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Search took 0.00 seconds. Search: Posts Made By: kubota
Forum: Electrical: Batteries, Generators & Solar 11-12-2023, 16:37
Replies: 28
Views: 3,876
Posted By kubota
Re: 50A shore power with 30A boat?

not worried bout the shore cord and pigtail.

but most boats have a fairly long run of interior
cable from the shore power connector to the main ac breaker on the panel.

depending on the...
Forum: Electrical: Batteries, Generators & Solar 04-12-2023, 10:08
Replies: 34
Views: 5,388
Posted By kubota
Re: A cardinal sin???

buy conventional lead acid cheap, isolate with a couple schottky diodes for $5 apiece off digikey.
diodes will match charging voltages approx also.
hold you over till replacement.
Forum: Lithium Power Systems 13-11-2023, 14:53
Replies: 60
Views: 5,333
Posted By kubota
Re: Big body alternator charging LiPo4 at only 12A mystery

there is a circuit with one transistor and and a pot called a Vbe spreader.
look it up.
it will give you a constant voltage drop regardless of current.
can be built exceeding small in place...
Forum: Engines and Propulsion Systems 25-09-2023, 18:22
Replies: 25
Views: 2,588
Posted By kubota
Re: Air Intake Silencer / Filter

on my westerbeke 55B. (isuzu block) main propulsion engine
(cabo rico)


also i have an isuzu 15kW gen and yes, a kubota tractor.


gen also uses K&N.
Forum: Engines and Propulsion Systems 25-09-2023, 10:42
Replies: 25
Views: 2,588
Posted By kubota
Re: Air Intake Silencer / Filter

k&n is the bomb.
running on my westerbeke for years.
reusable, better airflow, and cheaper than crap
westerbeke paper filters.
Forum: Construction, Maintenance & Refit 18-09-2023, 16:45
Replies: 33
Views: 5,293
Posted By kubota
Re: This has to be galvanic corrosion, correct?

ps:
antenna issue is a vector for both galvanic
and stray current corrosion.

takes a few inexpensive instruments to figure which you have, or if like one poster said its strictly
chemical...
Forum: Construction, Maintenance & Refit 18-09-2023, 12:32
Replies: 33
Views: 5,293
Posted By kubota
Re: This has to be galvanic corrosion, correct?

you mentioned a wire from a keel bolt to a chainplate.
this goes up your rig to the mast.
you most likely have a non isolated vhf antenna at top
of mast. this establishes a contact to the...
Forum: Electrical: Batteries, Generators & Solar 01-09-2023, 11:53
Replies: 52
Views: 4,829
Posted By kubota
Re: galvanic isolator, which one? 16amp or 32amp

hey Jedi,


assume you are specifying a modern toroidal isolation transformer.
the old iron common linear core beasts you find around marine stores
have problems of their own.

worth noting...
Forum: Marine Electronics 03-07-2023, 17:44
Replies: 43
Views: 3,789
Posted By kubota
Re: Marina shore power issue - breaker triggers and A/C protection

does the charge breaker only go when air con is powered?

2 shore cords or one with dual terminals?

what model inverter.

i have seen wiring issues with 230 and 110 system crossovers blowing...
Forum: General Sailing Forum 21-06-2023, 22:46
Replies: 47
Views: 5,349
Posted By kubota
Re: Lightning strike/damage avoidance question

wrote a nice polite reply in total agreement with your numbers, but a difference of opinion on what they indicate. the forum munched the reply.
ill try and catch up later.
Forum: General Sailing Forum 21-06-2023, 14:27
Replies: 47
Views: 5,349
Posted By kubota
Re: Lightning strike/damage avoidance question

ss bulk resistivity is 69x10e-8.
nichrome in toaster is 150x10e-8
copper is about 2e-8

however it is proportional to square of radius so in diameters used in 8mm rig wire
the resistance of a...
Forum: General Sailing Forum 12-06-2023, 11:11
Replies: 47
Views: 5,349
Posted By kubota
Re: Lightning strike/damage avoidance question

the mechanism of lightning is well understood and even reproducible in the lab.
that said, the atmospheric plasmas that give it birth are so effected by random chaotic factors (even a wind gust or...
Forum: Construction, Maintenance & Refit 05-06-2023, 10:20
Replies: 29
Views: 2,554
Posted By kubota
Re: Bonding

if is also possible to overzinc. creates alkali around fittings which will remove bottom paint and can cause damage like you described. Very destructive on wooden and auminum boats. The bond...
Forum: Construction, Maintenance & Refit 02-06-2023, 16:49
Replies: 29
Views: 2,554
Posted By kubota
Re: Bonding

ps. use an isolator between ac grnd on power inlet to boat and dock shore cord.
$120. you are certifiable insane not to have one if u are ever in a marina. without it every miswire on every...
Forum: Construction, Maintenance & Refit 02-06-2023, 16:39
Replies: 29
Views: 2,554
Posted By kubota
Re: Bonding

i suppose a diagram would help. can i do that here?
this is off subject of bonding and galvanic corrosion,
but the systems are interrelated so i always check both.

remove the negative cable...
Forum: Construction, Maintenance & Refit 02-06-2023, 15:54
Replies: 29
Views: 2,554
Posted By kubota
Re: Bonding

the marlon through hulls did not corrode.

the chain which is galvanized steel contacted the windlass drum and metal bow roller/chain keeper and formed a conductive path through the electric...
Forum: Construction, Maintenance & Refit 02-06-2023, 10:59
Replies: 29
Views: 2,554
Posted By kubota
Re: Bonding

i know its not galvanic, which was kind of the question.
but highly recommend you take the negative lug from battery off you power panel and then check the panel neg connection to battery negative...
Forum: Construction, Maintenance & Refit 02-06-2023, 10:06
Replies: 29
Views: 2,554
Posted By kubota
Re: Bonding

i carry a bonding potential meter and a silver half cell.
been called to survey boats with issues all over carribbean. some with all marlon thru hulls and owner still almost lost boat due to...
Forum: Plumbing Systems and Fixtures 24-05-2023, 11:27
Replies: 33
Views: 3,293
Posted By kubota
Re: Calculations on front opening fridges

for bout $100 i could build a small device we could mail around to owners of both ac and dc fridges.
clamp it over wires (no breaking connections), turn off all ac loads but fridge, hit the test...
Forum: Plumbing Systems and Fixtures 24-05-2023, 11:11
Replies: 33
Views: 3,293
Posted By kubota
Re: Calculations on front opening fridges

in ac power

watts = Vrms x Arms * pf
where pf is between 0 and 1.
we sometimes refer to kVA instead of
watts cause your inverter actually has to produce kVA.

in a strange twist, the...
Forum: Plumbing Systems and Fixtures 23-05-2023, 11:21
Replies: 33
Views: 3,293
Posted By kubota
Re: Calculations on front opening fridges

thanks for the replies.

no, i don't use square wave inverters.
give me some credit guys. i actually heard
about the discovery of the wheel somewhere.

power factor is a characteristic of...
Forum: Plumbing Systems and Fixtures 22-05-2023, 10:38
Replies: 33
Views: 3,293
Posted By kubota
Re: Calculations on front opening fridges

what am i missing?
my bd5 cools 1cu meter at 4.5 amps 12v at 50%
duty cycle. also a hard freezer compartment with meat for six weeks. been doing that for 22 yrs of cruising in tropics and...
Forum: Electrical: Batteries, Generators & Solar 05-05-2023, 10:52
Replies: 28
Views: 2,027
Posted By kubota
Re: Shunt question

with a dpdt switch, 2$ on amazon, u can monitor two banks with one monitor for amps fuction.
amp-hrs not so much.
Forum: Marine Electronics 01-05-2023, 09:23
Replies: 260
Views: 27,781
Posted By kubota
Re: Starlink Maritime now starting at $250/month

agree 100%. at sea, $250 for good weather and comms
on passage is a godsend.

spent 9 days in a hurricane at sea on a 40fter cause of delays in info
from noaa and weather routers on ssb.
id...
Forum: Marine Electronics 01-05-2023, 08:11
Replies: 260
Views: 27,781
Posted By kubota
Re: Starlink Maritime now starting at $250/month

go sailing, travel to distant exotic lands
with exciting unusual people and sit on your boat
and watch hollywood trash?

really?

if its a business expense for those working remote,
$250...
Showing results 1 to 25 of 50
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