Alternator in, perfect charge out.
On the move, your alternator is the biggest charger you own — but feeding it straight to a service battery cooks the bank and strains the alternator. The ND series sits between them, isolating the starter battery and converting raw alternator output into a correct 3-stage charge for AGM, Gel, flooded or lithium service banks.
No separate relay needed — the ND charges the service bank only when the engine runs, protecting the starter battery from discharge.
Selectable AGM, Gel, flooded and lithium programs with bulk/absorption/float stages bring any bank to 100% safely.
Input current caps at 34A/68A/100A by model, protecting the vehicle charging system under full load.
From 247mm wide and 1.8kg, with over-voltage, over-temperature and reverse-polarity protection for engine-bay-grade reliability.
| Models | ND1212-20 · ND1212-40 · ND1212-60 |
|---|---|
| Nominal output power | 250W / 500W / 750W |
| Nominal output current | 20A / 40A / 60A |
| Operating current range | 18–22A / 27–33A / 37–43A |
| Low-current mode | 10A / 20A / 30A |
| Float charge current | 3–5A / 3–5A / 4.5–7.5A |
| Quiescent current | <0.45A / <0.6A / <0.75A |
| Ripple voltage | <500mV rms |
| Charging mode | 3-stage (bulk / absorption / float) |
| Efficiency | >85% @14VDC, 30% load |
| Input nominal voltage | 12VDC (operating 10–16VDC) |
| Input current limiting | ≤34A / ≤68A / ≤100A |
| Battery compatibility | AGM, Flooded, Gel, Lithium |
| Protections | Over-voltage, over-temperature, reverse polarity |
| Dimensions | 247×215×85 / 294×215×85 / 344×215×85 mm |
| Net weight | 1.8 / 2.2 / 2.8 kg |
A relay dumps raw alternator voltage into the service battery — undercharged banks, boiled AGMs and alternator overload. The ND converter regulates input and output current and applies the correct 3-stage profile, which is why lithium banks require a DC-DC charger.
A 20A unit suits weekend campers with a single 100Ah battery; 40A fits family RVs and frequent travelers; 60A is for large banks or fast turnaround between trips. Rule of thumb: 0.2–0.3C of your lithium bank capacity.
Yes. The dedicated lithium profile with CC/CV stages charges LiFePO4 banks correctly, and the unit tolerates the low-standby draw lithium systems expect (<0.45A quiescent on the 20A model).
AC-DC Smart Charger — NQ / NS Series
LiFePO4 Battery Packs