This is a 36V battery charger that outputs 43.2V DC at 25A through ring terminal connections, built by BigBattery for direct-wire installs into 36V battery systems.
Charging voltage accuracy matters as much as amperage. A charger set to the wrong termination voltage either undercharges a pack, leaving usable capacity on the table, or overcharges it, stressing cells and shortening service life. This unit is fixed at 43.2V DC, matched to 36V nominal chemistry, with ring terminal output for a hard-wired connection rather than a plug-in connector. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Critical Fitment & Requirements
- Nominal system voltage: 36V
- Charge output voltage: 43.2V DC
- Charge output current: 25A
- Output termination: Ring terminals (direct-wire, not a plug connector)
- NOT compatible with 12V, 24V, or 48V nominal battery systems
- NOT rated to charge batteries requiring a termination voltage other than 43.2V DC
Ring terminal connections depend entirely on contact quality — a loose or under-torqued lug on a 25A circuit generates localized heat every charge cycle, and repeated heat cycling can loosen the connection further, creating a feedback loop toward thermal failure. Before commissioning, torque each ring terminal to the battery manufacturer's spec using a digital torque wrench, and confirm crimp integrity on the ring terminals themselves with a hydraulic wire crimper if you've made any field modifications to the leads. After first charge, verify terminal temperature with a multimeter check for voltage drop across the connection point; a measurable drop under load indicates a resistance problem before it becomes a burned lug. Follow NEC guidance on terminal torque and conductor termination when in doubt — undersized torque is one of the most common causes of preventable connector failure in DC charging circuits.
Key Benefits
- Fixed 43.2V DC output matched specifically to 36V nominal battery chemistry
- 25A charge current for predictable charge-time planning
- Ring terminal output for a permanent, hard-wired connection point
- Manufactured by BigBattery for use with 36V systems
| Spec | Value | Unit |
|---|---|---|
| Nominal Battery Voltage | 36 | V |
| Charge Output Voltage | 43.2 | V DC |
| Charge Output Current | 25 | A |
| Output Termination | Ring Terminals | - |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Fits: 36V nominal battery systems requiring 43.2V DC charge termination with ring terminal connections.
- Does NOT fit: 12V, 24V, or 48V nominal battery systems.
- Does NOT fit: batteries or systems specifying a different charge termination voltage than 43.2V DC.
| Compliance Item | Detail |
|---|---|
| UL Listing | [NEEDS VERIFICATION] |
| IP Rating | [NEEDS VERIFICATION] |
| NEC Ampacity Reference | [NEEDS VERIFICATION] |
FAQ
What voltage battery system does this charger work with?
This charger is built for 36V nominal battery systems and outputs 43.2V DC. It is not rated for 12V, 24V, or 48V systems.
What is the maximum charge current?
The charger delivers 25A of output current at 43.2V DC.
How does this charger connect to my battery?
It terminates in ring terminals for direct-wire connection to your battery's terminal posts or bus bar.
Can I use this charger on a 48V system?
No. This charger outputs a fixed 43.2V DC, which is correct only for 36V nominal battery systems. Using it on a 48V system will undercharge the battery and can trigger inverter or BMS fault conditions.
Warranty & Registration
Manufacturer warranty terms for this charger are not included in the provided data. Refer to the "Resources (System Manuals and Warranty)" Tab above on this page for the manufacturer's warranty terms and registration process. If you have questions before you order, ask us — we always reply back.
