Quote:
Originally Posted by HPsauce
DEFINITELY. 
We're talking about 100Ah batteries here (or thereabouts) and charging efficiency is way below 100%.
I'd GENUINELY allow a whole WEEK non-stop with that charger. |
^+ What he said.
5 hours @1A is 5Ah at 100% efficiency(actual varies greatly depending on several variables 0-92%) Let's say you got 80% efficiency, that's 4Ah - less than what you get in scooter battery. Considering it was still operating lights it probably had 5-10% charge in it so after charging it was 10-15% and you probably need 20-25% to start the car. For a
good battery of that size (95AH) you expect 12+ hours @10A to go from 10% to 90%. Good battery with low charge level will charge at 80-90% efficiency but it will drop as battery gets more charged. If you have full battery efficiency will be 0% as you will be putting in current but charge will not be increasing, you will just use energy to split water in H2 and O2. Bad/damaged battery charge efficiency can be considerably lower.
Question is if the charger is 1A only or battery is only taking 1A in.
I have several power supplies around he home- laptop, NAS and others around the home at 12V ranging from 2A to 7.5A which could be used to charge battery at faster rate if my battery charger went down. They would not charge it to 100% as idle voltage is only 13-13.5V but they would probably get it up to 70-80% and at 7.5A they would get there a lot faster then 1A charger. So have a look around the house you might have unsuspected suitable hardware lying around.