Crown CR-370 370Ah 6VDC Deep Cycle Flooded Lead Acid Battery

Frequently Asked Questions

What is the Crown CR-370 battery?
The Crown CR-370 is a 6VDC deep cycle flooded lead acid battery rated at 370Ah at the 20-hour rate. It is designed for repeated charge and discharge applications including solar energy storage, renewable energy systems, backup power, RVs, marine equipment, electric vehicles, floor machines, and industrial equipment.

Is the Crown CR-370 suitable for solar energy storage?
Yes. The Crown CR-370 is designed for deep cycle applications and can be used in off-grid solar systems, renewable energy storage, and grid-tied systems with battery backup. It is best suited to installations where flooded lead acid battery maintenance can be performed regularly.

How much energy does the Crown CR-370 store?
The Crown CR-370 is rated at 370Ah at the 20-hour rate and provides approximately 2.15 kWh of rated energy storage at that rate. Actual usable energy depends on discharge rate, depth of discharge, temperature, battery condition, and system operating conditions.

How should Crown CR-370 batteries be connected for a solar battery bank?
Because the Crown CR-370 is a 6VDC battery, common series configurations include:

• Two Crown CR-370 batteries in series for a 12VDC battery bank
• Four Crown CR-370 batteries in series for a 24VDC battery bank
• Eight Crown CR-370 batteries in series for a 48VDC battery bank

Additional parallel strings can be used when more amp-hour capacity is required. Battery-bank sizing should consider daily energy consumption, solar production, inverter loads, backup requirements, and allowable depth of discharge.

Charging & Maintenance

How should the Crown CR-370 be charged in a solar system?
Use a solar charge controller configured for flooded lead acid batteries and follow Crown's recommended charging requirements for the specific installation. The charging equipment must be compatible with the complete battery-bank voltage. Avoid chronic undercharging and unnecessary overcharging because improper charging can reduce battery performance and service life.

Does the Crown CR-370 require watering?
Yes. The Crown CR-370 is a flooded lead acid battery and requires periodic electrolyte inspection and watering. Use distilled or de-mineralized water and maintain the electrolyte at the proper level. Watering frequency depends on charging practices, cycling, temperature, and battery age.

How often should I inspect the Crown CR-370 battery?
Establish a regular inspection schedule based on the operating conditions. Crown recommends checking new flooded batteries approximately every two weeks to establish a baseline. More frequent inspections may be necessary in hot environments or systems with heavy cycling.

Can I use tap water in the Crown CR-370?
No. Use distilled or de-mineralized water when servicing the battery. Minerals and impurities found in ordinary tap water can contaminate the electrolyte and negatively affect battery performance and service life.

Does the Crown CR-370 require ventilation?
Yes. Flooded lead acid batteries can produce hydrogen gas during charging. Install the Crown CR-370 in a properly ventilated location and keep it away from sparks, flames, cigarettes, and other ignition sources.

Crown Battery Comparison

How does the Crown CR-370 compare with the Crown CR-350?
The Crown CR-370 and Crown CR-350 are both 6VDC deep cycle flooded lead acid batteries, but they use different BCI group sizes. The Crown CR-370 is a Group 903 battery rated at 370Ah, while the Crown CR-350 is a Group 902 battery rated at 350Ah. The Crown CR-370 provides approximately 2.15 kWh of rated 20-hour energy storage compared with 2.04 kWh for the Crown CR-350, but it is also larger and heavier.

What is the difference between the Crown CR-370 and Crown CR-390?
The Crown CR-370 and Crown CR-390 are both 6VDC Group 903 deep cycle flooded lead acid batteries with the same listed dimensions. The Crown CR-390 provides 390Ah compared with 370Ah for the Crown CR-370, increasing rated 20-hour energy storage from approximately 2.15 kWh to 2.27 kWh. The Crown CR-370 is lighter, while the Crown CR-390 is better suited when additional capacity is the priority within the same battery footprint.

Solar Application & Battery Life

How deeply should the Crown CR-370 be discharged in a solar system?
For regular solar cycling, avoiding unnecessary deep discharges can help extend battery life. A properly sized battery bank can reduce the need for excessive daily discharge and provide additional capacity for periods of low solar production.

How long can the Crown CR-370 last in a solar application?
There is no single lifespan that applies to every Crown CR-370 installation. Service life depends on depth of discharge, charging, temperature, watering, maintenance, cycling frequency, and other operating conditions. Shallower cycling and proper battery maintenance can help support longer service life.

How does temperature affect the Crown CR-370?
Temperature affects flooded lead acid battery performance and service life. Cold conditions can reduce available capacity, while prolonged exposure to high temperatures can accelerate battery aging. Proper ventilation and temperature management are important in solar battery installations.

Can the Crown CR-370 be used for backup power and other applications?
Yes. In addition to solar energy storage, the Crown CR-370 can be used in applications requiring repeated charge and discharge cycles, including backup power, RVs, marine systems, electric vehicles, floor machines, and industrial equipment. The battery-bank voltage and capacity should be matched to the requirements of the specific application.

Is the Crown CR-370 maintenance free?
No. The Crown CR-370 is a flooded lead acid battery and requires periodic electrolyte inspection and watering. Customers who want less routine maintenance may consider AGM or another sealed battery technology, but the replacement must be compatible with the solar system's charging equipment, voltage, and operating requirements.