Ammeter

The Ammeter indicates the amount of current, measured in amps, that is being drawn by the battery. As a battery takes on a charge, it draws less current from the charger. Correspondingly, the meter will show less current being drawn by the battery. When the current stops decreasing, the battery is charged. The 4 amp charge rate may indicate some activity on the meter, although the meter does not have the resolution to display this low rate.

Voltmeter

The voltmeter indicates the voltage at the battery terminals. The charger need not be plugged into an AC outlet. The timer should be in the OFF position. Then connect the charger following the instructions in Sections 5 and 6. Observe the meter indication.

Keep in mind that this reading is only a battery voltage reading; a false surface charge may mislead you. We suggest that you turn on the headlights for a couple of minutes before you read the meter. Read it a few minutes after you have shut off the headlights. If the reading is less than 10.5 volts, the battery may be bad or the connection at the charger may be poor. If the reading is 10.5–12.5 volts, the battery is low – recharge it. If the reading is above 12.8 volts, the battery is charged.

Charge Rate Selector Switch

Use the Charge Rate selector switch to select the charge rate or engine starting setting you require.

• 4A Slow Charge Rate – For charging small batteries, such as those commonly used in garden tractors, snowmobiles and motorcycles.

•20A and 40A Fast and 70A Rapid Charge Rate – For charging automotive, marine and deep-cycle

batteries. Not intended for industrial applications.

• 350A Engine Start – Provides 350 amps for cranking an engine with a weak or run-down battery. Always use in combination with a battery.

11.OPERATING INSTRUCTIONS

Thermal Runaway

As a safety precaution, the charger automatically reduces the current if it detects that the battery may be getting too hot.

Charging

1.Ensure that all of the charger components are in place and in good working condition, including the plastic boots on the battery clips. Make sure the electrolyte (battery liquid) in each cell is at the correct level.

2.Set the charge rate switch and the timer to the OFF position.

3.Connect the battery following the precautions listed in Sections 5 and 6.

4.Connect the AC power following the precautions listed in Section 7.

5.Select the desired charge rate. NOTE: The 40 amp Manual rate is a manual mode and will overcharge a battery if permitted to operate for extended periods of time. Monitor the charging process often.

6.Turn the timer to 24H (Hold) or the selected charge time if using the 40 amp Manual Mode.

7.To disconnect the charger, reverse the procedure.

NOTE: This charger is equipped with a safe start feature. In the Automatic 4, 20 and 70 amp charge rates, it will not supply current to the battery clips until a battery is properly connected. Unlike traditional chargers, the clips will not spark if touched together. In the Manual 40 amp charge rate, the clips will spark if accidently touched together.

Automatic Charging Modes

Put the timer in the 24H (Hold) position when using the battery charger in one of the Automatic Modes (4, 20 or 70 amp), otherwise the timer will stop the charging process when the time expires regardless of whether it is complete or not. The CHARGED (green) LED will light when charging is complete and the charger goes into Maintain Mode. The charger will not shut off. For a battery with a starting voltage under 1 volt, use the Manual Mode (see Manual Charging section) first to pre-charge the battery for five minutes, to get additional voltage into the battery for the charger to analyze.

• 7 •

Page 6 Page 8
Page 7
Image 7
Schumacher PWI70300A owner manual Operating Instructions, Thermal Runaway, Automatic Charging Modes
Page 6 Page 8

PWI70300A specifications

The Schumacher PWI70300A is a versatile and powerful 7 Amp fully automatic battery maintainer and charger that has been designed to cater to the needs of both everyday drivers and automotive enthusiasts. This model stands out for its blend of advanced technology and user-friendly features, making it suitable for various battery types, including 6V and 12V lead-acid batteries.

One of the main features of the PWI70300A is its automatic multi-stage charging system. This technology helps in optimizing battery performance and lifespan by delivering the appropriate charge based on the battery's condition. It automatically switches from bulk charge to absorption and then to maintenance mode once the battery reaches full charge, ensuring that there is no overcharging, which can cause damage.

The lightweight and compact design of the PWI70300A enhances its portability, allowing users to easily carry it around or store it in tight spaces. Additionally, the unit comes equipped with a user-friendly LED indicator, which provides real-time feedback about the charging status. This feature simplifies the charging process, as users can easily gauge whether the battery is charging, fully charged, or requires attention.

Notably, the PWI70300A is designed with safety as a priority. It includes built-in protections against reverse polarity, short circuit, and over-temperature, which significantly reduces the risks associated with battery charging. This makes it an ideal choice for those who may not have extensive experience with battery maintenance.

The Schumacher PWI70300A also shines in its versatility, as it is compatible with a wide range of electrical vehicles, including cars, motorcycles, and ATVs. This makes it a valuable addition to the toolkit of any vehicle owner. The inclusion of clamps and ring terminals ensures flexible connectivity options, allowing users to choose the most convenient way to connect the charger.

In summary, the Schumacher PWI70300A is a robust and dependable battery maintainer and charger, ideal for anyone looking to extend the life of their batteries while still being easy to use. With its automatic charging capabilities, safety features, portability, and compatibility with various vehicles, it presents an excellent investment for maintaining battery health and performance. Whether for professional use or personal convenience, the Schumacher PWI70300A delivers on quality and reliability.
Top Page Image Contents