Suncoast Batteries
12V 20A DC to DC Battery Charger Dual Battery System MPPT
12V 20A DC to DC Battery Charger Dual Battery System MPPT
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20A DC-DC Battery Charger (12V) with MPPT – AGM & Lithium (LiFePO₄)
Keep your aux battery topped up—anywhere. This compact DC-DC charger pulls power from your vehicle’s alternator and from solar via a built-in MPPT regulator, so you arrive with more charge and less engine load. It supports AGM, Gel, Calcium, VRLA, Flooded and Lithium (LiFePO₄) batteries, works with modern smart alternators, and uses multi-stage charging to maximise battery life. A pulse-recovery routine helps revive deeply discharged batteries, while comprehensive protections keep your system safe on the rough stuff.
Key Features
Dual Input: charges from the vehicle alternator or from solar panels (built-in MPPT).
Smart Alternator Compatible: ACC/ignition wire control for correct cut-in/cut-out on modern vehicles, caravans and trailers.
Built-in MPPT: optimises solar harvest to reduce engine load and shorten charge times.
Pulse Charging Algorithm: selects optimal modes and helps recover deeply discharged batteries.
Multi-Stage Charging: bulk → absorption → float for efficiency and longer battery life.
Multi-Chemistry Support: AGM, Gel, Calcium, VRLA, Flooded & Lithium (LiFePO₄).
Comprehensive Protection: over-charge, short-circuit, over-temp/thermal load, solar input overload, input/output reverse-polarity.
Internal Temp Monitoring: protects electronics and improves reliability.
Detailed Specifications
| Type | Multi-Stage 12V DC-to-DC |
| Features | MPPT solar input, Smart-alternator compatible |
| Models | 20A / 30A / 40A |
| Suitable Battery Types | AGM, Gel, Lead Acid, Calcium, LiFePO₄ |
| Recommended Battery Range | 60–600Ah (20A) • 90–900Ah (30A) • 120–1200Ah (40A) |
| Inputs | Alternator/DC: 13–16V • Solar (MPPT): 16–25V |
| Output / Charging Voltage | 13.5–15.4V (stops charging when alternator/vehicle battery < 12.4V) |
| Max Output Current | 20A / 30A / 40A (by model) |
| Minimum Start Voltage | 2.0V (battery being charged) |
| Soft Start | Yes |
| Bulk Charge Voltage | AGM/Gel: 14.7V • Lead Acid: 14.4V • Calcium: 15.4V • LiFePO₄: 14.6V |
| Absorption | Constant voltage with automatic amperage control |
| Equalisation | Automatic |
| Float Voltage | 13.5V (AGM/Gel/Lead Acid/Calcium) |
| Float Current | 100mA |
Cable Gauge Guide (Minimum)
| Run Length | 20A Model | 30A Model | 40A Model |
|---|---|---|---|
| 0–1 m | 11 AWG | 8 AWG | 8 AWG |
| 1–5 m | 9 AWG | 6 AWG | 6 AWG |
| ≥ 5 m | 7 AWG | 4 AWG | 4 AWG |
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from 422 reviewsVery friendly and helpful.
Excellent service and great products.
Highly recommended
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Friendly helpful service and the mechanic explained what he was doing. Fair pricing and same day service to my home. Respectful communication and felt safe as a single Mum. Thank you and will definitely recommended. Kate.
Great service & delivery to my door
Excellent primary start battery for my 3.2lt Pajero diesel
Good experience overall. Competitive pricing, helpful staff and a strong range of battery and solar products. Would happily recommend them to others.
Reliable wholesaler with quality batteries and solar products. Orders were handled efficiently and everything was ready on time. Very easy to deal with.
Excellent customer service and solid product knowledge. They took the time to explain the options and helped me find the best battery for my requirements.
Really impressed with the range they offer. Picked up a battery quickly and the team made sure it was exactly what I needed. Friendly and professional service.
Great place for batteries and solar solutions. Staff were knowledgeable and helped me choose the right option for my setup. Good pricing and smooth service.
Good service
Good service and prompt delivery from this crew, will definitely use them again in the future
Good battery at a reasonable price.
David's attention to detail and his vast knowledge of vehicle maintenance made the installation of my new battery simple. I would thoroughly recommend this company.
Replaced my worn out battery with this one and it has been faultless. Would definitely buy again.
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