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Voltage drop on stern gate |
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Black Diamond
Vice Admiral Joined: 24 October 2015 Location: Newport, RI, US Status: Online Points: 923 |
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Posted: 14 July 2021 at 13:06 |
Has anyone else seen a pretty large voltage drop with the stern hydraulics? I'm worried about the motor being potentially damaged by low voltage over time. I know its a long run from the batteries to the stern hydraulics, but.... I've seen it drop to 11V and even 10.9V at times.. Then bounce back to where it was at 12.6V or something like that when its done its thing... Edited by Black Diamond - 14 July 2021 at 13:12 |
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Rick
S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
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kipwrite
Commadore Joined: 14 October 2015 Location: New York Status: Offline Points: 408 |
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I’d check the condition of the house battery bank.
See if other big current users - winches or the windlass if it runs off the house bank - result in similar voltage drops, with a rapid recovery. House batteries might be nearing the end of their service life.
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Kipwrite
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Black Diamond
Vice Admiral Joined: 24 October 2015 Location: Newport, RI, US Status: Online Points: 923 |
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not the problem. I was looking for voltage drops as part of recalibrating my systems for 6 brand new Firefly batteries. The batteries, solar, charger, alternator, etc all check out along with settings for float, bulk, absorb, etc.
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Rick
S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
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Wayne's World
Admiral Joined: 18 July 2012 Location: Cruising Status: Offline Points: 1111 |
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Rick,
Just did a test for you- our battery bank is 600ah Victron Lithium fitted in April 2019 (4 x 150ah) , SOC at time of test according to the BMV702 was 100% with a voltage of 13.25V. Solar was inputting about +20amps net at the time according to the BMV. Voltage went from 13.25V to 13.14V during lowering and then returned to 13.23V. Raising the transom door the voltage went from 13.25V to 13.14V then quickly back to 13.23V. The BMV showed a net AMP draw of -108 amps during lowering and -112 amps whilst raising. The difference could also have been caused by solar output changes as well. Hope this helps.
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Wayne W
Cruising, currently in the Caribbean and will head across the Pacific early 2024 |
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Black Diamond
Vice Admiral Joined: 24 October 2015 Location: Newport, RI, US Status: Online Points: 923 |
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similar, but a bit lower.
SOC showing 100%. Battery voltage: 12.9V Solar: 800watts putting out 20amps to keep up with an ice maker and the refrig/freezer. It was throttled back by the MPPT controller as the batteries were already fully charged and they just needed to keep up Lowering the gate dropped the voltage to 12.03V. Raising it a few seconds later dropped it to 11.94V It the popped back to 12.9V. I’m thinking more of a loss in wiring and not battery health given they are brand new and we’re tested a week or so ago when installed Edited by Black Diamond - 14 July 2021 at 21:57 |
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Rick
S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
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Arcadia
Rear Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 656 |
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Just to clarify guys, Are you measuring voltage drop at the pump with a handheld meter or are you measuring at the DC panel. I have to say Wayne, that one tenth of a volt drop on a 100 amp load sounds very low if you measured at the pump. I’m guessing the pump is seeing much less. And Rick, if that pump draws 100 amps, then a 1 volt drop isn’t all that bad given the gauge and length of the round trip cable run. If however, you are reading this on your DC monitor, that’s more troubling. Your house banks should be showing a minimum drop, closer to what Wayne is reporting. Just my 2 cents.
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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Pzucchel
Commadore Joined: 13 March 2020 Location: floating Status: Offline Points: 461 |
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Do you know the internal resistance of your battery? It limits the peak current it can deliver, generating a voltage drop. There is a passive and cheap device you can buy for few tenths of dollars that tells you all the parameters using a standard algorithm. If you apply it before and after the cables, it tells you where the possible problem is.
Edited by Pzucchel - 15 July 2021 at 07:17 |
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Hanse588#55
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Black Diamond
Vice Admiral Joined: 24 October 2015 Location: Newport, RI, US Status: Online Points: 923 |
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OK... I've already ruled out the batteries, and tested them, but I'm curious. What is the make and model of this tester? The test I had to run put the batteries on a tester for over 20 hours and it reported on capacity and discharge rates as well... Rick
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Rick
S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
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Pzucchel
Commadore Joined: 13 March 2020 Location: floating Status: Offline Points: 461 |
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I think it gives you the same answer, but in few seconds...
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Hanse588#55
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marcopone
Commander Joined: 24 April 2013 Location: Italy Status: Offline Points: 137 |
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At first I’d check the power cables connections, both sides.
Simply a loose nut could give you a huge voltage drop. Other oxid, everything could reduce/limit the watt flow to the motor.
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