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Old 26-08-2012, 11:29   #46
noelex 77's Avatar

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Re: MPPT Charge controller

You should be getting nothing like that voltage drop with that gauge wire over that distance.

I am not sure how this problem (of maybe a bad conection) is producing your symptoms. However, if there is a defective conection somewhere I would always suspect this of the cause of problems, rather than defective new equipment, which is rare.

I would trace with a multimeter where the voltage drop is occurring. Another option is to wire the CC directly to the battery (use a fuse) with some scrap (thick) wire and see if it performs OK.

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Old 26-08-2012, 12:35   #47
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Also check your ground path carefully. Noelex's idea of a temporary jumper to eliminate problems is a good one. I'd eliminate the voltage drop problem first before thinking about swapping controllers.

Depending on the logic in the controller, it could have a short timed bulk phase. If the voltage drop is that huge, could it be seeing a village greater than 16 after the timer turns off and then thinking it's a 24 volt system?

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Old 27-08-2012, 10:12   #48
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Re: MPPT Charge controller

Hi all,

Just off the phone with Blue Sky and they told me that the version of chip I have - V3.0 - has problems with high voltage panels ... The distributed who sold me the panel and cc were not aware. Annoyed to be handed the problem while dealing with a million other boat issues but was impressed that they will ship us a replacement today and we will ship the old one back.

The voltage drop issue is another issue which I still need to track down.

Really appreciate all the support. The cruising community is great.

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