What does 100AH 20HR mean?
The battery’s AH rating goes down the faster you use it. For deep cycle batteries the standard rating is 20 hours. So, if a battery has a rating of 100AH @ 20Hr rate, then that battery was discharged over 20 hours with a 5 amp load.
What does 12v 7ah 20HR mean?
General SLA Batteries are usually rated at 20HR, meaning their current over a period of 20 hours. If a battery is rated at 20Ah capacity at 20HR, it means that the battery can discharge 1 Amp per hour over that 20 hour period. A High Rate Battery will typically be rated at 10HR or less.
What’s the capacity of a 12v18ah battery?
With that said, as long as you’re not drawing more than 1.8A from your batteries, you can do your calculations based on a 36Ahx12V=432Wh (watt-hours) total capacity for the two parallel batteries. However, if your current exceeds 1.8A, then you’ll have to expect a bit less total output, as more energy will be wasted heating up the cells.
What is the effective capacity of a 20Ah battery?
If you discharge a 20Ah (20HR) battery over a 5 hour period you may have a loss of 25% and end up with 15Ah effective capacity. On the other hand, if you discharge a 20AH (10HR) battery over 20 hours you may end up with 23Ah effective capacity. Why do High Rate Batteries have lower Hour Rate?
How many hours does a 12V battery last?
So, assuming 5 of my lights turn on, at 7 Watts Each, that would be 35 Watts, divided by 12V would be about 3 Amps. Going strictly by the 18Ah rating I would expect 6 hours at that rate. (In reality, I never draw that much for that long.
Can you replace an 18ah battery with a 20Ah battery?
You could be forgiven if in replacing an 18Ah battery with a 20Ah battery in thinking that the new battery has a higher power rating, however it may just be the case that the rating has merely been calculated using differing parameters to the original.