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Search took 0.00 seconds. Search: Posts Made By: sailingharry
Forum: Electrical: Batteries, Generators & Solar 08-11-2021, 06:13
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

You have found two drop-ins that show Wh. Seems to be a European thing - they aren't available in the US.


However, I'm not sure what they are "really" rated in. The way the info is presented,...
Forum: Electrical: Batteries, Generators & Solar 08-11-2021, 06:03
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Thanks. It's nice to hear another rational voice! My pseudo-explanation a few days ago omitted the chemical reaction and consumption of the electrolyte, it still showed the direct storage of...
Forum: Electrical: Batteries, Generators & Solar 06-11-2021, 17:56
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Can you point to any LFP batteries suitable for marine use with spec sheets in kWh? Both BattleBorn and Winston only list Ah. And even flat LFP voltages require some assumption of average voltage.
Forum: Electrical: Batteries, Generators & Solar 02-11-2021, 18:57
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Inverters (specifically inverter chargers) are the real oddball in units. Across home and boat, units are mixed (my toaster is in watts, my central A/C is in amps), but inverter chargers are...
Forum: Electrical: Batteries, Generators & Solar 02-11-2021, 14:25
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Except no one has explained HOW energy is stored in a battery, and refuted my concept that it is a direct result of a one-to-one transfer of atoms from one electrode to the other, and the associated...
Forum: Electrical: Batteries, Generators & Solar 02-11-2021, 13:10
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Good on you for fitting a shunt. Most folks that brag about their output, when you ask for details, admit they have no idea.


I use a shunt-less ammeter, a nifty Hall Effect non-contact device. ...
Forum: Electrical: Batteries, Generators & Solar 02-11-2021, 05:53
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

You are correct, Ohms law applies in all cases. And you are correct, the same amount of energy is being put in. The problem is at higher charge rates, a higher percentage of the charge goes to...
Forum: Electrical: Batteries, Generators & Solar 02-11-2021, 05:42
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

This conversation has got me thinking about that, and I think I have the answer.


I think that fundamentally, without regard to what the units are useful for, that a battery does not store "W." ...
Forum: Electrical: Batteries, Generators & Solar 02-11-2021, 05:26
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Your units are making my head spin. LOL. All my instruments are in A, so I'm having to convert my experience to your numbers. :smile:


But that said,
800Ah in LFP is closer to 10.5 kWh, isn't...
Forum: Electrical: Batteries, Generators & Solar 01-11-2021, 13:57
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Stu,


I did look at F04, and it is kind of baffling. As you point out, it shows Ah vs kWh. But that is the integrated value. It does NOT show W. Or at least, the manual doesn't say it does --...
Forum: Electrical: Batteries, Generators & Solar 01-11-2021, 13:44
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

My battery is 800 Ah (actually, it's 780 -- but given the sloppiness of this math anyway, I use 800), and so I try to limit discharge to 400Ah. My fridge uses about 125Ah/day when left alone (it is...
Forum: Electrical: Batteries, Generators & Solar 01-11-2021, 05:53
Replies: 129
Views: 10,889
Posted By sailingharry
Smile Re: Rethinking power management

For future reference, you now have!:smile: Because I have nothing on my boat that can measure W, I mentally convert my wind and solar to A. It's not like I've written it down, but I know that my...
Forum: Electrical: Batteries, Generators & Solar 31-10-2021, 13:56
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Jedi


Let me start by saying I did not mean to offend by "Wh crowd." The intent was not to disparage either side as less knoweldgeable as the other, but rather to recognize that there are those...
Forum: Electrical: Batteries, Generators & Solar 30-10-2021, 12:50
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

After I made my last post, I sat back and realized that arguing the relative merits of Ah and Wh is silly in the extreme. Both are crude approximations at best, both give about the same data. In the...
Forum: Electrical: Batteries, Generators & Solar 30-10-2021, 12:18
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Actually, VA is NOT power. VA*PF is power (PF is Power Factor). For DC, PF is 1. For AC resistive loads, PF is 1. For reactive loads (battery chargers, rotating machinery, mainly), PF can be .7...
Forum: Electrical: Batteries, Generators & Solar 28-10-2021, 19:40
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

* Your units and math are spot on. And nearly identical to what we experienced for 110 days this summer on our 43' sailboat.


* Your solar results are almost identical to ours (4 90W...
Forum: Electrical: Batteries, Generators & Solar 28-10-2021, 15:38
Replies: 129
Views: 10,889
Posted By sailingharry
Re: Rethinking power management

Units, please! You can't have a discussion about energy when the units are wrong!


What is a "watts/hr" (for the oven?).
A washer may require 800W to operate, but for how long? For 30 minutes?...
Showing results 1 to 17 of 17

 
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