Rich Solar 12V 40A DC-DC Battery Charger

12th of 16 we've scored in DC-DC Chargers

12th of 16 in DC-DC

Rich Solar 12V 40A DC-DC Battery Charger

12 V system
40-49 A charging
1-year warranty

SVT Score, Mid

Usability3.1/10Social5.8/10The SVT Score is placed on its category's range

Versus

SVT SCORESRead review

A 12 V, 40 A alternator-to-house-battery charger with a D+ ignition trigger, a half-current mode for small alternators and lead-acid and lithium charging modes.

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SKU: RS-DC40 Category: DC-DC Chargers Brand: Rich Solar

Usability

3.1 out of 10

Capacity5500 W rated output, on the 500 to 599 W rung

Current: 40 A rated, 37 to 43 A operating range
Low current: LC terminal halves output to 20 A

Better on capacityRich Solar 60A DC-DC ChargerRich Solar's manual rates its output at 750 W. $229.99Scores 10.0

Efficiency1Above 85 percent at 30 percent load, below the 90 percent rung

Idle: quiescent current under 0.6 A

Better on efficiencyRich Solar BRAVO 50 DC DC-DC ChargerRich Solar's spec sheet. $249.99Scores 8.0

Operating Range8Smart-alternator support through a D+ ignition trigger; fixed thresholds

Input: 10 to 16 V, input current up to 68 A

Features1No solar input, Bluetooth, isolation, IP rating or parallel mode

Modes: STD, GEL, AGM, LFP and a POWER supply mode
Sensor: RJ11 port for an optional lead-acid temperature sensor

Better on featuresRich Solar BRAVO 50 DC DC-DC ChargerTakes up to 700 W of solar through MPPT. $249.99Scores 7.0

Verification2No listing for RS-DC40 in any directory; page claims CE and RoHS only

Claim: page lists CE and RoHS only (self-declarations)

Better on verificationRenogy DCC50S DC-DC ChargerIntertek's directory lists the RBC50D1S to UL 1741. $307.99Scores 8.0

Warranty & Support11 year, the warranty page's term for unlisted products

Better on warranty & supportRenogy DCC30S DC-DC ChargerRenogy's product page. $186.99Scores 4.0

Price

List: $189.99 at richsolar.com

Summary

Mid-Size alternator charging, low rated efficiency

What it is: a 12 V, 40 A alternator charger for a house battery, switched on by the D+ ignition signal
The trade-off: simple wiring and smart-alternator support, but a low rated efficiency and a 1-year warranty
Look elsewhere for: solar input, app monitoring or a 24 V house battery

Strengths

Works with smart and conventional alternators
Half-current mode for small alternators
Recovers over-discharged lithium batteries
Charges lead-acid and lithium chemistries
Charges only while the engine runs

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Drawbacks

Low rated efficiency
Short warranty
No solar input
No Bluetooth or display
Ignition and current-limit cables sold separately

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Social score

5.8 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)

GoogleBrand-level5 out of 10

Panels: DIY Solar Forum owners of Rich Solar 100 W panels reported them working as rated, one saying eight of them each pushed more than 100 W (August to September 2020)
Defects: an owner of 20 of the 100 W poly panels saw faint snail trails after a summer and found one with a broken diode wire (January 2021)
Controller: another found Rich Solar's MPPT controller OK but its setup and Bluetooth app in need of work (January 2021)
Warranty: a DIY Solar Forum owner reported Rich Solar cut its CIGS panel warranty from 5 years to 1 in 2021 (June 2026); an Escape Forum owner waited six weeks on a warranty claim (August 2024)

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

CapacityNot applicable
AC OutputNot applicable
System Voltage12 V
Panel PowerNot applicable
Charge Current40-49 A
Safety ListingNone verifiable
Cell TypeNot applicable
Low-Temp ChargingNot applicable
Warranty1 Year
MonitoringNone
Weight4.9 lb

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At a glance

10.3 x 7.4 x 3.1 in case
RJ11 temp sensor port
Red fault LED
Cooling fans

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 Rich Solar RS-DC40 is a 12 V to 12 V on-board charger that fills a house battery from a vehicle's starter battery and alternator at a rated 40 A (37 to 43 A operating range), which Rich Solar's manual rates at 500 W.

It runs from a 10 to 16 V input, draws 68 A or less, and switches on only with a 12 V signal on its D+ ignition terminal. An LC terminal halves the output to 20 A for small or older alternators, and a mode switch selects STD, GEL, AGM, LFP or a POWER supply mode.

Charging is 2-stage for lithium and 3-stage for lead-acid, with a lithium activation function for over-discharged packs. The manual rates efficiency above 85 percent at 14 V and 30 percent load, quiescent current under 0.6 A and ripple under 500 mV RMS.

It measures 10.3 x 7.4 x 3.1 in, weighs 4.9 lb, has cooling fans and a red fault LED, mounts with four screws and shares a common negative between input and output. An RJ11 port takes an optional temperature sensor for lead-acid compensation; the D+ and LC cables and the sensor are not included.

Rich Solar lists CE and RoHS. The 20 A, 40 A and 60 A models share one manual and spec sheet.