How long should it take to charge 24v 250ah flooded tubular battery using mppt100/50. Consider 1400w at the mppt input from pv. Charging from cutoff voltage. Tested results would be nice.
asked
Quiz. Time needed to full charge
20/50/80 DoD?
Dear Sir ,
From personal experience ,without being an expert.
1400W on label solar array will provide 1000W maybe at the lowest 800W.
so if you say at 1000W@ 24V you get 40Amps ( approx. ) ( Math P = I*V)
so every hours you gain 40Ah ( 40 A per hour )
so if you are at 50% capacity (125ah consumed from the 250Ah) so you will need 3.125 Hours of Charging at 40A continually to get to full capacity / and after that a few more minutes to equalise and switch to float.
At least from my experience more or less that is how it goes.
If someone has a more official way to calculate this be my guest I am no expert.
Thank you in advance
The Harvester.
Would the acid battery accept the 40a through. I think from sheet max charge is 10%.
40A would be a bit to much.
Recommended for lead batteries is to charge them with 10-15% of it's capacity. So in your case 25-37A.
We have now 40a from internal charger when grid is on + 40a or so from pv. What happens when you have 80a going in using default settings easysolar 24/1600
what @Helios-Harvester said, should roughly work out, depending on the sun... of course.
my guess with the help of a little math and conversion losses (+10/15%) @ 20% DoD were about 5-6h charging time.
