Crown CR-205 205Ah 6VDC Deep Cycle Flooded Lead Acid Battery

Frequently Asked Questions

What is the Crown CR-205 battery?
The Crown CR-205 is a 6VDC deep cycle flooded lead acid battery rated at 205Ah at the 20-hour rate. It is designed for repeated charge and discharge cycles and can be used in solar energy storage, RVs, marine equipment, golf carts, backup power systems, and other deep cycle applications.

Is the Crown CR-205 a good battery for solar?
Yes. The Crown CR-205 is well suited for off-grid solar and other renewable energy systems that use flooded lead acid battery banks. Its 6VDC configuration also makes it useful for assembling higher-voltage battery banks in series.

How much energy does the Crown CR-205 store?
The Crown CR-205 is rated at 205Ah at the 20-hour rate. Crown lists 1.19 kWh of rated storage at the 20-hour rate. Actual usable energy will vary depending on discharge rate, temperature, battery age, depth of discharge, and the design of the solar system.

How many Crown CR-205 batteries do I need for a solar system?
The number of batteries depends on the required system voltage, daily energy consumption, backup time, and allowable depth of discharge. Common series configurations include:

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

Additional batteries can be connected in parallel to increase total amp-hour capacity. Battery-bank sizing should also account for solar production, inverter requirements, and expected loads.

Charging & Maintenance

How should the Crown CR-205 be charged in a solar system?
The Crown CR-205 should be charged with a solar charge controller configured for a flooded lead acid battery. The controller should follow Crown's recommended charging requirements for the specific installation. Correct charging is important because chronic undercharging can contribute to sulfation, while excessive charging can increase water loss and battery wear.

Does the Crown CR-205 require watering?
Yes. The CR-205 is a flooded lead acid battery and requires periodic electrolyte inspection and watering. Use only distilled or de-mineralized water and maintain the electrolyte at the proper level. Follow Crown's battery maintenance instructions when checking and adding water.

How often should I check the water level in the Crown CR-205?
The required inspection interval depends on charging voltage, cycling frequency, temperature, battery age, and operating conditions. Crown recommends regular inspection of flooded batteries, with approximately two-week intervals commonly used for new batteries to establish a maintenance baseline. Inspection frequency may need to increase as the battery ages or operating conditions change.

Can I use tap water in the Crown CR-205?
No. Use distilled or de-mineralized water. Minerals and other impurities found in tap water can contaminate the electrolyte and negatively affect battery performance and service life.

Crown Battery Comparison

What is the difference between the Crown CR-205 and Crown CR-220?
The Crown CR-220 and CR-205 are both 6VDC GC2 deep cycle flooded lead acid batteries. The Crown CR-220 provides 220Ah at the 20-hour rate compared with 205Ah for the Crown CR-205, giving it more rated energy storage. Both batteries have the same listed dimensions, while the Crown CR-220 is slightly heavier. The Crown CR-205 may be the better choice when 205Ah meets the system's requirements, while the Crown CR-220 provides additional capacity within the same general footprint.

What is the difference between the Crown CR-205 and Crown CR-235?
The Crown CR-235 has a higher 20-hour capacity than the Crown CR-205, while both are 6VDC GC2 deep cycle flooded lead acid batteries. The Crown CR-235 provides more rated energy storage in the same general GC2 form factor. The Crown CR-205 is lighter and can be a practical choice when 205Ah capacity is sufficient for the solar application.

Solar Application & Battery Life

How deeply should I discharge the Crown CR-205 in a solar system?
Avoiding unnecessary deep discharges can help extend flooded lead acid battery life. A solar battery bank should be sized with enough capacity to handle normal loads without routinely reaching a very low state of charge. Shallower discharge cycles generally place less stress on the battery than repeated full discharges.

How long will a Crown CR-205 last in a solar system?
There is no single service-life number that applies to every installation. Actual life depends on depth of discharge, charging practices, temperature, watering, cycling frequency, storage conditions, and maintenance. Proper charging and avoiding unnecessary deep discharge can help maximize service life.

Does the Crown CR-205 need ventilation?
Yes. The Crown CR-205 is a flooded lead acid battery and can produce hydrogen gas during charging. It should be installed upright in a properly ventilated location and kept away from sparks, flames, cigarettes, and other ignition sources. Follow applicable battery and electrical installation requirements.

Can the Crown CR-205 be installed on its side?
No. Because the Crown CR-205 contains liquid electrolyte, it should be installed and operated in an upright position. Upright installation also allows proper inspection, watering, and maintenance.

What should I check if my Crown CR-205 is not performing as expected?
Start by checking the solar charge controller settings, battery connections, terminals, electrolyte level, and overall battery condition. Confirm that the battery is receiving an appropriate charge before evaluating its capacity. Poor performance can be related to undercharging, excessive discharge, sulfation, low electrolyte, high temperature, poor connections, or normal battery aging.