Thank you for your interest in Rolls Deep Cycle Marine Batteries the number 1 choice for over 40 years of the professional seamen who ply the North Atlantic. Rolls offers a superior battery for almost every marine application. Don't be fooled by imitators who apply a "marine" or "deep cycle" label to automotive batteries. An automotive battery, which is designed to release energy for short periods of time when starting an engine, does not have the designed construction required to perform the deep cycling service for which Rolls is the bench mark in the battery industry.
Positive plate design and construction are the # 1 factor limiting battery life
Deep discharging and recharging causes the active material to loosen and fall to the bottom of the case shorting out the cell. Roll's massive plate grids, special high-density active material, heavy fiberglass separators and micro-porous polyethylene enveloped plates minimize plate material shedding. . The envelopes retain the shed material and prevent it from falling and shorting out the cells greatly extending battery life. Now there is no "mud space" so the plates are supported on the bottom of the case and not merely hanging from the top for far greater mechanical stability and increased electrolyte reserve over the plates allowing less frequent watering. This premium construction allows Rolls to offer the longest warranties in the industry, sure they initially cost more than other "marine" or "deep cycle" batteries but their extended life and superior cycling service make them the least expensive in the long run. There are no service stations at sea, battery failure and frequent replacement can be annoying enough on land, at sea, it may be the beginning of disaster.
Yes the initial price is higher than other "marine" or "deep cycle", batteries but if you are replacing batteries every two to three years they actually cost less than the "less expensive" models. Roll's Warranty of two years unconditional replacement and an additional five pro-rated years, is unmatched in the battery industry. Many customers report 10-12 year and even longer life.
For deep cycle applications where battery compartment space is limited to group 27 size we recommend the 27 HT 90, For smaller boats, which are limited to group 24, the choice is the 24 HT 80. These batteries are the only true deep cycle in these sizes available anywhere. Other so called " deep cycle" or "marine batteries" are often only starting batteries with a label and rope handles on them.
Determining the right battery for you
If you have a larger boat, more electrical demand and larger battery compartment, many options are available, including the "BIG RED" 275 Ampere Hour 8D 12 volt, T12-136 12 volt and several models in the middle size ranges with amp hour ratings from 108 to 250. Often, two six-volt batteries will give greater capacity and more portability in approximately the same space as a single 12-volt. The six volts come in sizes from 105 up to 820 Amp. Hr. For larger vessels with heavy electrical usage we recommend the New Generation 5000 Series with Dual Unbreakable Leak-proof Case, Replaceable Cells and 10 year warranty
We suggest you measure your battery compartment capacity, length, width and height, and estimate your 24-hour ampere-hour usage and multiply the total ampere-hour usage by at least three. Remember, to maximize longevity, a battery should not be discharged more than 50% before recharge. The resultant total will be your recommended battery bank capacity. For example, if you use 50 amp hours per day you should have a battery capacity of 150-ampere hours. If you have a 12-volt to 110-volt inverter, you need a minimum of 100 amp hours for each 500 watts of inverter output. (e.g. 2000 watt inverter requires 400 amp hr battery bank).
As you can see it adds up quickly and your total daily use is far greater than you suspect. Battery requirements must be determined accordingly and only the best deep cycles will give year in and year out performance in this demanding service. Automotive Batteries with "Marine" or "Deep Cycle" labels will not. Only Rolls Engineering can deliver this kind of performance and longevity.
When you have determined the battery size, which you think meets your needs, or, if you need help in choosing the right battery, call for a recommendation: 800.487.0610
CAUTION: Because of the severe conditions to which they may be subjected, Rolls solar batteries are not suitable for marine RV or mobile applications. Rolls Battery Engineering and/or Surrette Battery Co. Ltd. will not honor warranties on batteries purchased from Solar distributor/dealers if so used