A popular 40 A controller for 12/24 V RV and cabin systems with up to about 520 W of panels. Budget for the BT-2 module if you want app monitoring.
Amazon $159.99The Renogy Rover 40A rates 4.0 among MPPT solar charge controllers; the LiTime 12V 40A DC-DC Charger rates 3.5 among DC-DC ones. The LiTime 12V 40A DC-DC Charger costs $4 less ($155.99 vs $159.99).

A bare-bones, low-cost alternator charger for a lithium house battery in an RV or van. Spend more for smart-alternator details, monitoring or a solar input.
Amazon $155.99Prices 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 | Renogy Rover 40A | LiTime 12V 40A DC-DC Charger |
|---|---|---|
| Overall rating | 4.0/5 | 3.5/5 |
| Value 35% | 80 $4 per amp of charge current | 92 $3.90 per amp of charge current |
| Features 25% | 69 Bluetooth add-on, lithium profile, temperature sensor; 100 V PV limit | 35 lithium profile; no Bluetooth |
| Efficiency 20% | 75 98% peak efficiency (maker rating) | 50 efficiency not published (neutral score used) |
| Warranty 20% | 50 3-year warranty | 25 2-year warranty |
Specifications
| Renogy Rover 40A | LiTime 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 | - | No |
| Temperature sensor | Included | No |
| Peak efficiency | 98% | - |
| Standby draw | 100 mA | - |
| Inputs | ||
| Max PV voltage (Voc) | 100 V | - |
| Max PV power (12 V) | 520 W | - |
| Isolated | - | Yes |
| Monitoring and build | ||
| Bluetooth | Optional add-on | No |
| Display | Yes | No |
| Load output | - | No |
| Water resistance | IP32 | - |
| Dimensions | 9.38 x 6.78 x 3.05 in | - |
| Warranty | 3 years | 2 years |