How Do I Test My Boat’s Batteries to Find Out if They Are Still Good?
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- Опубліковано 26 сер 2024
- "I am just about to complete the purchase of my new (used) boat," writes Dave. "There are (2) 12V lead-acid batteries both around 90Ah in size, one for engine start and one for the house. Is there a way to establish the condition of these batteries? I don't wish to head out in the new boat to find out the batteries are not holding a charge."
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I chose to buy new batteries when I got my boat. They aren’t much on top of the cost of the boat and the peace of mind is well worth it in my opinion.
Good point.
Just buying a new boat so this is helpful info Jeff. I was wondering, “how do I know if my batteries are any good?”
for deep cycle batteries the only real test is a c20 test. unfortunately it takes 20 hours and requires a few tools to make it easy to do.
Very Helpful. Thanks for the tips. Will get some testing done!
Glad it was helpful!
Does the c 20 test apply for lithium batteries as well ?
Hi Jeff
Have you made a video on ElCI
On older boat or new requirements AByc
Just purchased a Konnwei KW208 battery tester. Seems to work ok. Sure hope it gives accurate diagnosis of batt condition. Just trashed a $330 grp 31 agm battery based on test. Are you familiar with how these testers work. Do they replicate the tests you describe only in a few seconds?
Using 650 tester same brand. All this toys are good for quick initial checks. Due to their internal algorithms. For accurate figures only long tests are suitable . I mean if it shows OK- it’s OK in most cases. Wen “replace” -you have to perform more tests to be sure.
i have a 3 pole off 1 all 2 battery switch . boat starts on all position ,then switched to position 2 crank lead acid wet 94 cca on my boat. motor started .but when i switched to position 1 house 200 a/hr agm deep cycle to simulate crank battery fail, all i got was a failed attempt .am i expecting to much from my house battery to start the engine on its own in emergency ?or should you only attempt start in the all position in a emergency.both batteries had been on shore power for a couple of days and disconnected from shore power to try this start test. engine 30hp Yanmar diesel
I think you mentioned a c20 test was on a lead acid battery. Can I do the same test on my firefly battery and are the numbers the same? Down to 10.5?
I'm curious about leaving a boat on the hard for the winter. With no shore power what is the best way to maintain the batteries? Could I hook a solar panel up? Do I leave switch on...or combine?
do you need to power anything on the boat? I would disconnect the batteries compleatly so there is zero drain. The only issue then is the boat filling up with rain water if it leaks. Since you no longer have a bilge pump. (yes it happens) A boat left in the water I would defiantly not leave with no bilge pump power.
I'm asumming everything gets winterized so it can't freeze?
Side note: any chance you're mistakenly not using your fancy mic? I hear a lot of delayed reflection, which sounds like the perspective of where your laptop might be, rather than where the mic is.
Thanks Pete for the feedback, passed along your comments to the production team.
Jeff, the sound quality on your recent videos really sucks. Please look into this.
Agreed. I remember seeing a really good tip about publishing on UA-cam and they said people will put up with poor video quality but not poor sound. Poor sound will destroy good content. There is lots of good advice on UA-cam on how to improve sound quality. Having said that, Jeff, thanks so much for doing this stuff. I find these videos very helpful.
Hi Peter - tech people here looking into to sound issue - can you give us a few details? Sound level? Fuzzy? Muffled? Thanks for the help!
@@PacificYachtSystems Your voice is like you lost voice on a party , Rusty .. 😂😂
Nice work bro
@@PacificYachtSystems muffled and tinny. Like you're talking inside a large beer can, hahaha
Jeff by any chance do you have both mics turned on, the camera mic and you desk top mic? The audio is combing.
How does the specific gravity of the electrolyte figure in testing a FLA battery?
Here's a useful link i found:
deepcyclebatterystore.com/use-battery-hydrometer/
Sorry, but in videos before sound was much better.
Thanks Janis, based on your feedback, working on it.
45/90??? or 10/20?
Hi Matias, can you give more context to your question, still cannot figure it out.