Balancer
About the Balancer PCB
Balancer is an open source PCB design by kwiecinski, published on GitHub under the MIT license. It is a 2-layer board measuring 99.5 × 99.5 mm, with 165 components from 73 distinct parts.
Other key parts include the 74AHCT125, LM324, LMV358, AVR64DD28 and LM317_TO-220. By type, the board carries 62 resistors, 35 capacitors, 21 diodes, 16 connectors, 15 transistors and 12 ICs.
It belongs with the iot & wireless, power & battery and sensors designs in this gallery.
From the project
Project contains BMS for lead-acid batteries and ESP-based board used to pull information from EASUN offgrid inverter, energy meters and sensors. It show informations od displays and use ESPhome to send it to Home Assistant..
1. Photovoltaic modules 2. Concrete base mounting 3. Metalworking and welding mounting bases and angle bar 4. Painting mounting base, angle bars and perforated profiles 5. PV mountings to perforated profiles 6. Assembly of PV installation 7. Fully assembled PV installation 8. Underground Cable Installation and Connection to the Building
B. EASUN inverter - description, installation schematic and wiring #### C. Managemenet system part: - BMS for lead-acid batteries - equalize battery, protect from large charge/discharge currents, montors battery state (temp, voltage) - ESP32 Master module -…
Main components on the Balancer
Balancer bill of materials (BOM)
165 components, 73 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74AHCT125 | SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | LM324 | SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | LMV358 | SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | AVR64DD28 | SOIC-28W_7.5x17.9mm_P1.27mm | U4 |
| 1 | LM317_TO-220 | TO-220-3_Vertical-little-bigger pads | U5 |
| 1 | LM7805_TO220 | TO-220-3_Vertical-little-bigger pads | U6 |
| 1 | TL432DBZ | SOT-23 | U7 |
| 1 | ADUM3211ARZ | SO-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | PC817 | DIP-4_W7.62mm | U9 |
| 1 | B0505S-1W | B0505S | U10 |
| 1 | ST485 | SOIC-8_3.9x4.9mm_P1.27mm | U11 |
| 1 | INA226 | VSSOP-10_3x3mm_P0.5mm | U12 |
| 1 | LM2596-Step-Down | LM2596-Step-Down-Conv | MOD1 |
| 9 | BC817 | SOT-23 | Q1, Q2, Q9, Q10, Q13, Q14, Q17, Q18 +1 |
| 2 | BC807 | SOT-23 | Q11, Q19 |
| 2 | IRF540N | TO-220-3_Vertical-little-bigger pads | Q12, Q20 |
| 2 | AO3400A | SOT-23 | Q15, Q16 |
| 1 | batt-24V-balancer | PinSocket_1x04_P2.54mm_Vertical | J1 |
| 1 | pwm-12v-local | PinSocket_1x04_P2.54mm_Vertical | J2 |
| 1 | R-Shunt | PinHeader_1x02_P2.54mm_Vertical | J3 |
Show 53 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TMP_BALANCER | JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J4 |
| 1 | TMP_SMPS | JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J5 |
| 1 | THERMISTOR_BATT | JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J6 |
| 2 | LOAD_RESISTOR | Conn_1x2_wire | J7, J11 |
| 1 | FAN_BALANCER | JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J8 |
| 1 | FAN_SMPS | JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J9 |
| 1 | BATT_12V | Flat-6,3mm-connector-2P | J10 |
| 1 | V_MEAS | JST_XA_1x03_P2.54mm_Vertical | J12 |
| 1 | LED | JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J13 |
| 1 | ICP | JST_XA_1x03_P2.54mm_Vertical | J14 |
| 2 | RS485 | Conn-01x04-N25-W4P | J15, J16 |
| 1 | 6,3A | Fuseholder_Clip-5x20mm_Eaton_1A5601-01_Inline_P20.80x6.76mm_D1.70mm_Horizontal | F3 |
| 1 | 2A | Fuse_2920_7451Metric_Pad2.10x5.45mm_HandSolder | F4 |
| 1 | GND_Bridged | SolderJumper-2_P1.3mm_Bridged2Bar_Pad1.0x1.5mm | JP1 |
| 1 | LL4148 LED | LED_D5.0mm | D1 |
| 1 | LED | LED_D5.0mm | D2 |
| 8 | BAT86 | D_MiniMELF | D7, D8, D9, D12, D13, D14, D15, D16 |
| 4 | SM6T15A | D_SMB | D10, D11, D17, D18 |
| 2 | 1N4148 | D_MiniMELF | D19, D20 |
| 2 | D_TVS | Nexperia_CFP3_SOD-123W | D21, D22 |
| 3 | PTVS5V0Z1USK | D_SOD-123 | D23, D24, D25 |
| 13 | 100n | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5, C6, C10, C14, C17, C18, C20, C21 +5 |
| 4 | 10u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7, C15, C22, C25 |
| 2 | 470u/25V | CP_Radial_D8.0mm_P2.50mm | C8, C16 |
| 2 | 1u | C_Disc_D5.0mm_W2.5mm_P2.50mm | C9, C19 |
| 1 | 1u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11 |
| 2 | 47n | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C12, C13 |
| 1 | 470n | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C23 |
| 1 | 100u/6,3V (JA8) | CP_EIA-3528-21_Kemet-B | C24 |
| 1 | 220u/35V | CP_Radial_D8.0mm_P2.50mm | C26 |
| 1 | 470u/16V | CP_Radial_D8.0mm_P2.50mm | C27 |
| 1 | 220u/6,3V | CP_Radial_D8.0mm_P2.50mm | C29 |
| 1 | 100u/25V | CP_Radial_D8.0mm_P2.50mm | C30 |
| 2 | 10u | C_1206_3216Metric | C31, C38 |
| 3 | 100n | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | C35, C36, C37 |
| 11 | 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R3, R23, R34, R35, R37, R38, R45 +3 |
| 2 | 220R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R50 |
| 1 | 10K 220R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 3 | 4k7 | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5, R6, R31 |
| 4 | 150k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R21, R22, R24, R25 |
| 13 | 1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R26, R27, R28, R29, R30, R43, R44, R46 +5 |
| 1 | 470R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R32 |
| 5 | 10R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R33, R51, R71, R72, R73 |
| 2 | 10R | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R36, R55 |
| 3 | 100R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R39, R40, R57 |
| 2 | 210mR | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R41, R42 |
| 6 | 10k/1% | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R47, R48, R52, R53, R54, R56 |
| 1 | 2k2 | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R49 |
| 2 | 0R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R58, R74 |
| 1 | 6k8 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R59 |
| 3 | 510R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R63, R68, R70 |
| 1 | 4k7 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R67 |
| 1 | 120R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R69 |
Balancer design files
The KiCad project lives in the kwiecinski/BMS-and-offgrid-photovoltaic-management-system repository on GitHub; these links point at the commit this page was built from.
Balancer: common questions
How big is the Balancer PCB?
The Balancer measures 99.5 × 99.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Balancer?
165 components, from 73 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Balancer design files?
From the kwiecinski/BMS-and-offgrid-photovoltaic-management-system repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Balancer design in my own project?
Yes, under the terms of its MIT license, which kwiecinski chose for the repository.
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