I would like to understand the way of calculating or formula, how long a 24VDC 300watt load could last to function from a 24V DC 170AH truck battery?
Thanks.
Thanks.
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Thank you very much for your detailed coverage reply.Current is P/V, so a 300W load draws 300W / 24V = 12.5A.
The battery is rated at 170AH (ampere-hours) so the maximum life for a fully-charged battery would be 170AH / 12.5A = 13.6 hours.
But for good battery life you don't want to discharge a standard vehicle battery below about 50% of its capacity, so the maximum should be about 7 hours.
For discharge below 50% you would need to use a deep-cycle type lead-acid battery.
Thank you for your consideration about this situation, I should make it clear making use of a truck battery (24V 170ah) to run on the load would be charged by a battery charging equipment when it is needed, rather than the truck. Sorry to confuse you.That’s not the same answer as “how long would a 300W load run from a truck battery, and the truck would still start afterwards?”
Didn't want you to get stranded with a truck that won't start!Thank you for your consideration about this situation, I should make it clear making use of a truck battery (24V 170ah) to run on the load would be charged by a battery charging equipment when it is needed, rather than the truck. Sorry to confuse you.
Definitely, it is thankful for your consideration concern about my situation, and again, your further information about various types/grades of battery and its rechargeable life cycles is also an added knowledge to fulfill my requirements. Noted and thank you very much.Didn't want you to get stranded with a truck that won't start!
But as @crutschow says, use a battery that's designed for deep discharge. If you use a SLI (starting lighting & ignition) battery, it will probably last 100 cycles. 300 for a leisure battery, a few more for a deep cycle VRLA battery, or 2500 for a tubular plate battery.
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