The ZYC SIMPO 5000 batteries They work with Victron in two ways: with CAN communication, which is the recommended option, or no communication, by manually setting the voltages on the inverter. This guide covers both methods, using the manufacturer’s official values.
With CAN, the battery’s BMS is in charge: it tells the Victron how much current it can handle, what voltage to charge to, and when to stop. This is the setting that prevents any nasty surprises and allows you to see the actual state of charge on the GX and the VRM.
ZYC recommends the cable VE.Can to CAN bus BMS type A from Victron. If you’re going to connect the cable yourself, here is the pin mapping between the INV port on the master battery and the Victron:
| Sign | Pin on the battery (INV) | Pin on Victron |
| CAN_H | 4 | 7 |
| CAN_L | 5 | 8 |
The battery’s INV port uses the following pin configuration: pins 4 and 5 for CAN_H and CAN_L, and pins 7 and 8 for RS485B and RS485A. The remaining pins are reserved.
The LED RUN A steady light indicates that the battery is operating in communication mode with the inverter.
If, for whatever reason, you’re not going to wire up the communication (an old Victron, a standalone MPPT, a separate charger), the SIMPO 5000 works just the same, but You have to set the voltages. These are the official ZYC values for Victron chargers:
| Parameter | Value |
| Absorption voltage | 54.4 V |
| Floating voltage | 54.0 V |
| Maximum load voltage | 55.5 V |
With these settings, the charger operates within the BMS’s operating window. If you set higher voltages, the BMS will cut off due to cell overvoltage (protection at 3.75 V per cell) and the system will shut down.
The battery starts up always in communication mode by default. To switch to offline mode, with the battery switched on, do the following: double-click the ON/OFF button: the SOC indicators will flash twice to confirm the change.
The BMS remembers the mode, so there is no need to repeat this at every start-up. And as soon as it detects that the communication cable to the inverter is connected, it will automatically return to communication mode. In this mode, the RUN LED flashes slowly (on for 1.5 seconds, off for 1.5 seconds).
Before configuring anything, make sure that the battery bank has sufficient capacity to meet the current draw of the inverter. A MultiPlus-II 48/5000 in an off-grid installation requires at least 2 modules; a Quattro 48/15000 isolated three-phase unit, 12. You can find the full table at How many ZYC SIMPO 5000 batteries do I need, depending on my inverter?.
With the SIMPO WiFi module You can check the status of the battery bank remotely via the ZYC Portal or the ZYC Assist app, and update the firmware. The dongle connects to the IN port on the master battery and links to the router via an Ethernet cable or Wi-Fi.
If you’re using a Victron GX, the battery’s firmware can also be updated from VRM: Download the file from the ZYC portal, upload it via the “ZYC battery” device entry in the device list, and the system will take care of the rest.
This is the feature that has caught our attention the most and is the least talked about. The SIMPO 5000’s firmware It can be updated remotely via the Victron VRM portal: Download the file from the ZYC Portal, go to the system’s device list, search for “ZYC battery”, upload the file, and the system will take care of the rest.
For those who maintain third-party installations, this changes the economics of after-sales service: a firmware update no longer requires a call-out. And in remote mountain locations, that call-out takes half a day and a tank of diesel.
The modules automatically assign master and slave roles amongst themselves. There is no need for an external management device, additional cabling or extra costs: they are connected in a daisy chain and the system organises itself. This is one of the reasons why the bank is up and running in minutes, without a laptop or an app.
ZYC manufactures a cabinet designed to integrate the Victron RS19 and the GX monitor in the same cabinet, with the DC busbar, fuse holder and wiring factory-fitted. It covers 6 to 18 kVA and 10 to 46 kWh of battery capacity. If you regularly install Victron equipment, do ask us about this configuration.
The 6-door cupboards y 10 units they have a DC busbar sized for 600 A and 1,000 A output, respectively, with an integrated fuse box. This avoids the need to fit a separate distribution board until several cabinets are required.
We set up Victron systems every day. If you’re working with the equipment and something isn’t quite right, please get in touch.
Installation guide for a ZYC SIMPO 5000 bench: location, 6- and 10-unit cabinets, cable cross-sections and tightening torques, multiple cabinets in parallel, start-up, LEDs and maintenance.
Table showing the minimum battery configuration for the ZYC SIMPO 5000 by inverter model: Victron, Deye, SMA, Studer, Goodwe and Solis, for both grid-connected and off-grid installations.
We compared the ZYC SIMPO 5000 battery with the Pylontech US5000, using the specifications: usable energy, cycle life, cold-start capacity, scalability and compatibility. And where Pylontech continues to come out on top.
Victron campervan electrical system pre-fitted to a panel: inverter, lithium battery, Orion XS booster, charger and MPPT – all wired, protected and configured. Schematic diagram, sizing, 220 V, type approval and indicative prices.
