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Rv Toyhauler trailer battery upgrade and discussion
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<blockquote data-quote="Kapolani" data-source="post: 693172" data-attributes="member: 12584"><p>You're going to want a bigger battery bank than that.</p><p></p><p>Figure out how long each electronic device will be run in hours during a day. Multiply the wattage of each device by its run-time to get the energy in watt-hours per day. Add up all the watt-hour values to get a total for your application. This estimate is likely too low as there will be efficiency loses. </p><p></p><p>Example: Light bulbs run for 5 hours a day. Computer runs for 2 hours a day. 120 x 5 + 300 x 2 = 1200 watt-hours.</p><p></p><p>Now decide how many days worth of energy you want to store in your battery bank. Generally this is anywhere from two to five.</p><p></p><p>Finally we can calculate the minimum battery AH capacity. Take the watt-hours per day and multiply them by the number you decided upon. This should represent a 50% depth of discharge on your batteries. Therefore multiply by 2 and convert the kwh result into amp hours (AH). This is done by dividing by the battery voltage.</p><p></p><p>Example: You want the battery bank to last three days without recharging and that you use 1.8 kwh per day. As 1.8 x 3 x 2 = 10.8kwh, this is the energy we need from the batteries. Converting this to AH we have to divide by the voltage of your system. This can be 12, 24 or 48 for commercial application. If we choose to use 48V, the minimum AH capacity is then 10 800/48 = 225 AH. Now if you divide by your battery's rating you find the number of batteries you must use.</p></blockquote><p></p>
[QUOTE="Kapolani, post: 693172, member: 12584"] You're going to want a bigger battery bank than that. Figure out how long each electronic device will be run in hours during a day. Multiply the wattage of each device by its run-time to get the energy in watt-hours per day. Add up all the watt-hour values to get a total for your application. This estimate is likely too low as there will be efficiency loses. Example: Light bulbs run for 5 hours a day. Computer runs for 2 hours a day. 120 x 5 + 300 x 2 = 1200 watt-hours. Now decide how many days worth of energy you want to store in your battery bank. Generally this is anywhere from two to five. Finally we can calculate the minimum battery AH capacity. Take the watt-hours per day and multiply them by the number you decided upon. This should represent a 50% depth of discharge on your batteries. Therefore multiply by 2 and convert the kwh result into amp hours (AH). This is done by dividing by the battery voltage. Example: You want the battery bank to last three days without recharging and that you use 1.8 kwh per day. As 1.8 x 3 x 2 = 10.8kwh, this is the energy we need from the batteries. Converting this to AH we have to divide by the voltage of your system. This can be 12, 24 or 48 for commercial application. If we choose to use 48V, the minimum AH capacity is then 10 800/48 = 225 AH. Now if you divide by your battery's rating you find the number of batteries you must use. [/QUOTE]
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