Load test 240Ah C5 battery - what is the condition on this one?

[ason]

Has done a load test on a 240Ah C5 battery.
Used a 230VAC inverter and a hot air gun 1000W
The invertern was not so smart that it compensated for the voltage drop on the primary side, therefore the load decreased from 85.7A to about 49A when finished.

think its difficult to analyse this diagram, What energy can this battery hold?

[NEOH]

Has done a load test on a 240Ah C5 battery.
Use a 230VAC inverter and hot air gun 1000W
The invertern wasn

Try again without any special characters or symbols ...

[ason]

Sorry, now its fixed, found the problem

[NEOH]

ason ,
Who is the Manufacture and what is Model # ?

[NEOH]

The battery deliver about 139 Amp-Hours.

But you discharged the battery at a blazing C/2 rate, which is insanely fast.
Peukert's Law states that at a much slower (normal) C/10 or C/20 discharge rate, many more Amp-Hours are available.
And you did not discharge the battery down to 10.5 Volts.

[max2k]

Has done a load test on a 240Ah C5 battery.
Used a 230VAC inverter and a hot air gun 1000W
The invertern was not so smart that it compensated for the voltage drop on the primary side, therefore the load decreased from 85.7A to about 49A when finished.

think its difficult to analyse this diagram, What energy can this battery hold?

you need to use simple resistive load for the test, your setup had too many variables to serve as any indicator of energy stored. 240Ah battery at C/10 require 24A / 288W load. You can buy 4 inexpensive 12V 60W headlight bulbs, connect them in parallel and then to the battery. Measure current consumed by 1 bulb, multiply by 4 and number of hrs it will take to discharge your battery and you'll get much more accurate result. Bulbs have additional useful effect - they sort of maintain constant current during discharge by reducing their resistance at lower voltage.

[ason]

Thanks for the answers,
going to do the test again with bulbs.
This is a battery is a Midac 3MDL80

http://www.midacbatteries.com/batteries_motive/105/MDL-MBS.pdf