Power Queen 12V 40A DC-DC Battery Charger with MPPT Solar Input
SVT Score, Mid
Power Queen’s 40 A, 12 V DC-DC charger with a built-in MPPT solar input, an ignition wire for smart alternators and reverse charging of the starter battery.
$170
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Usability
3.9 out of 10Power Queen states no output wattage, so its 40 A is read at 12.8 V as 512 W, the 5 rung, and it scores 5 on capacity.
Better on capacityRenogy DCC50S DC-DC Charger50 A output works out to 640 W at 12.8 V. $307.99Scores 8.0- Its spec table gives charging efficiency of max.
- 90%, read as a 90.0 percent peak, the 2 rung, so it scores 2 on efficiency.
Better on efficiencyRenogy DCC50S DC-DC Charger$307.99Scores 4.0Power Queen's FAQ says it works with smart alternators through the included IGN signal wire to the vehicle ignition port, a smart-alternator mode, but it publishes no adjustable engine-run thresholds, so it scores 8 on operating range.
It has a built-in MPPT solar input, but no Bluetooth, no stated galvanic isolation, no published IP rating and no parallel operation, so it scores 4 on features.
Better on featuresRenogy DCC50S DC-DC ChargerTakes up to 660 W of solar through MPPT. $307.99Scores 6.0No certifier directory (Intertek, UL Product iQ, LabTest or TÜV SÜD) lists this DC-DC charger under Power Queen or Shenzhen Lizu Time Technology, Power Queen publishes no model code a directory could match, and its product page names no safety listing, so it scores 2 on verification.
Better on verificationRenogy DCC50S DC-DC ChargerIntertek's directory lists the RBC50D1S to UL 1741. $307.99Scores 8.0Power Queen's warranty policy gives DC-DC chargers 2 years, with no proration stated, so it scores 3 on warranty and support.
$169.99 at ipowerqueen.com.
Alternator plus Solar in one
The Power Queen 12V 40A DC-DC (P12V40A-DC-Z) is Power Queen's 40 A alternator-to-house-battery charger with a built-in MPPT solar input, for 12 V house batteries in RVs, vans, trucks and boats.
It suits a buyer charging one 12 V house battery from a vehicle alternator and a small 12 V panel, and who will not need more than 40 A, panels above 30 V or app monitoring.
Strengths
- Built-in MPPT solar input beside the alternator input
- IGN signal wire for smart alternators
- House battery can charge the starter battery in reverse
- Wakes a LiFePO4 battery after BMS shutdown
- Standby draw under 0.6 A
Drawbacks
- Charging efficiency max. 90 percent
- Solar input limited to 10 to 30 V
- Size 11.65 x 8.46 x 3.35 in on the spec table5.83 x 1.89 x 7.44 in in the feature text
- No Bluetooth or app monitoring
- No galvanic isolation or IP rating stated
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
- Warranty2 Years
- MonitoringNone
- Weight4.9 lb
At a glance
- Anderson connectors included
- LED charge status lights
- VSR trickle-charges starter
Power Queen is the brand of Shenzhen Lizu Time Technology Co., Ltd of Shenzhen, China, which holds its US battery trademark, while its privacy policy names Starrysea Co., Limited of Tsim Sha Tsui, Hong Kong, the company LiTime's contact page also names, and its own pages give no founding year.
It sells direct from ipowerqueen.com, which ships US orders from US warehouses, and through its own Amazon, Walmart and eBay stores, with separate stores for Canada, Germany, France and the UK.
The Power Queen 12V 40A DC-DC (P12V40A-DC-Z) is a 40 A, 12 V on-board charger that charges a house battery from a vehicle alternator and, through a built-in MPPT solar input, from panels; Power Queen's FAQ gives that input a 10 to 30 V range. Its spec table lists STD, GEL, AGM and LFP batteries (the feature text adds SLA and Calcium), an 11.3 to 16.0 V house-battery range, charging at 14.6 V for lithium and 14.4 to 14.8 V for lead acid, temperature compensation of -3 mV/°C/2V for lead acid only, max. 90% charging efficiency, a 680 W maximum alternator input and standby self-consumption under 0.6 A. For smart alternators it uses the included IGN signal wire to the vehicle ignition port. A voltage-sensitive relay trickle-charges the starter battery from solar, the house battery can charge the starter battery in reverse, and it can wake a LiFePO4 battery whose BMS has shut off. It has LED status indicators and Anderson connectors, works from 14°F to 104°F and stores from -4°F to 158°F. The spec table gives 11.65 x 8.46 x 3.35 in and 4.85 lb; the feature text gives 5.83 x 1.89 x 7.44 in. The store shows an auto-applied 10% cart discount through October 14, 2026.
Questions answered from our data
Is Power Queen good?We list 12 Power Queen products and score 12 of them. Their overall scores run from 4.6 to 6.1, with a median of 5.4, against a median of 5.5 for all 127 products we score.
How much does a DC-DC charger cost?The 12 dc dc chargers we list run from $141 to $410, with a median of $188.
Are DC-DC chargers UL listed?Two of the 12 dc dc chargers we list carry a UL 458-type listing we could look up by model.
Which DC-DC chargers have Bluetooth?Five of the 12 dc dc chargers we list offer Bluetooth monitoring, built in or as the maker's add-on.
