery. Using the //VE.Can to CAN-bus BMS type B Cable//, part number ASS030720018, Plug the side which is labeled Battery BMS into the Pylontech CAN port of the master battery. Plug the side labeled Victron VE.Can into the [[venus-os:start|Venus-device]].
+The battery with the empty link port 0 is the master battery.
+You must use the //VE.Can to CAN-bus BMS type B Cable//, part number ASS030720018, you cannot use the cable supplied by Pylontech.
+Plug the type B cable with the side which is labeled Battery BMS into the Pylontech CAN port of the master battery. Plug the side labeled Victron VE.Can into the [[venus-os:start|GX device]].
 Then, plug a [[https://www.victronenergy.com/accessories/ve-can-rj45-terminator|VE.Can terminator]] in the other VE.Can socket on the [[venus-os:start|Venus-device]]. Two VE.Can terminators are included with the package of the [[venus-os:start|Venus-device]] as an accessory, only one is used. Keep the other one as a spare.
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 You can confirm if this is affecting your installation be entering the Pylontech Battery menu on your Venus-device, and then the Parameters Menu. This will report the Charge Current Limit (CCL) and Discharge Current Limit (DCL).
+==== My system only charges the battery to 52V ====
+When DVCC is enabled, the battery (via the CAN-bms) is responsible for the charge voltage. The Pylontech battery requests a charge voltage of 53.2V. We have however found that in practice this is too high.
+The Pylontech battery has 15 cells in series, so 53.2V equates to 3.55V per cell. This is very highly charged and makes the system prone to go overvoltage.
+It should also be noted that a LiFePO4 cell stores very little additional energy above 3.45V.
+For this reason we opted to override the BMS and cap the voltage at 52V. This sacrifices almost none of the capacity and greatly improves the stability of the system.
+==== The battery won't charge to 100% ====
+Also see the question above. The state of charge of the battery is estimated based on the overall voltage and on how well balanced the internal cells are. Because we cap the battery voltage at 52V, the state of charge will sometimes rise very slowly once it reaches the mid-90s. This is normal and usually resolves over time.
 ===== 10. Further Information =====