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The Newmar PT-24-45U is a Phase Three series battery charger for 24-volt systems on workboats, commercial and military vessels and recreational craft. It delivers up to 45 A across 3 output banks, isolated so each battery charges independently, with an ammeter showing total output current. It is a standalone charger, not an inverter.
Smart circuitry runs a three-stage charge of bulk, absorption and float, and a selector switch sets the output for gel-cell, flooded lead-acid or AGM batteries. An optional TCS-12/24 sensor adjusts the voltage to battery temperature, and the optional RP remote panel shows the charge stage and lets you restart the charge cycle. Newmar recommends a battery capacity of 90–450 Ah.
The AC input accepts 90–264 VAC, 50–60 Hz, so the charger runs on 115 V or 230 V shore power. A stainless steel case with a white powder coat, polyurethane-coated circuitry, current limiting, thermal protection and forced-air cooling suit marine conditions, and an optional drip shield is available. The charger can also act as a regulated DC power supply.
This listing is for one Newmar PT-24-45U battery charger. The shipping options and delivery estimate for your address appear at checkout. Our full terms are on the shipping policy page: https://marinerswarehouse.com/policies/shipping-policy
Before installation, confirm your batteries are 24 V and fall within the 90–450 Ah range. Mount the charger in a ventilated location, add the drip shield where water may fall on it, and size the AC and DC wiring and fusing per the Newmar manual.
Review the 16 oz gel format, specifications and application directions.
Check fiberglass, gelcoat and finish suitability before use.
Ask about your surface and stain type before ordering.
Review shipping information and return conditions before purchase.
Installation & Compatibility Guides
The Newmar PT-24-45U is an installed 24 V marine charger. Check these six points before you buy.
The PT-24-45U charges 24 V batteries only. Newmar makes 12 V Phase Three models separately.
Newmar recommends 90–450 Ah of battery capacity for this model.
Wire each bank to its own output. Total output is 45 A.
Use the selector switch for gel-cell, flooded lead-acid or AGM.
The input accepts 90–264 VAC. Protect the circuit to suit.
The TCS-12/24 sensor, RP remote panel and drip shield are sold separately.
A battery charger only recharges batteries from shore or generator power. An inverter/charger adds AC output from the battery and an automatic transfer switch. The Phase Three series is a dedicated marine charger for systems that already have an inverter or do not need one.
Compare the PT-24-13W (13 A), the PT-24-20U (20 A) for other 24 V output levels in this collection.
Use these collections to compare inverter/chargers, inverters and other RV and marine equipment. A collection link is for browsing and does not confirm compatibility.
Compare battery chargers and combined inverter/chargers by charge current, battery voltage and number of outputs.
Browse standalone inverters if you also need AC power from the battery. This link does not establish a compatible pairing.
Return to the parent collection to find another product family for your RV, vehicle or boat project.
Need Help?
Want help choosing a Phase Three charger size? Send us your battery voltage, banks and capacities, and our team will help you check the fit.
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