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Search: Posts Made By: KTP
Forum: Electrical: Batteries, Generators & Solar 15-03-2019, 08:57
Replies: 89
Views: 6,888
Posted By KTP
Re: Are these cheap lithiums ok to use??

I mean yeah, if you are sailing in the Puget Sound where the water temp is always around 40 to 50 F and you put your LFP batteries below the waterline near the hull (but not in the engine room) they...
Forum: Electrical: Batteries, Generators & Solar 15-03-2019, 08:41
Replies: 89
Views: 6,888
Posted By KTP
Re: Are these cheap lithiums ok to use??

Here is the data I am looking at:

The 92AH 12.8V Trillium drawn down 80% regularly will yield 942 watt-hr per cycle and is good for about 5000 cycles (so they say).

That is a total of 4.71...
Forum: Electrical: Batteries, Generators & Solar 09-03-2019, 15:52
Replies: 89
Views: 6,888
Posted By KTP
Re: Are these cheap lithiums ok to use??

1200 AH of lead acid at 48V is going to be around 2700 pounds
Forum: Deck hardware: Rigging, Sails & Hoisting 08-03-2019, 08:02
Replies: 82
Views: 9,783
Posted By KTP
Re: Near Disaster. Whos to blame?

Except you don't. Most surveys are only useful in the head.
Forum: Electrical: Batteries, Generators & Solar 07-03-2019, 07:34
Replies: 89
Views: 6,888
Posted By KTP
Re: Are these cheap lithiums ok to use??

Well the Trojan Trilliums are rated for 5000 cycles and are $750 for 92ah at 12V. 12 of those would give you 48V @ 276ah for $9,000
Forum: Electrical: Batteries, Generators & Solar 28-02-2019, 08:03
Replies: 44
Views: 2,201
Posted By KTP
Re: Portable Power Banks

FF is twice as heavy as lithium, has the same problems with Peukert's formula as regular lead acid.

It is about half price though. $500 for a 110ah vs $1000 for a 110ah Trojan Trillium.
Forum: Electrical: Batteries, Generators & Solar 21-02-2019, 14:49
Replies: 44
Views: 2,201
Posted By KTP
Re: Portable Power Banks

Wait for the Trojan Trilliums to come out and then just slap a cheap pwm solar charger on the side of one. You then have a waterproof, bulletproof 1200 watt-hr power source with solar charging that...
Forum: Electrical: Batteries, Generators & Solar 19-02-2019, 14:52
Replies: 395
Views: 11,843
Posted By KTP
Re: Comparative Safety: 12v v 24v v 48

Yeah I was typing while eating pizza and forgot to square my voltage before multiplying the resistance.
Forum: Electrical: Batteries, Generators & Solar 19-02-2019, 13:34
Replies: 395
Views: 11,843
Posted By KTP
Re: Comparative Safety: 12v v 24v v 48

He is right.

If you have a 1 ohm pure resistive load fed by 12V, you draw 12 amps from the battery. The load dissipates 12 watts. A good contact in this series circuit with 0.001 ohm resistance...
Forum: Liveaboard's Forum 17-02-2019, 15:04
Replies: 145
Views: 9,530
Posted By KTP
Re: Sailing in recession ?

You could buy a sailboat and buy far dated puts, such that when your sailboat drops 100k because Europe crashes, your puts go up $1M and you can buy a bigger boat.
Forum: Meets & Greets 17-02-2019, 10:05
Replies: 46
Views: 2,135
Posted By KTP
Re: Yep, one of those guys ;)

We are going the hybrid route, although I don't think our boat is big enough for a diesel gen set so will have to be a EU2200i for now.

I think your budget might be a bit low. I can't even walk...
Forum: Electrical: Batteries, Generators & Solar 17-02-2019, 09:39
Replies: 395
Views: 11,843
Posted By KTP
Re: 48V as main DC voltage on boat - anyone?

Right but aside from shock potential, the I^2 R losses in a poor connection at 48V are a lot less than those in a 12V connection for a given load.

Say you have a 1000 watt load. At 12V that is...
Forum: Electrical: Batteries, Generators & Solar 16-02-2019, 08:34
Replies: 49
Views: 4,142
Posted By KTP
Re: Group purchase of 8D 300ah Lithium batteries

Some of the more weight likely comes from the waterproof case and safety circuitry on the TTs.

What I like in theory about them is that with each battery monitoring itself and capable of...
Forum: Electrical: Batteries, Generators & Solar 16-02-2019, 07:48
Replies: 49
Views: 4,142
Posted By KTP
Re: Group purchase of 8D 300ah Lithium batteries

The Trojan Trilliums (waterproof, canbus, real disconnect, high/low/temp protections) are less than $650 a kwh in quantity. No BMS needed.

You also don't have to wait by the dock for a boat from...
Forum: Electrical: Batteries, Generators & Solar 16-02-2019, 07:41
Replies: 53
Views: 2,526
Posted By KTP
Re: power generation upfit

If you really motor that much, why did you go the sailboat route instead of a trawler? Seems like all you really gain is a lightning rod?

Also, if you are running a diesel at 20HP continuously,...
Forum: Electrical: Batteries, Generators & Solar 15-02-2019, 13:04
Replies: 171
Views: 11,259
Posted By KTP
Re: 48V as main DC voltage on boat - anyone?

We went with Gigavac switches, which are rated at something like 80V DC and 350 amps.

Not that expensive either compared to Blue Sea. About $30 a switch
Forum: Electrical: Batteries, Generators & Solar 15-02-2019, 09:18
Replies: 53
Views: 2,526
Posted By KTP
Re: power generation upfit

If an electric outboard won't get you there in a reasonable time on, say 2kWh of battery, then rowing is going to take ages.

The best athlete could put out maybe 300 watts sustained, so 2kWh would...
Forum: Electrical: Batteries, Generators & Solar 15-02-2019, 07:12
Replies: 53
Views: 2,526
Posted By KTP
Re: power generation upfit

Nah 20kWh isn't that big actually. Size and weight on LFP means we could go to 50kWh but the cost needs to drop a bit. I am hoping eventually (next few years) LFP drops the way solar panels did.
...
Forum: Electrical: Batteries, Generators & Solar 14-02-2019, 17:08
Replies: 53
Views: 2,526
Posted By KTP
Re: power generation upfit

It does sound like the EU2200 is as close to a free lunch as one can get though. We plan on carrying one to help out occasionally on our EP sailboat, which will have a really big battery bank...
Forum: Electrical: Batteries, Generators & Solar 10-02-2019, 08:32
Replies: 59
Views: 4,288
Posted By KTP
Re: Are two partially shaded total 260W panels worth it

I like the idea of one controller per panel except that if you have a larger battery bank, like 48V the problem is almost no controller does boost. Very few solar panels also have a open circuit of...
Forum: Our Community 09-02-2019, 08:35
Replies: 20
Views: 727
Posted By KTP
Re: Sailing below freezing

There have been gale warnings almost every 4 days up in your area. Would the class give a refund or postpone if they decide not to go out?
Forum: Cruising News & Events 08-02-2019, 08:58
Replies: 17
Views: 2,644
Posted By KTP
Re: Boat sinks near Gig Harbor, WA with one fatality

No

The solution is not to pas more restrictions against anchoring, because that just punishes those of us who obey the law.

It is like passing a law to make murder more illegal. All you need...
Forum: Electrical: Batteries, Generators & Solar 07-02-2019, 19:36
Replies: 171
Views: 11,259
Posted By KTP
Re: 48V as main DC voltage on boat - anyone?

Except that likely the people installing higher voltage DC systems on boats understand more than the average boater about all of this and thus have proper fuses and proper crimps, use tinned marine...
Forum: Electrical: Batteries, Generators & Solar 06-02-2019, 17:34
Replies: 25
Views: 2,076
Posted By KTP
Re: PSC34 electric propulsion conversion progress

Finally got a break in the constant gales and managed to take the boat out for a trial run of the electric propulsion.

We didn't go far because it was getting late in the day. I think we did...
Forum: General Sailing Forum 05-02-2019, 09:49
Replies: 80
Views: 6,071
Posted By KTP
Re: mice on board help !

If you float sunflower seeds in a bucket half full of water and have a board or ramp leading up to the edge of the bucket, mice will just jump right in. I guess they think the surface of seeds is...
Showing results 1 to 25 of 217

 
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