A budget 40 A controller for owners who are happy setting it up on its own screen. Add the Bluetooth adapter if you want phone monitoring.
Amazon $118.99The EPEVER Tracer 4210AN G3 rates 3.9 among MPPT solar charge controllers; the Renogy 12V 40A DC-DC Charger rates 3.8 among DC-DC ones. The EPEVER Tracer 4210AN G3 costs $58.65 less ($118.99 vs $177.64).

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 $177.64Prices 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.
Scores side by side
These two sit in different type classes (MPPT solar and DC-DC), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | EPEVER Tracer 4210AN G3 | Renogy 12V 40A DC-DC Charger |
|---|---|---|
| Overall rating | 3.9/5 | 3.8/5 |
| Value 35% | 94 $2.97 per amp of charge current | 87 $4.44 per amp of charge current |
| Features 25% | 59 Bluetooth add-on, lithium profile, temperature sensor; no temperature sensor | 82 Bluetooth add-on, lithium profile, temperature sensor, smart-alternator support |
| Efficiency 20% | 75 98% peak efficiency (maker rating) | 50 94% peak efficiency (maker rating) |
| Warranty 20% | 25 2-year warranty | 25 2-year warranty |
Specifications
| EPEVER Tracer 4210AN G3 | Renogy 12V 40A DC-DC Charger | |
|---|---|---|
| Charging | ||
| Type | MPPT solar charge controller | DC-DC charger |
| Charge current | 40 A | 40 A |
| Battery voltage | 12/24 V | 12 V |
| Lithium profile | Yes | Yes |
| Custom profile | Yes | Yes |
| Temperature sensor | Optional extra | Included |
| Peak efficiency | 98% | 94% |
| Standby draw | 8 mA | 15 mA |
| Inputs | ||
| Max PV voltage (Voc) | 100 V | - |
| Max PV power (12 V) | 520 W | - |
| DC input range | - | 12 to 16 V |
| Isolated | - | No |
| Smart alternator | - | Yes |
| Ignition sensing | - | Yes |
| Monitoring and build | ||
| Bluetooth | Optional add-on | Optional add-on |
| Display | Yes | No |
| Load output | Yes | No |
| Cooling | - | passive (fan-free) |
| Water resistance | IP30 | - |
| Dimensions | 252 x 180 x 63 mm | 9.31 x 6.00 x 2.30 in |
| Weight | 3.6 lb | 4.1 lb |
| Warranty | 2 years | 2 years |