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Old 11-11-2015, 08:17 AM   #110
ddunaway
 
Join Date: Oct 2014
Location: Seattle, WA
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Default Re: PAV Adventure 4x4 Build

Alternator charging test on final electrical system

There has been a lot of discussion of late on how the new alternators work, the current they output, and whether there is some built in "smarts" that impedes charging performance on our house battery systems. After a few days of playing with the Victron BMV 700 battery monitor, I was ready to collect some data. I ran the batteries down as far as I was comfortable, 60.9% SOC and 12.03V. Then I started it up at night (to avoid solar charging) and went for a drive. The lights were on. The house system being tested has 2 X DC115-12 Fullriver deep cycle batteries with charging controlled by the stock Mercedes ACR and a 6 cylinder engine with the stock 220 Amp alternator.

min SOC Amps
0 60.9 120
4 62.2 100
6 63.4 94
8 64.1 68
12 65.6 82
15 67.3 57
18 69.5 90
23 72.2 78
26 74 74
31 76.5 67
36 78.7 61
41 80.8 56
46 82.7 51
51 84.9 46

I was pleased with the performance with a relatively simple and inexpensive charging setup. The alternator shows no signs of limiting current as far as I can tell. I ran 2 AWG everywhere for charging. Distances to the batteries from the main pedestal are about 6 ft and 10 ft for the 2 batteries. I did go to some extra efforts to utilize 3 different chassis grounds (2 in the pedestal and 1 under the hood) to make sure that was a good connection.
Attached Files
File Type: pdf Charging Test.pdf (206.2 KB, 114 views)
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