Knowledge Base › Battery Control Units
Dyness Tower BDU (Battery Distribution Unit) + Base
Verified distributor GLOBAL verified Sept. 2, 2026
Identity
| category | battery_control_units |
| description | Battery controller unit that sits at the top of a Dyness Tower high-voltage battery stack, containing the DC breaker (master switch and short-circuit protection), power-on switch, power-wake button and the EXT-CAN RJ45 port to the inverter. |
| ean | 2010000029497 (7SUN distributor listing) |
| generation | UNKNOWN |
| gtin | UNKNOWN |
| launch_year | UNKNOWN |
| manufacturer | Dyness (Daqin New Energy Tech (Taizhou) Co., Ltd.) |
| marketing_name | Dyness Tower BDU (control module) |
| model | Tower BDU (Battery Distribution Unit) + Base |
| part_number | ES-BC-EU (as listed by distributor 7SUN) |
| product_type | battery distribution unit / system controller |
| region | GLOBAL |
| series | Tower |
| sku | F12B2 (7SUN distributor SKU) |
| status | UNKNOWN |
Electrical
| breaker_rating | UNKNOWN |
| max_current | UNKNOWN |
| note | The 7SUN distributor page prints voltage figures (Tower T7 168-219V / 192V nominal, Tower T21 504-657V / 576V nominal, max continuous power 4.26-12.78kW). These are SYSTEM-level Tower figures, not BDU-only ratings; the distributor page conflates the two. They are therefore NOT asserted as BDU specifications and are preserved in raw_discovered instead. |
| power_consumption | UNKNOWN |
| supply_voltage_nominal | UNKNOWN |
| supply_voltage_range | UNKNOWN |
Physical / mechanical
| colour | White (7SUN listing) |
| dimensions_mm | 504*380*156.5 |
| dimensions_source_note | From the packing list of the Tower ESS Unit User Manual v3.3 - explicitly the BDU dimension. |
| enclosure_material | UNKNOWN |
| mounting | mounts on the Base at the bottom / head of the Tower stack |
| weight_kg | UNKNOWN |
| weight_note | The 7SUN distributor page prints 25.5 kg, but that page conflates Tower-system and BDU specifications, so it is not asserted here. Recorded in raw_discovered and data_conflicts. |
Installation
| installation_notes | External power cable to the inverter; EXT-CAN RJ45 communication cable to the inverter. |
| mounting_type | stacked Tower assembly on a Base |
Environment
| max_altitude_m | UNKNOWN |
| note | 7SUN prints charging 0 to 50degC and discharge -10 to 50degC - these are battery-cell temperature limits for the Tower system, not BDU environmental limits, and are not asserted here. |
| operating_temperature | UNKNOWN |
| relative_humidity | UNKNOWN |
| storage_temperature | UNKNOWN |
Interfaces & connectors
| bluetooth | UNKNOWN |
| can | True |
| cloud_api | UNKNOWN |
| communication_ports | ['EXT-CAN communication port (RJ45)'] |
| dry_contact | UNKNOWN |
| ethernet | False |
| local_api | UNKNOWN |
| modbus_rtu | UNKNOWN |
| modbus_tcp | UNKNOWN |
| mqtt | UNKNOWN |
| protocol_notes | Tower ESS Unit User Manual v3.3 documents an EXT-CAN RJ45 port to the inverter. The 7SUN distributor page additionally claims CAN: Yes, RS485: Yes and RS232 supported. NO DIP switch table, address setting table or inverter protocol selection table exists anywhere in the Tower ESS Unit User Manual v3.3 - this was explicitly checked and is absent. |
| rs232 | UNKNOWN |
| rs485 | True |
| usb | UNKNOWN |
| wifi | UNKNOWN |
Protection
| ip_rating | UNKNOWN |
| ip_rating_note | 7SUN prints IP54, but for the Tower system as a whole; not asserted as a BDU rating. |
| overcurrent_protection | DC breaker integrated in the BDU (master switch and short-circuit protection) |
| surge_protection | UNKNOWN |
Certifications
| marks | [] |
| note | 7SUN prints UN38.3/CE-EMC/IEC62040/IEC62619/IEC62477/IEC60730 for the Tower system; these are not asserted as BDU-specific certifications. Preserved in raw_discovered. |
| standards | [] |
Warranty & service
| note | 7SUN prints 10 years, but for the Tower battery system; not asserted for the BDU. |
| terms | UNKNOWN |
| years | UNKNOWN |
Documents
Recorded conflicts
physical.weight_kg Review required
25.5 kg — 7SUN distributor BDU product page
UNKNOWN — Tower ESS Unit User Manual v3.3 - gives BDU dimensions in the packing list but no BDU weight
Additional documented parameters
Recorded verbatim from the source; no schema field exists for these yet.
| documented_relationship:control_unit_for_battery_system | {"to_manufacturer": "Dyness", "to_model": "Tower (T7 / T10 / T14 / T17 / T21 high-voltage battery system)", "match_level": "series", "relationship_type": "control_unit_for_battery_system", "status": "manufacturer_documented", "source": "Tower ESS Unit User Manual v3.3", "source_url": "https://7sun.eu/wp-content/uploads/2025/06/Dyness-Tower-T7-T21-Manual.pdf", "confidence": "distributor-verified"} |
| manufacturer_legal_entity_as_printed | Daqin New Energy Tech (Taizhou) Co., Ltd. |