Crown 27HDC 115Ah 12VDC Heavy Duty Commercial Deep Cycle Flooded Lead Acid Battery

Frequently Asked Questions

What is the Crown 27HDC battery?
The Crown 27HDC is a 12VDC commercial deep cycle flooded lead acid battery with a rated capacity of 115Ah at the 20-hour rate. It is built for applications that require sustained power and repeated charge and discharge cycles, including solar energy storage, RVs, marine equipment, and other deep cycle applications.

Is the Crown 27HDC suitable for solar power systems?
Yes. The Crown 27HDC is suitable for solar applications that use flooded lead acid battery banks. It can be used in off-grid PV systems and other renewable energy systems where the battery can be properly charged, ventilated, inspected, and maintained.

How much energy can the Crown 27HDC store?
The Crown 27HDC is rated at 115Ah at the 20-hour rate and provides 0.67 kWh of rated storage at that rate. Actual energy available to a solar system will vary based on discharge rate, battery condition, temperature, charging, system losses, and the depth of discharge used.

What does Group 27 mean for the Crown 27HDC?
Group 27 refers to the BCI battery group size and identifies the battery's general physical format. The Group 27 classification helps customers compare battery fitment and available space, but it does not by itself indicate the battery's capacity or performance.

Can the Crown 27HDC be used in a 24VDC or 48VDC solar battery bank?
Yes. Because the Crown 27HDC is a 12VDC battery, multiple batteries can be connected in series to increase system voltage.

• Two Crown 27HDC batteries in series create a 24VDC battery bank.
• Four Crown 27HDC batteries in series create a 48VDC battery bank.

Additional parallel strings can be used when more amp-hour capacity is required, provided the complete battery bank, cabling, protection, charging equipment, and installation are properly designed.

Charging & Maintenance

What type of charger should be used with the Crown 27HDC?
The Crown 27HDC should be charged with equipment designed for flooded lead acid batteries. In a solar system, the charge controller should use a charging profile appropriate for a 12VDC flooded battery and should be correctly matched to the complete battery bank configuration.

Does the Crown 27HDC require regular watering?
Yes. The Crown 27HDC is a flooded lead acid battery, so its electrolyte level needs to be checked periodically and water added when required. Crown recommends using distilled water and following the battery's service instructions.

When should water be added to the Crown 27HDC?
Water levels should be checked before charging, but the battery should normally be watered after it has been completely charged. Before charging, add only enough water to cover exposed plates if necessary. After charging, bring the electrolyte to the proper level without overfilling.

Can tap water be used in the Crown 27HDC?
No. Distilled water should be used for routine watering. Minerals and impurities found in tap water can contaminate the electrolyte and negatively affect battery performance and service life.

What maintenance should be performed on a Crown 27HDC solar battery?
Regular maintenance should include checking the electrolyte level, inspecting the battery case and vent caps, keeping the battery and terminals clean and dry, checking cable connections, and monitoring battery condition and charging performance. Because the Crown 27HDC is a flooded battery, good ventilation is also important during charging and operation.

Crown Battery Comparison

How does the Crown 27HDC compare with the Crown 24HDC?
The Crown 27HDC provides higher capacity than the Crown 24HDC while both are 12VDC flooded deep cycle batteries. The Crown 27HDC offers 115Ah at the 20-hour rate compared with 90Ah for the Crown 24HDC, making it the better choice when additional storage is needed and the Group 27 format fits the installation.

Is the Crown 27HDC a better choice than the Crown 31HDC for solar?
The Crown 27HDC and Crown 31HDC are both 12VDC flooded deep cycle batteries, but the Crown 31HDC provides higher capacity at 130Ah compared with 115Ah for the Crown 27HDC. The Crown 27HDC is more compact in length and lighter, while the Crown 31HDC can provide more rated energy when the larger battery format is acceptable.

Solar Application & Battery Life

How deeply should the Crown 27HDC be discharged in a solar system?
Although a deep cycle battery can be discharged substantially, routinely using very deep discharges can reduce service life. For solar applications, it is generally better to size the battery bank with enough capacity to avoid unnecessary deep daily discharges. Crown notes that reducing depth of discharge can increase cycle life.

How long can a Crown 27HDC last in a solar application?
There is no single service-life figure that applies to every Crown 27HDC installation. Battery life depends on depth of discharge, charging quality, temperature, maintenance, storage conditions, cycling frequency, and other operating factors. Proper charging and regular maintenance are important for getting the expected service life from a flooded deep cycle battery.

Does the Crown 27HDC need ventilation when used with solar?
Yes. The Crown 27HDC is a flooded lead acid battery and can generate hydrogen gas during charging. Install and charge the battery in a properly ventilated area and keep sparks, flames, cigarettes, and other ignition sources away from the battery.

Can the Crown 27HDC be stored for an extended period?
Yes, but it should be stored fully charged and checked periodically. Crown recommends avoiding long-term storage in a discharged condition because sulfation can damage lead acid battery plates. For flooded batteries, electrolyte levels should also be checked and maintained appropriately before and after storage.

What should I check if the Crown 27HDC is losing capacity in my solar system?
Begin by checking whether the battery is receiving a complete charge and whether the charge controller is configured correctly for flooded lead acid batteries. Also inspect electrolyte levels, terminal connections, corrosion, operating temperature, and the depth of discharge used by the system. If performance remains poor after these checks, the battery may require professional testing.