Crown CR-250 250Ah 6VDC Deep Cycle Flooded Lead Acid Battery

Frequently Asked Questions

Is the Crown CR-250 suitable for an off-grid solar system?
Yes. The Crown CR-250 is a 6VDC flooded deep cycle battery designed for applications that repeatedly charge and discharge the battery. It can be used in off-grid solar and renewable energy systems when the battery bank, charge controller, inverter, and charging settings are properly matched.

How much energy can the Crown CR-250 store?
The Crown CR-250 is rated at 250Ah at the 20-hour rate and provides 1.46 kWh of rated energy at the 20-hour rate. Crown also lists 1.63 kWh at the 100-hour rate. Actual usable energy will vary based on discharge rate, depth of discharge, temperature, battery condition, and system efficiency.

How many Crown CR-250 batteries are needed for a 12V, 24V, or 48V solar system?
The Crown CR-250 is a 6VDC battery, so batteries can be connected in series to reach common system voltages:

• Two batteries in series create a 12VDC battery bank.
• Four batteries in series create a 24VDC battery bank.
• Eight batteries in series create a 48VDC battery bank.

Additional matched series strings can be connected in parallel when more amp-hour capacity is required. The correct battery-bank size depends on daily energy consumption, backup requirements, solar production, inverter load, and allowable depth of discharge.

What does the 250Ah rating of the Crown CR-250 mean?
The 250Ah rating is the battery's amp-hour capacity measured at Crown's 20-hour rate. It does not mean the battery will deliver 250 amps for one hour. Capacity changes with discharge rate, which is why Crown also provides a 5-hour rating of 215Ah.

What are the dimensions and weight of the Crown CR-250?
The Crown CR-250 measures:

• Length: 11.75 inches (29.8 cm)
• Width: 7.19 inches (18.3 cm)
• Height: 11.13 inches (28.3 cm)
• Weight: 76 lbs (34.5 kg)

Always verify the available battery compartment, terminal clearance, and access for maintenance before installation.

Charging & Maintenance

How should the Crown CR-250 be charged in a solar system?
Use a solar charge controller designed for flooded lead acid batteries and configure it according to Crown's charging requirements for the application. Correct charging is important because both prolonged undercharging and excessive charging can reduce battery performance and service life.

Does the Crown CR-250 require regular maintenance?
Yes. The Crown CR-250 is a flooded lead acid battery and requires periodic inspection and electrolyte maintenance. Battery condition, electrolyte level, terminal connections, and the surrounding area should be checked as part of a regular maintenance routine.

What type of water should be used in a Crown CR-250?
Use distilled or de-mineralized water when electrolyte levels require topping up. Do not use ordinary tap water because minerals and impurities can affect the electrolyte and battery performance.

Does the Crown CR-250 need ventilation?
Yes. Flooded lead acid batteries can release hydrogen gas during charging. Install the Crown CR-250 in a properly ventilated location and keep it away from sparks, flames, cigarettes, and other ignition sources.

Can the Crown CR-250 be installed on its side?
No. Because the Crown CR-250 is a flooded lead acid battery containing liquid electrolyte, it should be installed and operated in an upright position.

Crown Battery Comparison

What is the difference between the Crown CR-240 and CR-250?
The Crown CR-240 and CR-250 are both 6VDC deep cycle flooded batteries, but the CR-250 provides 250Ah compared with 240Ah for the CR-240. The CR-250 also has a higher 5-hour capacity and the same 150-minute reserve capacity listed for the CR-240. The CR-240 uses a shorter GC2 form factor, while the CR-250 is longer and slightly taller. The CR-250 is a good choice when additional capacity is more important than maintaining the smaller GC2 footprint.

How does the Crown CR-250 compare with the Crown CR-260?
The Crown CR-260 provides 260Ah compared with 250Ah for the CR-250 and has a higher 5-hour capacity and greater reserve capacity. The CR-250 is shorter and lighter, while the CR-260 is taller and heavier. For a solar battery bank, the CR-250 may be preferable when its lower physical height and weight are useful, while the CR-260 provides more capacity when available space allows.

Solar Application & Battery Life

Is the Crown CR-250 a good choice for a large solar battery bank?
It can be a practical choice when a system requires a 6VDC flooded battery with 250Ah of rated capacity. Multiple Crown CR-250 batteries can be arranged in series to reach the required system voltage, with additional matched strings in parallel when greater capacity is needed.

How can I extend the service life of a Crown CR-250 in a solar system?
Proper charging, regular maintenance, suitable operating temperatures, adequate ventilation, and avoiding unnecessary deep discharges can help support longer battery service life. The battery should also be kept properly charged rather than left for extended periods in a partially charged condition.

Can Crown CR-250 batteries be connected in series and parallel?
Yes. Series connections increase battery-bank voltage, while properly matched parallel strings increase total amp-hour capacity. Batteries in the same bank should be appropriately matched, and the wiring should be sized for the expected charging and discharge current.

What should I inspect if a Crown CR-250 is losing capacity?
Check the charging system, battery connections, electrolyte level, terminal condition, and signs of physical damage. Persistent capacity loss may be related to undercharging, excessive discharge, sulfation, temperature, poor connections, maintenance issues, or battery age.

Is the Crown CR-250 maintenance-free?
No. The Crown CR-250 is a flooded lead acid battery and requires regular electrolyte inspection and watering. Customers who want a battery with less routine maintenance should consider whether a different battery technology is more appropriate for their solar installation.