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Forum: Electrical and Electronics & Navigation 10-08-2018, 09:00 AM
Replies: 7
Views: 244
Posted By john61ct
I agree with the "should". I like a...

I agree with the "should".

I like a "nav/essentials" circuit that can be switched from one to the other bank as needed.

Rest of House loads on LVDs to ensure it's not drawn down too far by...
Forum: Electrical and Electronics & Navigation 10-05-2018, 03:39 PM
Replies: 8
Views: 444
Posted By john61ct
Video says equivalent to six passengers breathing

Video says equivalent to six passengers breathing
Forum: Electrical and Electronics & Navigation 10-04-2018, 08:04 AM
Replies: 8
Views: 444
Posted By john61ct
Bit hard for many boats that are rarely level.

Bit hard for many boats that are rarely level.
Forum: Electrical and Electronics & Navigation 10-01-2018, 04:08 PM
Replies: 8
Views: 444
Posted By john61ct
Roadtrek demonstrates WATT Fuel Cell Technology

Direct generation from propane, no combustion

https://youtu.be/naQk7RrWUdI
Forum: General Discussion 08-13-2018, 11:35 AM
Replies: 60
Views: 1,849
Posted By john61ct
Again people, watts per hour is not right, nor kW...

Again people, watts per hour is not right, nor kW nor amps.

Watt-hours, kWh and AH are the only units make sense "per" unit of time - running "for an hour" or "over an hour" is very different from...
Forum: General Discussion 08-13-2018, 06:23 AM
Replies: 60
Views: 1,849
Posted By john61ct
You just can't say "something used X amps" over a...

You just can't say "something used X amps" over a time period, only AH.

"It is **now** using X amps, and **now** using Y" makes sense,

amps is a flow rate, not a quantity of energy.

Say...
Forum: General Discussion 08-12-2018, 08:24 PM
Replies: 60
Views: 1,849
Posted By john61ct
Nit to pick. Watts, therefore kW, also amps,...

Nit to pick.

Watts, therefore kW, also amps, are an instantaneous measure, often varying every minute, or on/high vs off/low for a certain ratio of time.

Average energy used per unit of time is...
Forum: General Discussion 08-07-2018, 03:53 PM
Replies: 60
Views: 1,849
Posted By john61ct
Yes, in re-reading from the beginning, the whole...

Yes, in re-reading from the beginning, the whole system is designed for shore power, which is always cheaper than solar / DC.

If you want to go mostly-solar you need to put in much more efficient...
Forum: General Discussion 08-06-2018, 05:46 PM
Replies: 60
Views: 1,849
Posted By john61ct
I would rely on mains, bank as a fallback for...

I would rely on mains, bank as a fallback for outages, shut down the heavy consumers as much as possible while away, go more "voluntary simplicity" provision for each trip out.

Next choice capital...
Forum: General Discussion 08-06-2018, 03:49 PM
Replies: 60
Views: 1,849
Posted By john61ct
Sorry if I missed it, but are you leaving your...

Sorry if I missed it, but are you leaving your boat on the hook for days or where shore power is available?

If the latter then should no issue with a good marine charger.
Forum: General Discussion 08-06-2018, 01:39 PM
Replies: 60
Views: 1,849
Posted By john61ct
If you are running off batteries + solar for more...

If you are running off batteries + solar for more than a day or two at a time,

You really should get as hyper-efficient a fridge & freezer as possible, ideally 12V native rather than going through...
Forum: Electrical and Electronics & Navigation 08-02-2018, 07:40 AM
Replies: 124
Views: 4,410
Posted By john61ct
It is not proven that a float voltage lower than...

It is not proven that a float voltage lower than batt's resting V does not harm longevity.

It has not been proven that it does either.

It is certainly not "the same" as being isolated, and for...
Forum: Electrical and Electronics & Navigation 07-28-2018, 04:04 PM
Replies: 124
Views: 4,410
Posted By john61ct
÷8 = 3.5Vpc, good, not too high. > Float...

÷8 =
3.5Vpc, good, not too high.

> Float is another area where I scratch my head. I've heard people say to charge to a certain voltage/return current, then STOP. And I have heard people also...
Forum: Electrical and Electronics & Navigation 07-27-2018, 10:14 PM
Replies: 124
Views: 4,410
Posted By john61ct
1. Are you defining Full at 3.60Vpc as a....

1. Are you defining Full at 3.60Vpc as

a. charging setpoint ?

get there and stop ?

some endAmps spec?, or

resting voltage after isolation?
Forum: Electrical and Electronics & Navigation 07-26-2018, 07:37 PM
Replies: 124
Views: 4,410
Posted By john61ct
At two decimal points, you'll get some...

At two decimal points, you'll get some variability depending on charge rates.

AH-counting is better for measuring SoC on the way down.

On the way up, all that really matters is stopping at...
Forum: Electrical and Electronics & Navigation 07-26-2018, 07:34 PM
Replies: 124
Views: 4,410
Posted By john61ct
Conservative in this case means staying away from...

Conservative in this case means staying away from the shoulders

Lower V at the top, higher at the bottom.

10%-97% rather than 5%-99%.

Shoot for 20+ years, calendar aging wins rather than...
Forum: Electrical and Electronics & Navigation 07-26-2018, 07:10 PM
Replies: 124
Views: 4,410
Posted By john61ct
Just meant that your > 400A going into a...

Just meant that your

> 400A going into a 720ah bank, which is C/1.8

will not in itself do harm, long as you have good overtemp protection.

.4C is routine.

Now, for longevity, I would use...
Forum: Electrical and Electronics & Navigation 07-26-2018, 04:06 PM
Replies: 124
Views: 4,410
Posted By john61ct
Those rates are no issue, long as the wiring is...

Those rates are no issue, long as the wiring is sound, check for heat is all.

1C is actually conservative for LFP, while most AGM won't accept that long at all if ever
Forum: Electrical and Electronics & Navigation 07-26-2018, 09:02 AM
Replies: 124
Views: 4,410
Posted By john61ct
The demand for LFP will keep prices high. ...

The demand for LFP will keep prices high.

The supply of the metal lithium itself is not an important factor in the pricing of batteries.

Certainly nothing to do with the medication.Christmas!
...
Forum: Electrical and Electronics & Navigation 07-22-2018, 06:58 PM
Replies: 124
Views: 4,410
Posted By john61ct
I thought you meant cell manufacturers. ...

I thought you meant cell manufacturers.

Quote right from that page:

If your cells rest at room temperature for 3+ hours with no load and wind up at 3.4VPC they are full. Getting them full does...
Forum: Electrical and Electronics & Navigation 07-22-2018, 12:54 PM
Replies: 124
Views: 4,410
Posted By john61ct
And what US manufacturer are you talking about? ...

And what US manufacturer are you talking about?

wrt charging voltages I have yet to see any one worldwide specify as low as what CMS recommends.

My (conspiracy) theory is that manufacturers...
Forum: Electrical and Electronics & Navigation 07-22-2018, 12:52 PM
Replies: 124
Views: 4,410
Posted By john61ct
That's funny, I would be very interested to be...

That's funny, I would be very interested to be informed where anything I've written conflicts with CMS / Maine Sail. I usually get accused of following his reco's too slavishly 8-)

I've certainly...
Forum: Electrical and Electronics & Navigation 07-22-2018, 11:09 AM
Replies: 124
Views: 4,410
Posted By john61ct
I completely agree that you can trust yourself to...

I completely agree that you can trust yourself to regulate the charge profile yourself manually. I was just stating that I cannot.


Which is much higher than what those striving for longevity...
Forum: Electrical and Electronics & Navigation 07-22-2018, 10:58 AM
Replies: 124
Views: 4,410
Posted By john61ct
Nothing I say is wrt any one individual. Of...

Nothing I say is wrt any one individual.

Of course there are exceptions that prove the rules.

The target for my statements is relatively newbie readers coming across the thread while doing...
Forum: Electrical and Electronics & Navigation 07-22-2018, 10:54 AM
Replies: 124
Views: 4,410
Posted By john61ct
By professionals is different from DIY. DIY...

By professionals is different from DIY.

DIY may or may not be done "in a professional manner", what does that even mean?

Yes if your insurer doesn't require a survey, and your system is not the...
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