Rich Solar ALPHA 5 PRO 51.2V 100Ah Server Rack Battery

5th of 11 we've scored in Server-Rack and Wall Batteries

5th of 11 in 48 V Batteries

Rich Solar ALPHA 5 PRO 51.2V 100Ah Server Rack Battery

48 V system
4,000-5,999 Wh
Self-heating
10-year warranty

SVT Score, Mid

Usability5.8/10Social6.3/10The SVT Score is placed on its category's range

Versus

SVT SCORESRead review

A 5,120 Wh, 51.2 V server-rack battery with a 150 W heater, Wi-Fi and Bluetooth monitoring, a touchscreen, CAN and RS485 ports and parallel expansion to 30 units.

$1,800

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SKU: RS-B5121P Category: Server-Rack and Wall Batteries Brand: Rich Solar

Usability

5.8 out of 10

Capacity551.2 V times 100 Ah is 5,120 Wh, on the 5,000 to 9,999 Wh rung for 48 V

Better on capacityECO-WORTHY PowerMega 314 BatteryStores 16,076 Wh. $2,399.99Scores 10.0

Efficiency450.7 Wh per pound at 100.9 lb on the spec sheet

Weight: the 2024 manual gives about 45 kg (99.2 lb), the same rung

Better on efficiencyECO-WORTHY PowerMega 314 BatteryAt 279.99 lb on Eco-Worthy's spec table it holds 57.4 Wh per pound. $2,399.99Scores 6.0

Operating Range5100 A continuous discharge, 1.0C on 100 Ah

Temperature: charges at 32 to 140°F, discharges at −4 to 149°F

Lifespan6More than 7,000 cycles at 70 percent depth; no end-of-life capacity published

Conflict: the product page says 80 percent depth; the 2026 spec sheet says 70

Features8150 W heater, Wi-Fi and Bluetooth, CAN and RS485; IP21, no series

Heater: switches on below 41°F
Ports: CAN, RS485, RS232 and dry contact, with an LCD touchscreen
Expansion: up to 30 in parallel on the 2026 spec sheet

Verification6ETL Listed to UL 1973 as ALPHA 5 PRO (Future Star Energy, trade name RICH SOLAR)

Holder: Future Star Energy (Shenzhen) Co., Ltd., trade name RICH SOLAR
Claim: page says UL 9540A certified; no report published (web search 2026-10-14)
Not checked: UL 9540 system listing; none found in any directory

Warranty & Support710 years, full cover three years, then prorated

Schedule: 85 percent cover in year four, falling to 5 percent in year ten

Price

List: $1,799.99 at richsolar.com
Multi-pack: two to six at $1,799.99 each; two for $3,599.98
Rack: 6-slot server rack RS-SRA5P, $1,599.99 sold separately

Summary

Heated rack battery, indoor case only

What it is: a 51.2 V, 100 Ah heated server-rack battery with Wi-Fi, Bluetooth and a touchscreen for 48 V systems
The trade-off: heating and closed-loop ports in every module, but 100 A from each and an indoor-only case
In the box: parallel power cables, a grounding wire, inverter and battery communication cables, six M5 screws
Look elsewhere for: an outdoor-rated case or more than 100 A from one module

Strengths

Heated for cold-weather charging
Wireless and touchscreen monitoring
Closed-loop inverter communication
Deep parallel expansion
Long warranty term

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Drawbacks

Indoor-only IP21 case
Heavy for its capacity
Cycle rating at a shallow depth
Warranty prorated after year three
Rack sold separately

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Social score

6.3 out of 10

RedditBrand-level4 out of 10

Scope: few Reddit threads name Rich Solar, and those found are complaints
Battery: an r/SolarDIY owner's new ALPHA 5 read 6.7 V instead of 48 V, and Rich Solar's technician had not returned his call after two days (August 2023)
Order: an r/SolarDIY buyer waited from March for an out-of-stock ground mount, then was told its price had risen from $180 to $699 and cancelled; the refund took months (May 2025)

Google7 out of 10

Liked

Touchscreen display (The Solar Lab, November 2024)
About 99 percent efficient on a 90 W load (The Solar Lab)
Works with a third-party monitoring hub, per one owner (February 2025)

Complaints

Lead-acid mode only with another maker's inverter (The Solar Lab)
Price on richsolar.com above dealers (The Solar Lab, 2024)
Wi-Fi app not yet released, per one owner (February 2025)

Read the full summary

The Solar Lab: ran it at about 108 A before the BMS cut out, measured about 99 percent efficiency on a 90 W load, saw it shut itself down at −25°C, and recommended it (November 2024)
Fault: the same tester could run it only in lead-acid mode with another maker's inverter, and called Rich Solar's own price high next to dealers
Disclosure: the written review carries dealer and richsolar.com referral links; its matching video, counted once here, was sponsored by a desk maker (26,145 views)
Owner: a DIY Solar Forum member who bought five for an RV liked them on the test bench and had them talking to a third-party monitoring hub (February 2025)

YouTubeBrand-level6 out of 10

Will Prowse: in a test of several panels a Rich Solar 200 W mono gave 157 W, 78.5 percent of rating, and a 100 W poly 88 W; he kept the poly first on his list for a small panel (May 2021, about 366,000 views)
Disclosure: Will Prowse states every video includes paid promotion or free product and some links are affiliate links

AmazonBrand-level8 out of 10

Seller: Rich Solar's Amazon US listings sit in a RICH SOLAR brand store sold and shipped by SUNRICH ENERGY
Panels: the 100 W 12 V panel family reads 4.7 from 1,326 ratings, 84 percent five-star and 2 percent one-star; the 200 W 12 V panel 4.6 from 519; the 200 W 24 V panel 4.3 from 252 (October 2026)
Controller: the BRAVO 40 MPPT controller reads 3.8 from 4 ratings (October 2026)

User reviewsNot scored

The retailer pool is blank: no US retailer listing carries ten native reviews of a Rich Solar product, and its Walmart listings hold none or one.

Trustpilot

Trustpilot rates richsolar.com 3.2 from 2 reviews, one three-star and one one-star, on a page claimed in October 2023 with no recent invitations (October 2026).

Track record

The BBB rates Rich Solar of Ontario, California an F, not accredited, on 5 complaints closed in three years (October 2026).
No CPSC or Health Canada recall names Rich Solar, searched in October 2026.
Brinkley RV's NHTSA recall 25V042000 (January 2025) replaced an overheating Rich Solar MPPT solar charge controller in up to 1,723 Model G trailers.

Not countedExcluded

Not counted in any pool: the testimonials on richsolar.com, the RICH SOLAR TALK YouTube channel, Rich Solar's Facebook pages and groups, and any brand-run subreddit.
Also not counted: Rich Solar's affiliate program and creator collaborations, dealer pages, and Explorist.life, whose co-branded panel ties it to Rich Solar.

Summary

Brand-level

3.2 on Trustpilot, an F from the BBB

Specs

Capacity4,000-5,999 Wh
AC OutputNot applicable
System Voltage48 V
Panel PowerNot applicable
Charge CurrentNot applicable
Safety ListingUL 1973 listed
Cell TypeNot applicable
Low-Temp ChargingSelf-heating
Warranty10 Years
MonitoringBluetooth built in
Weight100.9 lb

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At a glance

17.7 x 17.8 x 5.2 in
3U rack-mount metal case
Two power terminal pairs
RS232 and dry contact

Company

Rich Solar is the brand of Rich Solar Inc., which says it began in 2005 and keeps its offices and warehouse in Ontario, California.

Where it sells

It sells with a cart at richsolar.com, through a RICH SOLAR Amazon brand store run by the seller SUNRICH ENERGY, on Walmart, and through dealers such as Outbound Power.

Description

The ALPHA 5 PRO (SKU RS-B5121P; RS-B5121P1 on its Amazon listing) is a 51.2 V, 100 Ah LiFePO4 server-rack battery of 16 cells in series, rated at 5,120 Wh.

Its 2026 spec sheet gives more than 7,000 cycles at 70 percent depth of discharge, a 57.6 V maximum charge voltage, a 40.0 V cut-off, 20 A recommended and 100 A maximum charge, 100 A continuous discharge and 5,120 W maximum output.

A 150 W internal heater switches on below 41°F; it charges at 32 to 140°F and discharges at −4 to 149°F. It has Wi-Fi and Bluetooth monitoring through the RICH SOLAR app, an LCD touchscreen with LED indicators, and CAN, RS485, RS232 and dry-contact ports with selectable inverter protocols.

Two pairs of power terminals let it parallel up to 30 units. The IP21 metal case is a 3U rack-mount design measuring 17.7 x 17.8 x 5.2 in and weighing 100.9 lb on the spec sheet (about 45 kg in the 2024 manual).

The manual's packing list holds the battery, 4 AWG parallel power cables of 8.66 in, a 59.06 in grounding wire, a 59.06 in inverter communication cable, a 9.84 in battery-to-battery cable, six M5 screws and the manual.

Packs of two to six sell at $1,799.99 a battery (two for $3,599.98), and a 6-slot server rack (RS-SRA5P) is $1,599.99 separately.