Frequently Asked Questions
What is the Crown 6CRV390 battery?
The Crown 6CRV390 is a 6VDC deep cycle AGM battery rated at 390Ah at the 20-hour rate. It is designed for applications that require repeated cycling and dependable energy storage, including off-grid solar systems, renewable energy storage, backup power, RVs, marine equipment, and industrial applications.
Is the Crown 6CRV390 a good battery for solar applications?
Yes. The Crown 6CRV390 is well suited to solar energy storage where a sealed, maintenance-free AGM battery is preferred. Its 390Ah capacity provides substantial storage for larger battery banks, while the AGM construction removes the need for routine watering.
How much energy does the Crown 6CRV390 store?
The Crown 6CRV390 is rated at 390Ah at the 20-hour rate and 6VDC. Actual usable energy will vary depending on discharge rate, depth of discharge, temperature, battery age, and system design.
How many Crown 6CRV390 batteries are needed for a solar battery bank?
The number depends on the required system voltage, daily energy consumption, desired backup time, allowable depth of discharge, and inverter requirements. Because each battery is 6VDC:
- 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 parallel strings can increase the total amp-hour capacity. Battery-bank sizing should be based on the complete solar system rather than amp-hour capacity alone.
What type of inverter is compatible with the Crown 6CRV390?
The Crown 6CRV390 can be used with an inverter designed for the voltage of the complete battery bank. Because the 6CRV390 is a 6VDC battery, multiple batteries are normally connected in series to match 12VDC, 24VDC, or 48VDC system requirements. The inverter and battery bank should be properly sized for the expected loads and discharge requirements.
The 6CRV390 uses the BCI Group 903 configuration. Always verify the available installation space, cable routing, and clearance before installing the battery.
Charging & Maintenance
How should the Crown 6CRV390 be charged in a solar system?
The 6CRV390 should be charged with a solar charge controller that supports AGM batteries and uses the charging profile recommended for the battery. Correct charging is important because both undercharging and overcharging can reduce AGM battery life. A temperature-compensated charging system can also help maintain appropriate charging voltage as operating temperatures change.
Does the Crown 6CRV390 require watering?
No. The 6CRV390 is an AGM battery, so it does not require the routine electrolyte watering associated with flooded lead acid batteries. This makes it useful for solar installations where regular battery access is difficult.
Can the Crown 6CRV390 be used in a battery enclosure?
Yes, provided the installation follows Crown's safety and charging requirements and provides appropriate environmental conditions. AGM batteries have very low maintenance requirements, but proper charging, temperature control, electrical protection, and safe installation are still important.
Can the Crown 6CRV390 be installed on its side?
AGM batteries can generally be positioned in different orientations because the electrolyte is held within the absorbent glass mat rather than freely moving inside the case. However, the installation should follow Crown's positioning and safety guidance and should allow safe access to the battery connections.
What happens if the Crown 6CRV390 is repeatedly discharged too deeply?
Repeated deep discharges can shorten battery life and reduce long-term reliability. Crown recommends avoiding unnecessary deep discharges of AGM batteries, with approximately 50% depth of discharge commonly used as a practical target when prioritizing battery life. Proper battery-bank sizing can help reduce excessive cycling.
How should the Crown 6CRV390 be stored when it is not being used?
Store the battery fully charged in a cool, dry environment and disconnect it from equipment that could continue drawing power. AGM batteries should be checked periodically during extended storage and recharged as necessary to prevent prolonged low state-of-charge conditions.
Crown Battery Comparison
What is the difference between the Crown 6CRV330 and 6CRV390?
The Crown 6CRV330 and 6CRV390 are both 6VDC maintenance-free AGM deep cycle batteries. The 6CRV390 provides 390Ah compared with 330Ah for the 6CRV330 and has a higher rated storage capacity. The 6CRV390 is the better choice when greater energy storage is needed and the additional height and weight can be accommodated.
|
Specification
|
6CRV330
|
6CRV390
|
|
Voltage
|
6VDC
|
6VDC
|
|
Capacity (20 Hr)
|
330Ah
|
390Ah
|
|
Dimensions
|
11.62 x 7.01 x 14.59 in (29.5 x 17.8 x 37.1 cm)
|
11.62 x 7.01 x 16.75 in (29.5 x 17.8 x 42.5 cm)
|
|
Weight
|
103 lbs (46.7 kg)
|
127 lbs (57.5 kg)
|
|
Terminal Type
|
Dual post/Stud combination
|
Dual post/Stud combination
|
How does the Crown 6CRV390 compare with the 6CRV400?
The Crown 6CRV390 and 6CRV400 are both 6VDC maintenance-free AGM batteries designed for deep cycle applications. The 6CRV400 provides 400Ah compared with 390Ah for the 6CRV390 and has a slightly higher rated storage capacity. The 6CRV390 can be a practical choice when its 390Ah capacity meets the system requirement without moving to the slightly higher-capacity model.
|
Specification
|
6CRV390
|
6CRV400
|
|
Voltage
|
6VDC
|
6VDC
|
|
Capacity (20 Hr)
|
390Ah
|
400Ah
|
|
Dimensions
|
11.62 x 7.01 x 16.75 in (29.5 x 17.8 x 42.5 cm)
|
11.62 x 7.01 x 16.75 in (29.5 x 17.8 x 42.5 cm)
|
|
Weight
|
127 lbs (57.5 kg)
|
127 lbs (57.5 kg)
|
|
Terminal Type
|
Dual post/Stud combination
|
Dual post/Stud combination
|
Solar Application & Battery Life
What type of solar system is the Crown 6CRV390 best suited for?
The 6CRV390 is best suited for larger off-grid and backup solar systems that need substantial energy storage and benefit from the low-maintenance characteristics of AGM technology. Its 6VDC configuration is particularly useful when multiple batteries are connected in series to reach the required system voltage.
How does temperature affect the Crown 6CRV390 in a solar installation?
Battery temperature affects charging and overall battery performance. High temperatures can accelerate battery aging, while very low temperatures can reduce available performance. A properly designed solar charging system with appropriate temperature compensation can help protect the battery under changing environmental conditions.
Can the Crown 6CRV390 be used for backup power as well as solar?
Yes. Its deep cycle design makes it suitable for backup and renewable energy storage applications in addition to off-grid solar. It can also be used in RV, marine, and other equipment where substantial deep-cycle energy storage is required.
How can I maximize the service life of the Crown 6CRV390?
Use a charger or solar charge controller designed for AGM batteries, avoid prolonged low states of charge, limit unnecessary deep discharges, maintain clean and secure connections, and protect the battery from excessive heat. Proper system sizing is also important because consistently overworking the battery can reduce its useful life.
What should I check if my Crown 6CRV390 is not holding a charge?
First check the charging equipment, wiring, connections, battery-bank configuration, and system loads. The battery should be fully charged before evaluating its resting voltage or conducting a load test. Crown notes that a healthy fully charged 6V battery should read approximately 6.4V or higher after charging. If the battery continues to lose charge unusually quickly, professional battery testing can help determine whether the problem is the battery or another part of the system.
Read Less