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Old 15-10-2016, 17:49   #1
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Join Date: Jul 2015
Posts: 10
High voltage on Solar Boost 2000e

I have a used Solar Boost 2000e charge controller. It reads much higher voltage all the time. Multimeter shows me 12,5v whereas charge controller indicates 14v. When I run alternator it goes up to 19,5v.
Does it mean it's broken?
There is no temperature sensor, switches 3&4 in off position. Cool room temperature. Solar panels are disconnected.
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Old 22-10-2016, 22:33   #2
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Join Date: Feb 2015
Location: Hawaii
Posts: 12
Re: High voltage on Solar Boost 2000e

Check if the wire between your solar controller and batteries has a large voltage drop across it. To do this, run a voltmeter between the + on the controller output to the battery and the + on the battery (so you are just measuring from one end of the wire to the other). Do the same for the -ve wire.

If you measure a voltage that is more than a few tenths of a volt, then you need to determine why. There are two likely reasons:

1. Your wire is too small. Check the AWG vs length is appropriate for the anticipated current. Err on the side of too big, because when you have 10 - 15 amps flowing in it, it gets hot and the resistance goes up, and the voltage difference increases. A bigger wire stays cooler because it has a lower resistance.

2. The connector at the controller to your wire (either + or -) has a fault and is not making a good connection to the wire. Try jiggling the wire at the both ends and seeing if you can detect a change in the voltage read by the 2000e. This can be a bad connection inside the 2000e or it can be a bad connector on the wire.

A few months ago, I had a 2000e fail in this manner (2, connection at the controller was bad) while I was near the end of a pacific crossing to Hawaii, and I am in the process of returning it to Blue Sky to find out how much they will charge to repair it. It destroyed my batteries because it thought the batteries were fully charged, but they were not. I did not have a low voltage cut-off. I do now!

I do not understand the 19V alternator reading. That's weird. Suggests your alternator regulator is toast? What does your DVM read at the battery when your alternator is running and the 2000e says 19V? What is the voltage difference across the wire then?
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