How to Charge Lithium Batteries, w/o BMS Comm.
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In the present blog, we highlighted a step by step installation guide how to set up the lithium batteries if your off-grid or hybrid inverters do not have a BMS system. The following procedure is necessary for an optimum charging process.
The LCD displays and inverter setting are corresponding to our off grid 5kW and 5kW hybrid solar inverter. This article is only valid for inverters with manufacturing date 2018 or older. The production from 2019 onwards includes a special software for establishing communication with the Battery Management System (BMS) of Pylon US200, US2000B, US2000 Plus
Conversol S1 off grid 5kW – Set up
The LCD below appears on the 5kW 48V Conversol (also known as MKS-48V, MPPT). The user defined battery is available in the menu 5.
You have to follow the below instructions in order to charge the US2000 or Phantom Pylon Batteries correctly and at the right current ratings.
- Connect the inverter to the battery to start up the system and power up the screen.
- Press Enter for 5 sec to enter the settings of the inverter
- Press ‘Up’ and ‘Down’ to choose the setting item No., press ‘Enter’ to enter into the detailed setting parameter, when finish press ‘Enter’ again. The following setting items need to be set follow the recommended value:
| Program/Menu | Settings required for US2000 |
| Program 02 | Set to N*25A, N=battery amount |
| Program 05 | Set to USE |
| Program 12 | Set to 48V |
| Program 13 | Set to 51V |
| Program 26 | Set to 53.2V |
| Program 29 | Set to 47.5V |
Table 1. Important charging parameters for lithium in US2000 batteries.
Three major settings for charging the batteries correctly
- Set bulk charging voltage
- Set float charging voltage
- Set low cut-off voltage
Note: Axpert/Conversol Inverter can only be powered up via battery, if the battery is turned off due to over-discharge, over temp. or other reasons, in order to wake up the inverter you need turn on the battery manually.
Any further questions to this SOP please contact us via help@voltacon.com
Range of charging voltage: Bulk/Floating/ Low DC Cut Off
Charging with Compatible BMS System – Conversol V5
Having a compatible inverter with Pylontech batteries, it simplifies the installation procedures and does not require any software adjustments.
The following diagrams illustrate the connection of lithium batteries to our Conversol V5 inverter/charger. This particular model has a built in communication protocol with the BMS of US2000. Using the right RJ45 ethernet cable (provided with the inverter), the user should not make alter any settings. The charging, discharging and equalization processed are managed automatically by the BMS.
The above table is a useful tool that help you to understand how much storage is required according to the back up time. We took into the the 80% depth of discharge (DOD) as worst case scenario . A battery of 2.4kWh has actually 1.95kWh usable energy every day.
| No. US2000 Batteries | Usable Energy (kWh) |
| 2 | 3.9kWh |
| 3 | 5.85kWh |
| 4 | 7.8kWh |
| 5 | 9.75kWh |
| 6 | 11.7kWh |
| 7 | 13.65kWh |
| 8 | 15.60kWh |
| Maximum No Batteries Without communication hub. |
Table 4. Back up time with lithium blocs from 2 to 8 in parallel.
Voltasol Hybrid 5.5kW inverter-Set up
