DALY BMS Releases RV Battery Management Systems with RV-C, Cold Weather Features

DALY BMS has launched a new line of battery management systems (BMS) tailored for the recreational vehicle (RV) market. These systems aim to address common issues encountered with lithium iron phosphate (LFP) batteries in RVs, including charging problems in freezing temperatures, integration problems with vehicle networks, and challenges with multi-battery configurations.

A key feature highlighted is RV-C protocol compatibility, which utilizes the vehicle's CAN bus network for communication. This allows the battery system to report its state of charge, charging limits, and fault statuses to existing RV displays and controllers. DALY specifies that "RV-C support" means the BMS is capable of communication on the network, but the implementation of specific data packets (PGNs) should be verified on a project-by-project basis.

For operation in cold climates, the new RV BMS variants include integrated control for external heating elements. This feature is crucial as LFP cells can be permanently damaged if charged below freezing temperatures. The integrated control ensures batteries can be charged safely even in sub-zero conditions by activating external heaters when necessary.

The systems also support the expansion of battery capacity through parallel connection of multiple packs. DALY's R10KB model, for instance, includes a built-in current limit to manage inrush current between batteries with slight voltage differences, preventing stress on protections and potential cell damage. For higher current demands, DALY offers AK, AM, and AS series BMS units, covering needs up to 400 amperes, with custom configurations available for higher requirements. Daly BMS outlines common voltage platforms for RV installations: 12V (4S LFP), 24V (8S LFP), and the less common 48V (16S LFP). The choice of BMS variant is determined by the specific cell count and required protection thresholds.