Thread Tools Search this Thread Display Modes
Old 05-29-2022, 10:04 AM   #21
Senior Member
lwarden's Avatar
City: San Diego
Vessel Name: North Star
Vessel Model: Lindell 36
Join Date: Jun 2020
Posts: 342
I tried one of the Supco capacitors and it did nothing to bring down the spike in current when my larger AC unit kicked in. I installed a Micro-Air Easystart and I was impressed how well it damped down the startup current.

Now, my actual problem was not the AC unit but a bad breaker in the generator which melted down, but that is a story for another thread.....
North Star
Lindell 36, Twin 370hp Cummins
lwarden is offline   Reply With Quote
Old 05-29-2022, 01:26 PM   #22
Veteran Member
City: Savannah
Vessel Name: Sweet Lu
Vessel Model: Marine Trader sundeck
Join Date: Feb 2019
Posts: 68
It sounds like you said it used to work better, but has started getting worse. I would check the following first.(some have already been mentioned).
1. check all wiring connection from the breaker to the unit. bad connections get worse and make starting harder as time goes on.
2. check, or replace all capacitors.
3. check or replace breakers.
If the problems still exist, install a hard start capacitor like the cheap supco shown earlier(these are more effective for low voltage situation tho).
The soft start controls are the best but most expensive option. If it used to work, then something is different. find what has changed/failed and repair it.
Sounds like low voltage due to bad wiring connection to me.
TWedd is offline   Reply With Quote
Old 05-29-2022, 02:14 PM   #23
Soo-Valley's Avatar
City: Gulf Islands, BC Canada
Vessel Name: Soo Valley
Vessel Model: Grand Banks 36
Join Date: Jul 2019
Posts: 2,896
I would like to know;
1st. if you have two panels, one has a 30 amp main, does the other have one too?
2nd? If you have a 50 amp main breaker why do you need to have a 30 amp sub panel main breaker?
3rd. Can you move the troubled AC to the other panel?
SteveK AKA Soo Valley
You only need one working engine. That is why I have two.
Soo-Valley is offline   Reply With Quote
Old 05-29-2022, 05:08 PM   #24
OldDan1943's Avatar
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 9,639
A. installed a new A/C
B. after a few months, suddenly the generator started a shallow and infrequent 'hunt'.

The only new load I added was the the A/C
I added a 'soft start', problem gone.

I have since added a 'soft start' to the other A/C too.
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is offline   Reply With Quote
Old 05-30-2022, 05:50 AM   #25
Senior Member
Turtle Blues's Avatar
City: Chesapeake Bay
Vessel Name: High Noon V / SV Evelyn
Vessel Model: Golden Star 42 / Ericson 30 / Yard full of trailer boats
Join Date: Mar 2020
Posts: 107
This is why there is a difference in terms.
A normal HVAC Hard Start capacitor like the Supco is designed to supplement a compressor on startup. It does not buffer the current surge or draw. It is designed to hit hard and fast to assist a compressor starting under load.
A marine AC Soft Start control depending on the brand may have several capacitors and more importantly a logic board to control the starting load. It is designed to smooth out the ramp up of a compressor. That is why they are exponentially more expensive.
Turtle Blues is offline   Reply With Quote
Old 06-03-2022, 04:48 PM   #26
City: Cape Coral
Join Date: Mar 2019
Posts: 17
Micro Air

Had a 16K air con unit in the salon and a 6.5 K air con in the aft cabin of my Beneteau. Single 30Amp circuit.
Both ran fine at the dock but neither would run on the Honda 2200.
Added the MicroAir to each. The Honda loved it. Ran both effortlessly
NVR II Nauti is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program

All times are GMT -5. The time now is 05:52 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012