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Old 07-11-2005, 11:09 AM   #1
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I have seven solar panels on the roof of my Montara. Yesterday I did an hour by hour record of the amps coming from the two 3 panel arrays.

I only obtained 9 amps max out of each array. In the past I have been able to obtain nearly 12 amps from each array of 3 Siemen's 4.4 amp output panels? Could it be the 110 degree heat?

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Old 07-11-2005, 11:09 AM   #2
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I have seven solar panels on the roof of my Montara. Yesterday I did an hour by hour record of the amps coming from the two 3 panel arrays.

I only obtained 9 amps max out of each array. In the past I have been able to obtain nearly 12 amps from each array of 3 Siemen's 4.4 amp output panels? Could it be the 110 degree heat?

David/zetron
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Old 07-12-2005, 02:45 PM   #3
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While it is possible that the temperture has some impact, much more likely is the state of the charge of your batteries. As they become fully charged the voltage rises and the output of you solar arrays will drop. That is what is supposed to happen. If it did not the batteries would be boiled dry and destroyed. To make a useful observation, you need to know the voltage of your batteries in a resting state, for each observation.
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Old 07-12-2005, 05:02 PM   #4
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Kirk: I thought I could push the voltage up to 14.2 using six 75 watt panels on my four 6 deep cycle 6 volt batteries?

I have so many things running that by twilight my batteries respond to running my computer (about 5 amps) by dropping to 12.4 volts. I am recharging the batteries evryday with my Heart Inverter charger (50 amps) since I have such heavy usage of the swamp cooler. I rthink the motor on that swamp cooler is taking more than the 4.6 amps that the manufacturer said it would at max; more like 8 amps.

I read somewhere that you can lose as much as 20% of your output from solar panels in Arizona type heat. I also read that the panel will outperform its specs. when the temperature is lower even if the sun is also lower in the sky. Come to think of it, I saw the 12 amp/3X75watt panels produced in March!

I also run a wind generator. I got mine from the place that builds them in Flagstaff. Mine is a Air 404, I believe. I have the wind generator mounted to the back of the motorhome. It comes up on a pipe that goes down through the area between the shower and bed. One steel pipe inside another. You pull it up and put a bolt in the proper holes. Lately it really has not been that noisey? It can keep me awake at night.

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Old 07-12-2005, 05:37 PM   #5
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Solar panels recharge best on a sunny day that is about 60 degrees.
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Old 07-15-2005, 07:49 AM   #6
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Scooter: That was probably where the temperature was when I saw the 12 amps.

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