it’s just something to have in your back pocket as the batteries age. You can also do it with any good charger which allows you to specify the volts, but why buy that when you now have that capability with your Victron CC. Only problem is the Victron will only allow you to hit it with an equalization charge for 1 hour. Severely sulfated batteries, which is most likely what’s going on with your current batteries, require an 8 hour equalization charge. But anything helps.Thanks!
not sure ill start messing with custom charge parameters, that's well out of my knowledge range.
Actually, your testing description has a conflict in terms.
Measuring "current" cannot be done in an "open circuit" configuration.
Could you describe how you were getting that current (0.4 to 0.485 amps) reading?
i.e. Where were you attaching the wires to your meter?
What scale was the meter set on?
IF you have a typical volt/ohmmeter, it has a separate socket for a 10 amp current reading.
To activate that socket, the meter's selector knob has to be set to the 10 amp position.
The "10 amp" socket gets the positive panel wire, and the COM socket gets the negative.
That hookup should actually be testing the Isc of the panel, since the resistance between the 10 amp socket and the COM socket should be very very close to zero. (you can test that statement with another ohmmeter looking at only the "10 amp" meter (no panels attached).
I'm perfectly willing to believe that testing for Isc (as above) would only yield 0.4 amps for a variety of reasons, i'm just trying to clarify the situation.
(but among the issues: if EACH panel were capable of 0.4 amps, your "all four in parallel" should've yielded 1.6 amps (four times 0.4).)
yea, which leads me to believe they are old and toast.Just to clear up the point of "old" 25 years plus, is old even with the older technology, virtually all panels had a 25 year warranty even if they declared how much they degraded with age. However the warranty did not cover damage and it is unusual to damage 4 panels without some obvious cause.
As Dick correctly says, if the ISC (Short Circuit Current) is 0.4 amps (the panel spec says 4.97 amps) and 4 in parallel should yield 1.6 amps or 19.88 amps if up to spec.
Good news - no need to give any more thought to those old panels. Literally anything will be better. Scrap them out and move on.
Give them to the kids next door as a summer hobby. They put out so little power that it is unlikely that they can hurt themselves even if they don't use a charge controller on a car battery.
Your neighborhood status will go from solar newbie to solar expert in a week.
Ya.does the volts on the panel matter since I hhave 4 (12 volt) batteries?
i.e. 24v or 36v 300watt panel
Or am I required to have a 12volt panel?
from my very limited and new understanding, I should be ok with any of those three options, 12-24-36.