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The Newmar PT-25W is a Phase Three series battery charger for 12-volt systems on workboats, commercial and military vessels and recreational craft. It delivers up to 25 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 temperature 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 50–250 Ah.
The AC input accepts 90–132 or 180–264 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-25W 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 12 V and fall within the 50–250 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-25W is an installed 12 V marine charger. Check these six points before you buy.
The PT-25W charges 12 V batteries only. Newmar makes 24 V Phase Three models separately.
Newmar recommends 50–250 Ah of battery capacity for this model.
Wire each bank to its own output. Total output is 25 A.
Use the selector switch for gel-cell, flooded lead-acid or AGM.
The input accepts 90–132 or 180–264 VAC. Protect the circuit to suit.
The TCS-12/24 temperature 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-14W (14 A) or the PT-40U (40 A) for other 12 V output levels, or the PT-24-20U for a 24 V system.
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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