Renogy 12V 40A DC-DC Charger
#4 in DC-DCFull review
A cheap, quiet way to add alternator charging to a van or camper with a lithium house battery. Pay more for Victron if you want built-in Bluetooth.
Amazon $177.64$177.64
The Renogy 12V 40A DC-DC Charger is the better charge controller overall, rated 3.8 to 3.6. The Renogy 12V 40A DC-DC Charger leads on efficiency and value. The Victron Orion-Tr Smart 12/12-30 wins on warranty. The Renogy 12V 40A DC-DC Charger costs $41.66 less ($177.64 vs $219.30).
Victron Orion-Tr Smart 12/12-30
#5 in DC-DCFull review
For boats and vans that need an isolated charger from a brand with a long track record. Buyers who don’t need isolation get more current and efficiency from the Orion XS.
Amazon Northern Arizona Wind & Sun $219.30$219.30
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Renogy 12V 40A DC-DC Charger for efficiency (94% peak efficiency (maker rating) vs 87% peak efficiency (maker rating)) and value ($4.44 per amp of charge current vs $7.31 per amp of charge current).
- Choose the Victron Orion-Tr Smart 12/12-30 for warranty (5-year warranty vs 2-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every DC-DC charge controller; a clear win is highlighted. How we rank explains each one.
| Factor weight | Renogy 12V 40A DC-DC Charger | Victron Orion-Tr Smart 12/12-30 |
|---|---|---|
| Overall rating | 3.8/5 | 3.6/5 |
| Value 35% | 87 $4.44 per amp of charge current | 61 $7.31 per amp of charge current |
| Features 25% | 82 Bluetooth add-on, lithium profile, temperature sensor, smart-alternator support | 80 Bluetooth app, lithium profile, smart-alternator support; no temperature sensor |
| Efficiency 20% | 50 94% peak efficiency (maker rating) | 0 87% peak efficiency (maker rating) |
| Warranty 20% | 25 2-year warranty | 100 5-year warranty |
Specifications
| Renogy 12V 40A DC-DC Charger | Victron Orion-Tr Smart 12/12-30 | |
|---|---|---|
| Charging | ||
| Type | DC-DC charger | DC-DC charger |
| Charge current | 40 A | 30 A |
| Battery voltage | 12 V | 12 V |
| Lithium profile | Yes | Yes |
| Custom profile | Yes | Yes |
| Temperature sensor | Included | No |
| Peak efficiency | 94% | 87% |
| Standby draw | 15 mA | 1 mA |
| Inputs | ||
| DC input range | 12 to 16 V | 8 to 17 V |
| Isolated | No | Yes |
| Smart alternator | Yes | Yes |
| Ignition sensing | Yes | Yes |
| Monitoring and build | ||
| Bluetooth | Optional add-on | Built in |
| Display | No | No |
| Load output | No | No |
| Parallel units | - | Yes |
| Cooling | passive (fan-free) | - |
| Water resistance | - | IP43 |
| Dimensions | 9.31 x 6.00 x 2.30 in | 5.1 x 7.3 x 3.2 in |
| Weight | 4.1 lb | 4 lb |
| Warranty | 2 years | 5 years |