House batteries won't start engine - ideas? - Page 2 - SailNet Community
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post #11 of 25 Old 03-12-2014
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Re: House batteries won't start engine - ideas?

im betting a switch issue or bad batteries...or improperly charged batteries due to any of the above suggestions...

contact cleaner is great for switches in general

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post #12 of 25 Old 03-12-2014
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Re: House batteries won't start engine - ideas?

Switch the banks, then you'll know if it's batteries or wiring.

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Re: House batteries won't start engine - ideas?

Quote:
Originally Posted by jcshipley View Post
Battery 2 is actually 2 deep cycles (group 27, 830 mca), almost brand new, in parallel.
You have over 1600 cranking amps at 32F! At 70F you are well beyond 2000 cranking amps! Your motor needs about 250A - 300A +/- for less than 0.2 seconds then about 150A for another couple of seconds. ANY deep cycle battery on the planet can EASILY start a small marine AUX diesel.

If these batteries are "almost brand new" then you have system wiring issue such as bad terminations, bad ground, bad switch, dirty ground, etc. etc.... Your house bank should start your motor far better than your single starting battery even at 50% SOC....

Easiest test to determine a wiring issue is flip flop the bank positive wiring.. If the other battery does the same on the #2 circuit start chasing wiring issues...

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Re: House batteries won't start engine - ideas?

I went through this recently on my boat.

Fundamentally the problem is likely to be a high resistance connection somewhere, because it's loose or corroded. At starting currents, even a fraction of an ohm is significant. It's quite possible to have a resistive contact that does not cause much loss at normal house bank currents (I never go over 20A), but when you start pulling 300A you lose several volts at the bad connection.

A starter needs ideally 9V, and the battery voltage might drop to 11V while starting, so that means no more than 2V drop across all your cables and the battery switch. All the connections need to be in tip-top state to achieve this.

There is no substitute for a careful measurement of voltage drops between the starter and the batteries, WHILE engaging the starter.

My main issue was a loose nut on a connection at the starter. However, I also replaced several poorly-made battery cables, and the Perko switch itself. The Blue Sea Systems switches are better. I got the battery cables from Genuinedealz.com, and went a size larger.

It REALLY starts nicely now!
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Last edited by MarkSF; 03-12-2014 at 02:15 PM.
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post #15 of 25 Old 03-12-2014
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Re: House batteries won't start engine - ideas?

My yanmar 2gm is often hard to start after it has sat for many weeks even if I put the batteries in parallel to double the current. I think this is because the 2gm is not the original engine (Original was a 1gm)and my batteries may be too small and because the lubricating oil film on the inside of the cylinders has gone away after sitting awhile. So, after sitting for a few weeks, I always relieve the compression first before cranking to allow it to get a good oil film and then I drop the compression in and crank again. Always seems to work. Any corrosion on terminals is bad when your batteries are iffy.
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Re: House batteries won't start engine - ideas?

Years ago, I stopped for someone in a parking lot with their hood up and jumper cables connected. I popped my hood; they hooked up their cables.

Their lights got noticeably brighter, but the engine wouldn't turn over.

They had El Cheapo jumper cables. I got out my set and had them running in 30 seconds.

Two lessons:
1. Always have your own gear that you can trust.

2. 12VDC 0.25A is very different from 12VDC 100A.

Their set had poor clamps and undersized cable. I suspect something similar on your boat. If you can, run jumper cables from House right to your starter*; if that cranks like mad it is your connections and/or cables. If not, it is your batteries.

Are the cables for House the same size as Engine?

Are they (a lot) longer?

Ken


*You'll want to be careful.
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post #17 of 25 Old 03-12-2014
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Re: House batteries won't start engine - ideas?

^^^good very good points

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Re: House batteries won't start engine - ideas?

One thing I found rather useful was a couple of 6 ft leads for the multi-meter, that I made. Large crocodile clips on one end, banana plugs on the other. The standard leads that come with the meter are nowhere near long enough.
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Re: House batteries won't start engine - ideas?

dude! I keep wanting to do that as I drop the multimeter ALL the time when testing stuff as the leads are just so damn short!

jajaja

I see im not the only one

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Re: House batteries won't start engine - ideas?

Thank you all for your assessments and suggestions, I will follow them and I will report back soon with anything useful for the community I have learned. Thanks again
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