Rich Solar ALPHA 5 PRO | 51.2V 100Ah Lithium Battery

The Rich Solar ALPHA 5 PRO Stores 5,120Wh per Battery in a Heated 48V Server Rack Design That Scales to 153.6kWh

The Rich Solar ALPHA 5 PRO (RS-B5121P) is a 51.2V 100Ah LiFePO4 server rack battery that stores 5,120Wh in a 3U metal case sized for standard server racks. It supports 100A of continuous charge and discharge current, connects up to 30 units in parallel for as much as 153.6kWh, and is certified to UL 1973 and UL 9540A.

Every ALPHA 5 PRO includes a 150W internal heater, Wi-Fi and Bluetooth monitoring through the RICH SOLAR app, an LCD touchscreen, and CAN, RS485, RS232 and dry contact communication for closed-loop operation with compatible inverters. This listing offers one to six batteries, from 5,120Wh to 30,720Wh, and each battery carries a 10-year warranty.

Rich Solar ALPHA 5 PRO Features

Grade A Prismatic LiFePO4 Cells

Welded Grade A prismatic cells avoid loose internal connections and are rated for 7,000+ cycles at 80% depth of discharge. Self-discharge is 5% or less per month.

150W Internal Heater

The integrated heater starts below 41°F and stops above 50°F, warming the cells so the battery can resume charging in cold weather. Below 32°F, charging stays off until the cells are warm enough to charge safely.

Wi-Fi, Bluetooth and Touchscreen Monitoring

The RICH SOLAR app shows state of charge, voltage, current, temperature and capacity in real time over Wi-Fi or Bluetooth, and sends alerts for safe operation. The front LCD and LED indicators display state of charge, status and alarms at the battery.

Closed-Loop Inverter Communication

CAN, RS485, RS232 and dry contact ports let the battery share data with your inverter. Rich Solar publishes RS485 and CAN protocol codes for many major inverter brands, selected in the battery's system settings.

Expand to 30 Batteries

Connect up to 30 ALPHA 5 PRO batteries in parallel for up to 153.6kWh. Dual power terminals simplify wiring for large banks, and Rich Solar offers an optional server rack that holds six ALPHA 5 series batteries with 600A copper busbars.

Layered Safety Protection

The smart BMS protects against overcharge, over-discharge, overcurrent and temperature extremes, with automatic cell balancing. A built-in fail-safe circuit breaker and FET protection add a second layer of safety.

Real-World Applications

Residential backup. Pair the battery with a 48V hybrid inverter to keep a home running through outages.

Off-grid homes and cabins. Build a bank from 5.12kWh to well over 100kWh for full-time solar living.

Commercial energy storage. Scale storage for shops, offices and agricultural sites in standard racks.

Large RVs and buses. Rich Solar lists RV applications for 48V house systems.

How It Compares to Common Alternatives

Versus 12V batteries wired in series. Four 12V batteries in series need careful matching and balancing. One ALPHA 5 PRO provides 51.2V with a single BMS that talks to your inverter.

Versus one large fixed-size battery. A single large battery has to be sized up front. The ALPHA 5 PRO lets you start with one 5.12kWh battery and add more in a standard rack as your needs grow.

Versus lead-acid battery banks. A lead-acid bank of similar usable capacity is much heavier and lasts far fewer cycles. The ALPHA 5 PRO is rated for 7,000+ cycles with no maintenance.

Is This Battery the Right Fit

• System voltage. The ALPHA 5 PRO is a 51.2V battery for 48V inverters and charge controllers. Set charging to 57.6V.
• Charging. Rich Solar estimates about 6 hours with a 57.6V 20A LiFePO4 charger, about one sunny day with more than 1,500W of solar, or about 6 hours from a generator through a 20A DC-DC charger.
• Temperature. Charging is rated from 32°F to 140°F and discharging from -4°F to 149°F. The IP21 rating calls for an indoor or sheltered location.
• Size and weight. Each battery measures 17.7 x 17.8 x 5.2 inches and weighs 100.9 pounds, with built-in carry handles.

This may be a good fit if

• You are building a 48V home backup or off-grid system
• Your inverter supports closed-loop CAN or RS485 battery communication
• You want a heated battery that can charge in cold weather
• You plan to start small and expand in a server rack

Common Questions

Does Every ALPHA 5 PRO Have the Heater?

Yes. Rich Solar's ALPHA 5 PRO includes a 150W internal heater that starts below 41°F and stops above 50°F.

How Many Batteries Can I Connect?

Up to 30 in parallel, for up to 153.6kWh. This listing offers one to six batteries.

Will It Communicate With My Inverter?

The battery supports CAN and RS485 protocols for major inverter brands. Select the matching protocol code in the battery's system settings, and check your inverter's documentation.

What Is the Warranty?

Rich Solar backs the ALPHA 5 PRO with a 10-year warranty.

What's Included

• 1 x Rich Solar ALPHA 5 PRO 51.2V 100Ah LiFePO4 Battery (1-Battery Option)
• 2 x Rich Solar ALPHA 5 PRO 51.2V 100Ah LiFePO4 Batteries (2-Battery Option)
• 3 x Rich Solar ALPHA 5 PRO 51.2V 100Ah LiFePO4 Batteries (3-Battery Option)
• 4 x Rich Solar ALPHA 5 PRO 51.2V 100Ah LiFePO4 Batteries (4-Battery Option)
• 5 x Rich Solar ALPHA 5 PRO 51.2V 100Ah LiFePO4 Batteries (5-Battery Option)
• 6 x Rich Solar ALPHA 5 PRO 51.2V 100Ah LiFePO4 Batteries (6-Battery Option)

Scalable 48V Storage for Home and Off-Grid

The Rich Solar ALPHA 5 PRO gives 48V systems 5,120Wh per battery, built-in heating, app monitoring and closed-loop inverter communication, with room to grow to 153.6kWh. At Outbound Power, we help customers size battery banks and match them to inverters and solar. If you have questions about how many ALPHA 5 PRO batteries you need, our team is happy to help.

Rich Solar ALPHA 5 PRO Lithium Battery Manual