Battery tester
- Thread starter gettinthere
- Start date
Even the best of those, and that one is far from good quality, does not tell us anything we really need to know for house bank use. Even with a baseline>forward type of use they still tell us very little about the state of health of our banks for deep cycle use.
The best test you can do is to apply a 7.5A load (150Ah / 20=7.5A) or lights or resistors etc. to one of your fully charged batteries at a temp between 72 & 80F and count how many hours & minutes it runs before you hit a terminal voltage of 10.5V. All you need is a timer, a digital volt meter and a 7.5A load.. It should run 20 hours if the battery is producing its rating, highly unlikely at this point for your batteries though. Anything below 80% of as new capacity rating is getting into suspect use territory and anything below 65-70% of capacity is getting dangerous..
Are Impedance Testers Worth It?
The best test you can do is to apply a 7.5A load (150Ah / 20=7.5A) or lights or resistors etc. to one of your fully charged batteries at a temp between 72 & 80F and count how many hours & minutes it runs before you hit a terminal voltage of 10.5V. All you need is a timer, a digital volt meter and a 7.5A load.. It should run 20 hours if the battery is producing its rating, highly unlikely at this point for your batteries though. Anything below 80% of as new capacity rating is getting into suspect use territory and anything below 65-70% of capacity is getting dangerous..
Are Impedance Testers Worth It?