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Forum: General Discussion 07-14-2018, 09:03 PM
Replies: 31
Views: 3,009
Posted By tfmkevin
Hi Jim, I think the use of "propogated"...

Hi Jim,

I think the use of "propogated" versus "replicated" is a nit in this situation, but I'll bite anyway. The error was not replicated. The error in the derived vector charts is different...
Forum: General Discussion 02-20-2018, 06:03 PM
Replies: 38
Views: 4,143
Posted By tfmkevin
We're adding the AT365 to the table in the...

We're adding the AT365 to the table in the article now. Thanks for the suggestion!

We originally didn't include it in the table because despite sharing the same hull, the two boats are very...
Forum: Electrical and Electronics & Navigation 11-30-2016, 09:48 PM
Replies: 10
Views: 1,621
Posted By tfmkevin
Yep, I was going based on Lifeline 6V GPL-4CTs...

Yep, I was going based on Lifeline 6V GPL-4CTs (2x6V=12V)
https://www.amazon.com/Lifeline-Marine-AGM-Battery-GPL-4CT/dp/B0029XJ1U6

$399US each on Amazon - so closer to $800 for 12Vx220Ah.
Forum: General Discussion 11-30-2016, 08:57 PM
Replies: 105
Views: 9,272
Posted By tfmkevin
AT and Airstream? You should check out our blog...

AT and Airstream? You should check out our blog (Riveted - link in my signature line). We've done extensive cruising in the area you're looking at - Puget Sound through the top of SE Alaska - 500+...
Forum: Electrical and Electronics & Navigation 11-30-2016, 08:11 PM
Replies: 10
Views: 1,621
Posted By tfmkevin
Well, lithium is expensive, yes. But to do a...

Well, lithium is expensive, yes. But to do a realistic total cost-of-ownership comparison with AGM batteries...

Lithium costs - in round figures today - $1K per 100Ah at 12.8V. Assuming lithium...
Forum: General Discussion 10-22-2016, 04:49 PM
Replies: 49
Views: 5,737
Posted By tfmkevin
Hi Pete, A few clarifications: - A Max...

Hi Pete,

A few clarifications:
- A Max Marine system is not a "WiFi Booster". It has a feature that does this, but it is a "bonus" and not the main function of the device. It does offer some of...
Forum: General Discussion 10-21-2016, 03:43 PM
Replies: 49
Views: 5,737
Posted By tfmkevin
The primary thing a phone as a wifi hotspot will...

The primary thing a phone as a wifi hotspot will not be good at is range (distance from the tower where you can have data service).

A phone broadcasts with very low power and has a tiny antenna....
Forum: General Discussion 10-21-2016, 12:58 PM
Replies: 49
Views: 5,737
Posted By tfmkevin
Hi Peter, The advantage of the solution we use...

Hi Peter,
The advantage of the solution we use (Max Marine) in making cellular data connections is pretty substantial. The radios in the router are superior to the radios in a typical cell phone....
Forum: General Discussion 10-20-2016, 03:54 PM
Replies: 49
Views: 5,737
Posted By tfmkevin
We may not be the "normal" case, but we both work...

We may not be the "normal" case, but we both work full time, probably 35-60 hours per week online, running an internet business.

Before the internet - well, we'd have different jobs, and perhaps...
Forum: General Discussion 10-20-2016, 02:04 PM
Replies: 49
Views: 5,737
Posted By tfmkevin
We are able to boat because we are able to stay...

We are able to boat because we are able to stay connected. We run a business full time, and we are still able to be on the water more than half the year. Without WiFi on the water, we'd be relegated...
Forum: Electrical and Electronics & Navigation 10-20-2016, 12:52 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
Really good point! I think I'll experiment with...

Really good point! I think I'll experiment with walking the re-bulk voltage back a tenth at a time, and see what that does in terms of letting the pack settle back to a more comfortable SoC on shore...
Forum: General Discussion 10-20-2016, 12:40 PM
Replies: 49
Views: 5,737
Posted By tfmkevin
I agree with a lot of what's been said above. In...

I agree with a lot of what's been said above. In SE Alaska, AT&T is BY FAR the best option. Verizon and T-Mobile are almost useless except in and around a few towns. We have spent both of the past...
Forum: Electrical and Electronics & Navigation 10-19-2016, 03:29 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
CMS - great points! Correct, voltage is not...

CMS - great points!

Correct, voltage is not a good indicator of SoC - particularly on lithium with their very flat voltage curve.

The way we are set up to charge with our shore charger is:
...
Forum: General Discussion 10-17-2016, 12:34 AM
Replies: 156
Views: 12,432
Posted By tfmkevin
We use Nespresso on our boat, and in our...

We use Nespresso on our boat, and in our Airstream trailer. We've spent about 500 nights aboard the boat and probably have 2-3 cups per person per day. We've spent over 750 nights in the Airstream...
Forum: Electrical and Electronics & Navigation 10-13-2016, 09:30 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
Pete - VERY sorry about the dinghy incident. We...

Pete - VERY sorry about the dinghy incident. We were listening to that unfold on the radio as we left Walker Cove... Glad nobody was hurt!

You are absolutely correct about the freezer space issue!...
Forum: Electrical and Electronics & Navigation 10-13-2016, 03:25 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
Way too much technical info about charging lithum

That's a VERY good point, and perhaps it warrants some explanation - at the risk of being too technical and writing way too much.

There are several things to consider when maintaining and charging...
Forum: Electrical and Electronics & Navigation 10-13-2016, 12:37 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
@Trundlebug - Your two-tank system sounds...

@Trundlebug - Your two-tank system sounds interesting!

Unfortunately, there is zero available space in our Nordic Tug 34' engine room to add even a slightly larger water heater. In fact, when we...
Forum: Electrical and Electronics & Navigation 10-10-2016, 03:04 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
One more note on the "cost" part of the...

One more note on the "cost" part of the equation...

4 Lifeline GPL-4CT 220Ah 6V AGM batteries (the max that fits in our limited space) would cost $315 each - so $1260 for a set. That would give us...
Forum: Electrical and Electronics & Navigation 10-10-2016, 02:52 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
Well, this is gonna blow my nerd credentials...

Well, this is gonna blow my nerd credentials right out of the water but... I don't know what regulator we have.

(hangs head in shame as propeller beanie spins slowly to a halt)

It's the stock...
Forum: Electrical and Electronics & Navigation 10-10-2016, 01:28 PM
Replies: 42
Views: 5,806
Posted By tfmkevin
As we said, about half of that 450Ah is running...

As we said, about half of that 450Ah is running the water heater full time (which is really just a convenience - nice to have hot water when you turn on the tap, and not be turning breakers on and...
Forum: Electrical and Electronics & Navigation 10-10-2016, 11:12 AM
Replies: 42
Views: 5,806
Posted By tfmkevin
Hi all, I wrote the article in question, so I...

Hi all,
I wrote the article in question, so I thought I'd pitch in with a few comments:

First, we understand lithium is well in the "early adopter" stage for boats. I'm an electrical engineer by...
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