Projecta IDC25 Intelli-Charge DC to DC Charger
Modern vehicles with smart alternators have made basic split-charge systems unreliable, which is exactly the problem DC-DC chargers like the IDC25 were built to solve — a proper multi-stage charger that manages the auxiliary battery regardless of what the vehicle's alternator is doing.
Key features
- 25A output across an 11–32V input range, or 20A at 9–11V input
- Integrated MPPT solar input, accepting up to 28V/25A from a solar panel
- 3-stage charging profile suited to wet, calcium, AGM and gel batteries in 75–300Ah banks
- IP67-rated housing
- Maintains full charge output up to 75°C ambient, and continues operating to 90°C
RV use case
This suits owners who've either upgraded to a smart-alternator tow vehicle or simply want a properly regulated charge to their auxiliary battery rather than relying on a basic relay-based system. The built-in solar input is a genuine convenience for smaller setups — it means one unit handles both the driving-charge and solar-charge duties without needing a completely separate MPPT controller wired in alongside it.
Pros
- Works properly with smart-alternator vehicles where basic isolators fall short
- Combining DC-DC and solar charging into one unit simplifies smaller installations
- High-temperature tolerance suits underbonnet or exposed mounting positions
Cons
- 25A output is modest for larger lithium banks wanting faster bulk charging
- Solar input capacity is limited compared with a dedicated higher-output MPPT controller
- Best suited to lead-acid/AGM chemistries rather than the highest-output lithium charging profiles
Best for
Owners with modern tow vehicles using smart charging systems, or anyone wanting a single unit to manage both alternator and solar charging in a modest-sized setup.
Verdict
It's a sensible, well-rated charger for the vehicles it's designed around — particularly where a basic isolator has already proven unreliable against a smart alternator. Just be realistic about output if you're running a larger lithium bank.
Projecta IDC25 Intelli-Charge DC to DC Charger
Close-up of the app and Intelli-IQ display showing live charge status
Close-up of the charger unit and heatsink fins
Included components and wiring accessories