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17 volts at a 12 volt battery bank???

PostPosted: Wed Mar 10, 2010 10:34 am
by johnrosendale
I have two battery banks on my boat. With the AmplePower alternator running, and an amplepower 3-step regulator, I get 14.6 volts on one bank and 17 volts on the other. I get 13 volts without the alternator running on each bank. Any idea why I would be getting 17 volts? Could this be a problem with a bad battery bank?

Re: 17 volts at a 12 volt battery bank???

PostPosted: Wed Mar 10, 2010 3:34 pm
by Coulomb
It sounds like you're charging through a battery selector switch. The regulator is sensing battery voltage on one bank, and not the other.
Try charging in both.

What model is the regulator.

Re: 17 volts at a 12 volt battery bank???

PostPosted: Thu Mar 11, 2010 9:26 am
by johnrosendale
It's a Model #1021-A Deep Cycle Regulator. I've noticed the voltage/temperature sensors are only attached to the bank of batteries that charges at 14.6 volts. Could this be why the other battery bank is charging through the switch at 17 volts? because the regulator doesn't recognize the increase in voltage from the alternator at that bank of batteries? Or could it be a bad cell in the battery bank?
I'm wondering... maybe I should tie the voltage/temperature sensor into both banks. Your thoughts?

Re: 17 volts at a 12 volt battery bank???

PostPosted: Thu Mar 11, 2010 11:49 am
by Coulomb
The #1021 regulator was made in the 1980s, but there are lots of them still doing a great job charging batteries.

It requires a #1018 voltage/temperature sensor on each battery bank to be charged independently.

You can contact Ruth to order a replacement sensor.

Re: 17 volts at a 12 volt battery bank???

PostPosted: Thu Mar 11, 2010 1:10 pm
by johnrosendale
So is this 1018 more than a simple 18 guage insulated wire? The one that I currently have running to one battery bank appears to be a simple wire without a "sensor".

Also, on the back of the Amplepower alternator there is a wire running from the positive output lug to ground on the alternator. It appears that somekind of a device is on circuit. What is this for?

You've been very helpful. Thank you!!

Re: 17 volts at a 12 volt battery bank???

PostPosted: Thu Mar 11, 2010 1:10 pm
by johnrosendale
So is this 1018 more than a simple 18 guage insulated wire? The one that I currently have running to one battery bank appears to be a simple wire without a "sensor".

Also, on the back of the Amplepower alternator there is a wire running from the positive output lug to ground on the alternator. It appears that somekind of a device is on circuit. What is this for?

You've been very helpful. Thank you!!

Re: 17 volts at a 12 volt battery bank???

PostPosted: Thu Mar 11, 2010 4:25 pm
by Coulomb
There's a sensor potted in the battery lug.

The itme on the back of the alternator is a transient absorber, called a snubber.

Re: 17 volts at a 12 volt battery bank???

PostPosted: Wed Mar 17, 2010 11:13 am
by johnrosendale
What is the "snubber" used for?

Re: 17 volts at a 12 volt battery bank???

PostPosted: Thu Mar 18, 2010 10:38 am
by Coulomb
It may protect the alternator from failure when the 1-2-both switch opens either manually or from overheating. See this URL: http://www.amplepower.com/apps/burnt_sw/index.html