Power Queen 40A DC‑DC Charger vs Rich Solar 40A DC‑DC Charger

• FeaturesPower Queen 40A DC-DC Charger: 4 (higher)Rich Solar 40A DC-DC Charger: 1

  Power Queen 40A DC‑DC Charger

  • Built-in MPPT solar input, but no Bluetooth, isolation, IP rating or parallel
  • Extras: reverse charging of the starter battery and LiFePO4 BMS wake-up
  • Batteries: STD, GEL, AGM and LFP; feature text adds SLA and Calcium

  Rich Solar 40A DC‑DC Charger

  • No 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
• Warranty & SupportPower Queen 40A DC-DC Charger: 3 (higher)Rich Solar 40A DC-DC Charger: 1

  Power Queen 40A DC-DC Charger: 2 Years · Rich Solar 40A DC-DC Charger: 1 Year.

  Power Queen 40A DC‑DC Charger

  • 2 years for DC-DC chargers, no proration stated

  Rich Solar 40A DC‑DC Charger

  • 1 year, the warranty page's term for unlisted products
• EfficiencyPower Queen 40A DC-DC Charger: 2 (higher)Rich Solar 40A DC-DC Charger: 1

  Power Queen 40A DC‑DC Charger

  • Spec table gives max. 90% charging efficiency, read as a 90.0 percent peak

  Rich Solar 40A DC‑DC Charger

  • Above 85 percent at 30 percent load, below the 90 percent rung
  • Idle: quiescent current under 0.6 A

Same score

• CapacityPower Queen 40A DC-DC Charger: 5Rich Solar 40A DC-DC Charger: 5

  Power Queen 40A DC‑DC Charger

  • No wattage stated; 40 A read at 12.8 V as 512 W

  Rich Solar 40A DC‑DC Charger

  • 500 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
• Operating RangePower Queen 40A DC-DC Charger: 8Rich Solar 40A DC-DC Charger: 8

  Power Queen 40A DC‑DC Charger

  • Smart-alternator mode through the included IGN signal wire
  • Missing: no adjustable engine-run thresholds published
  • Solar: the FAQ gives the MPPT input a 10 to 30 V range
  • Temperature: works from 14°F to 104°F, stores from -4°F to 158°F

  Rich Solar 40A DC‑DC Charger

  • Smart-alternator support through a D+ ignition trigger; fixed thresholds
  • Input: 10 to 16 V, input current up to 68 A
• VerificationPower Queen 40A DC-DC Charger: 2Rich Solar 40A DC-DC Charger: 2

  Power Queen 40A DC‑DC Charger

  • No certifier directory lists it; no model code or safety listing named
  • Checked: Intertek, UL Product iQ, LabTest and TÜV SÜD

  Rich Solar 40A DC‑DC Charger

  • No listing for RS-DC40 in any directory; page claims CE and RoHS only
  • Claim: page lists CE and RoHS only (self-declarations)

Not scored for either

• LifespanPower Queen 40A DC-DC Charger: —not scoredRich Solar 40A DC-DC Charger: —not scored
• ValuePower Queen 40A DC-DC Charger: —not scoredRich Solar 40A DC-DC Charger: —not scored

• RedditPower Queen 40A DC-DC Charger: 5 (higher)Rich Solar 40A DC-DC Charger: 4

  The Power Queen 40A DC-DC Charger reading covers the whole brand; the Rich Solar 40A DC-DC Charger reading covers the whole brand.

  Power Queen 40A DC‑DC Charger

  Read the full summary

  • Overall: Reddit owners report mixed results with Power Queen batteries
  • Warranty: an r/overlanding owner says a 100 Ah stopped holding a charge after 15 months of light use, and Power Queen, though responsive, would not honor the warranty (2024)
  • Charger: an r/batteries owner of a 12.8 V 100 Ah bought as a CPAP backup found its BMS tripped on a general-purpose lithium charger; Power Queen pointed to its own 20 A charger (2024)
  • Arrival: an r/SolarDIY owner of a 25.6 V 50 Ah says it arrived with the BMS shut off and had to be jump-started before its Bluetooth showed 99 percent charge (December 2024)
  • Praised: an r/LiFePO4 commenter calls Power Queen decent for a trolling motor (2025)

  Rich Solar 40A DC‑DC Charger

  Read the full summary

  • 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)
• GooglePower Queen 40A DC-DC Charger: 5Rich Solar 40A DC-DC Charger: 5

  The Power Queen 40A DC-DC Charger reading covers the whole brand; the Rich Solar 40A DC-DC Charger reading covers the whole brand.

  Power Queen 40A DC‑DC Charger

  Read the full summary

  • Expedition Portal: the owner of a 12 V 100 Ah trolling-motor battery bought in November 2023 measured 106 Ah, also posting on DIY Solar Forum
  • Faults: he found the BMS cutting off charge near 13.9 V with its cells out of balance; Power Queen maintained the battery was fine
  • Returned: he sent it back through Amazon for a refund (February 2024)
  • Swimbait Underground: an angler running three 12.8 V 100 Ah batteries on his trolling motor posted positive first impressions (July 2024)
  • DIY Solar Forum: owners of the 12 V 200 Ah reported no problems in early use (December 2021)

  Rich Solar 40A DC‑DC Charger

  Read the full summary

  • 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)
• YouTubePower Queen 40A DC-DC Charger: 7 (higher)Rich Solar 40A DC-DC Charger: 6

  The Rich Solar 40A DC-DC Charger reading covers the whole brand.

  Power Queen 40A DC‑DC Charger

  Liked

  • Alternator, solar and reverse charging all worked in the test
  • Still in use after 14 months

  Read the full summary

  • The Off-Grid Mountain Homestead: links the charger through Amazon Associates affiliate links
  • Tested: alternator charging, solar charging and reverse charging of the starter battery; called it a valuable device for off-grid battery charging (August 2024, about 8,900 views)
  • Long term: posted an update after 14 months of use (October 2025, about 2,000 views)

  Rich Solar 40A DC‑DC Charger

  Read the full summary

  • 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
• AmazonPower Queen 40A DC-DC Charger: 4Rich Solar 40A DC-DC Charger: 8 (higher)

  The Rich Solar 40A DC-DC Charger reading covers the whole brand.

  Power Queen 40A DC‑DC Charger

  Liked

  • Charged a 230 Ah bank at up to 51 A
  • Switches between alternator and solar seamlessly

  Complaints

  • MPPT input sounds an alarm and stops charging above 30 V from a panel

  Read the full summary

  • Listing: Power Queen's Amazon US listing for the 12V 40A DC-DC (B0C5DFK5W7)
  • Rating: 3.7 from 23 ratings (October 2026)
  • Spread: 50 percent five-star, 12 four-star, 8 three-star, 16 two-star and 14 one-star

  Rich Solar 40A DC‑DC Charger

  Read the full summary

  • 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)