- #36
OmCheeto
Gold Member
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And I thought my numbers were goofy.Wolst73 said:OmCheeto, post: 5510606, member: 103343"]Simply hook your panel directly to the LED system, without the battery.
Then let us know what the voltage is.
Solar Panel hooked directly to DMM showed 19.4V.
Panel hooked directly to Vin on led driver and DMM hooked up to Vout showed 40.4V
40.4 volts * 0.7 amps = 28.3 watts
Didn't you say your LED's were 18 watts?
And didn't you say your panel was rated at 20 watts?
Is it a fair guess, that you didn't hook up your LED's?
Maybe this will shed some light on the problem?
You really need another meter...
ps. Fun thread.
Found out my battery was not sulfated, like my last one.
![Red Face :redface: :redface:](https://www.physicsforums.com/styles/physicsforums/xenforo/smilies/oldschool/redface.gif)
Code:
charging a battery, with a 40 year old, DIY battery charger:
time amps volts watts wh cumulative SOC notes
00:00 0.0 12.46 0 75% resting voltage
00:00 2.9 12.86 37 started charge
00:01 2.7 13.09 35 0.6
00:02 2.6 13.26 34 1.2
00:03 2.5 13.40 34 1.8
00:04 2.4 13.48 32 2.3
00:05 2.4 13.53 32 2.8
00:06 2.4 13.55 33 3.4
00:07 2.4 13.57 33 3.9
00:08 2.4 13.57 33 4.5
01:00 2.4 13.58 33 33
02:00 2.3 13.65 31 65
03:00 2.2 13.71 30 97
06:10 2.1 13.82 29 192
07:30 2.2 13.85 30 232
10:00 2.1 13.89 29 306 ended charge
16:20 12.68 100% resting voltage