My plan is to buy 4x 10cm x 5cm 48V heater pads and use them under the alluminium sheet to heat the 24V battery bank during cold weather. Does my calculation make sense, and would the following wattage be enough to heat the batteries? I'm open to suggestions.
4x 48V heater pads would result in 10cm x 5cm = 50cm2 * 0.4 (heater pad specified W/cm2) = 20W per 48V pad. Connecting 24V battery to 48V pad would provide 1/4 watts (is that right?), so 5W per pad. 4 pads each 5W = 20W of total heat.
My main requirement is for heating pad to not exceed ~40C. Does anyone has experience with these pads and could tell me whether connecting 1/2 of specified voltage would drop the max temperature to ~40C, or it would be better to use something like 6x 24V heating pads (with 3 pairs in series, so 10W per pair, 30W total) Each pad would use maximum of 5W, so essentially it is 1/4 of the specified power.
4x 48V heater pads would result in 10cm x 5cm = 50cm2 * 0.4 (heater pad specified W/cm2) = 20W per 48V pad. Connecting 24V battery to 48V pad would provide 1/4 watts (is that right?), so 5W per pad. 4 pads each 5W = 20W of total heat.
My main requirement is for heating pad to not exceed ~40C. Does anyone has experience with these pads and could tell me whether connecting 1/2 of specified voltage would drop the max temperature to ~40C, or it would be better to use something like 6x 24V heating pads (with 3 pairs in series, so 10W per pair, 30W total) Each pad would use maximum of 5W, so essentially it is 1/4 of the specified power.
