A simple 30 A controller for a small 12 V LiFePO4 system that wants app monitoring without add-ons.
Amazon $144.99The LiTime 30A MPPT Bluetooth rates 3.7 among MPPT solar charge controllers; the LiTime 12V 40A DC-DC Charger rates 3.5 among DC-DC ones. The LiTime 30A MPPT Bluetooth costs $11 less ($144.99 vs $155.99).

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 | LiTime 30A MPPT Bluetooth | LiTime 12V 40A DC-DC Charger |
|---|---|---|
| Overall rating | 3.7/5 | 3.5/5 |
| Value 35% | 69 $4.83 per amp of charge current | 92 $3.90 per amp of charge current |
| Features 25% | 80 Bluetooth app, lithium profile, temperature sensor | 35 lithium profile; no Bluetooth |
| Efficiency 20% | 75 98% peak efficiency (maker rating) | 50 efficiency not published (neutral score used) |
| Warranty 20% | 25 2-year warranty | 25 2-year warranty |
Specifications
| LiTime 30A MPPT Bluetooth | LiTime 12V 40A DC-DC Charger | |
|---|---|---|
| Charging | ||
| Type | MPPT solar charge controller | DC-DC charger |
| Charge current | 30 A | 40 A |
| Battery voltage | 12/24 V | 12 V |
| Lithium profile | Yes | Yes |
| Custom profile | Yes | No |
| Temperature sensor | - | No |
| Peak efficiency | 98% | - |
| Inputs | ||
| Max PV power (12 V) | 450 W | - |
| Isolated | - | Yes |
| Monitoring and build | ||
| Bluetooth | Built in | No |
| Display | Yes | No |
| Load output | - | No |
| Cooling | passive | - |
| Warranty | 2 years | 2 years |