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The Rich Solar 12V 20 Amp LiFePO4 Battery Charger (model RS-BC12V20) is an AC charger made only for 12V LiFePO4 batteries. It runs on 100 to 240V AC at 47 to 63 Hz, draws up to 4A from the outlet and delivers 14.4V DC at up to 20A.
Rich Solar builds it with an aluminum shell, a cooling fan and LLC soft-switching circuitry. A 50A Anderson connector and M10 ring terminals make the battery connection, and the whole unit weighs 3.75 lb.
When the battery voltage is too low to take full current, a pre-charge stage feeds it a limited current until the voltage recovers. The charger then delivers a constant 20A until the battery reaches a set voltage. In the final constant voltage stage the current tapers, and once the set point is reached, the charger turns its output off.
A LiFePO4 battery's BMS can shut the battery off after a deep discharge. Rich Solar says the RS-BC12V20 activates BMS-protected batteries automatically and safely, starting with that limited-current pre-charge.
The aluminum shell and built-in cooling fan carry heat away during 20A charging. If the charger still gets too hot, its over-temperature protection pauses charging until it cools, then charging resumes.
Rich Solar's specification sheet lists protection against over-temperature, reverse polarity, short circuit, over-current and over-voltage.
Solid red means the battery is charging, solid green means it's fully charged, flashing green means standby and flashing red means a fault or protection event.
The charger's output cable ends in a 50A Anderson connector. The included Anderson-to-dual-ring cable bolts to the battery with M10 ring terminals, so you can leave it in place and plug the charger in when you need it.
At home or in the garage. Recharge a 12V LiFePO4 battery from a wall outlet at up to 20A.
On the road. Plug into any 100 to 240V AC outlet you can reach while traveling.
Recovering a sleeping battery. Bring back a 12V LiFePO4 battery that its BMS has shut off after a deep discharge.
Many general-purpose chargers are designed around lead-acid batteries. The RS-BC12V20 is made only for 12V LiFePO4 batteries, with a 14.4V output, a pre-charge stage that can wake a BMS-protected battery and an output that shuts off when charging is complete.
Use this charger only with 12V (12.8V nominal) LiFePO4 batteries, and compare your battery's specifications with the charger's before you connect. If the LED flashes red right after connecting, the manual points to reversed polarity, a short circuit or a battery that isn't a 12.8V lithium battery.
Connect the DC cable to the battery, positive to positive and negative to negative, then join the Anderson connector, then connect AC power. When charging is done, unplug the Anderson connector or the AC power. Give the charger a well-ventilated spot away from water, heat, sparks and flammable gas, keep metal objects out of the vents and don't use it during a thunderstorm. Rich Solar advises against extending the output cable or using other input cables.
No. Rich Solar lists 12V LiFePO4 batteries only, and the manual says to make sure the connected battery is a 12.8V lithium battery.
Yes. At the end of the constant voltage stage the charger turns its output off and the LED turns solid green.
Rich Solar lists a maximum input current of 4A across its 100 to 240V AC input range.
The charger is in protection. During charging, it usually points to over-temperature, and charging resumes after it cools. Right after connecting, check polarity, look for a short and confirm the battery type.
The Rich Solar 12V 20 Amp LiFePO4 Battery Charger gives a 12V LiFePO4 battery 20A three-stage charging, automatic BMS wake-up and an automatic stop at full charge in a fan-cooled aluminum case. If you'd like help choosing the right charger for your battery, the Outbound Power team is happy to help.
Rich Solar 12V 20 Amp LiFePO4 Battery Charger Specifications |
|
|---|---|
| Model | RS-BC12V20 |
| Input | |
| Input Voltage | 100-240V AC |
| Input Frequency | 47-63 Hz |
| Max Input Current | 4A |
| Output | |
| Output Voltage | 14.4V ±0.2V DC |
| Output Current | 20A |
| Battery Type | 12V (12.8V) LiFePO4 |
| Charging | |
| Charging Method | 3-stage |
| Charging Stages | Pre-charge, constant current, constant voltage |
| BMS Activation | Automatic |
| End of Charge | Output turns off when charging is complete |
| Protection | Over-temperature, reverse polarity, short circuit, over-current, over-voltage |
| Indicator | LED: solid red charging, solid green full, flashing green standby, flashing red fault |
| Physical | |
| Case | Aluminum shell with cooling fan |
| Battery Connection | M10 ring terminals and 50A Anderson connector |
| Operating Temperature | -4°F to 104°F (-20°C to 40°C) |
| Storage Temperature | -40°F to 158°F (-40°C to 70°C) |
| Dimensions | 9.06 x 3.58 x 2.07 in (230 x 91 x 52.5 mm) |
| Net Weight | 3.75 lb (1.70 kg) |
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