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The Whiz Bang Jr. is a current sense module that attaches to a standard 50mV / 500A shunt (MNShunt) and wires into MidNite Solar Classic and KID charge controllers to provide precise amperage readings. This enables EndAmps functionality based on system amps or Classic amps, allowing for more accurate battery charging and state of charge monitoring. Made in the USA.
Key Features & Benefits
Precise Current Sensing: Attaches to a standard 50mV / 500A shunt to provide highly accurate battery current readings to your MidNite charge controller.
Enables EndAmps Functionality: Allows the Classic or KID to end Absorb charging based on battery current falling below a programmable threshold, preventing overcharging or undercharging.
State of Charge Monitoring: Provides real-time SOC%, remaining amp-hours, net amp-hours, and battery temperature data on the controller's display.
Temperature Compensated Capacity: Automatically adjusts battery capacity based on temperature for more accurate SOC readings in varying climates.
Compatible with Classic and KID: Works with MidNite Solar Classic and KID series charge controllers (Classic Lite requires Local App or MNGP for setup).
Low-Side Shunt Measurement: Designed for safe low-side measurement on the battery-negative side of the shunt.
LED Status Indicator: Built-in LED provides visual confirmation of proper operation.
Type 1 Environmental Rating: Suitable for indoor installation.
5-Year Warranty: Backed by a 5-year warranty.
Made in the USA: Designed and manufactured in Arlington, Washington.
Technical Specifications
| Specification | Detail |
|---|---|
| Manufacturer | MidNite Solar |
| Model | MNWBJR |
| Compatibility | MidNite Solar Classic and KID charge controllers |
| Shunt Required | Standard 50mV / 500A shunt (MNShunt or equivalent) |
| Measurement Type | Low-side (battery-negative) |
| Connection | Single 22AWG purple wire to AUX2+ (Classic) or WBJr AUX port (KID) |
| Environmental Rating | Type 1 |
| Warranty | 5 Years |
| Made in USA | Yes |
Included Hardware
| Item | Quantity |
|---|---|
| 1/8" aluminum spacers | 2 |
| 1/4" aluminum spacers | 2 |
| 3/4" #8-32 stainless steel screws | 2 |
Note: Shunt and #8 ring terminals for 3rd party connections are not included.
Product Documents
Installation Manual: Download PDF