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 > what voltage for the 'house'?

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pianotuna

Regina, SK, Canada

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Posted: 06/04/21 06:35pm Link  |  Quote  |  Print  |  Notify Moderator

Hi all,

https://getlitbatteries.com/12v-vs-48v-w........kKwaikqhOzaeCbBJpf1yop08JTvjuhBVcnEJ7qVo


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 06/04/21 06:45pm Link  |  Quote  |  Print  |  Notify Moderator

Years ago I worked on 120+ volt DC systems. Series string 3 cell and even single cell batteries. Every voltage has its positive and negative advantages. Chuckle.

pianotuna

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Posted: 06/04/21 08:06pm Link  |  Quote  |  Print  |  Notify Moderator

Mex,

I could not agree more.

CA Traveler

The Western States

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Posted: 06/04/21 08:09pm Link  |  Quote  |  Print  |  Notify Moderator

A very few RVers have a 48V solar, inverter, charger and battery. And a 48V to 12V DC to DC for the house.

My Morningstar solar controller is limited to 60A output. That's 60*12 = 720W for a 12V output. If I switched to 48V then the limit is 60*48 = 2880W for that controller.

While 2880W is a lot of power for boondocking, not so much for utility power:
a 20A utility plug is 2400W, 30A is 3600W and 50A is 12000W available 24/7.

Update: Per suggestion the above voltages are generic for comparison and actual battery charging voltages vary based on a number of factors including battery temperature. [emoticon]

* This post was last edited 06/05/21 09:20am by CA Traveler *   View edit history


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2oldman

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Posted: 06/04/21 10:16pm Link  |  Quote  |  Print  |  Notify Moderator

Cool

MrWizard

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Posted: 06/05/21 05:30am Link  |  Quote  |  Print  |  Notify Moderator

Bob , don't you mean 60a*14v 840 watts
You know you can't charge 12v battery with 12v,bit requires a voltage, above battery nominal full charge which is 12.6v,
A fully charged fla battery should read 13+v when charging is turn off


I can explain it to you.
But I Can Not understand it for you !

....

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BobsYourUncle

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Posted: 06/05/21 07:17am Link  |  Quote  |  Print  |  Notify Moderator

Great article Don, thanks for posting.

I like the SXS comparison in easy to understand language.

I have been following solar and optimum configurations for a while, wanting to learn more, as we want to build an off grid support system for our Tango.

This article helps a lot.

Not a cheap venture at 4500 bucks for a battery! I'm sure the price will come down as more things like this become widespread in use.

Good stuff. [emoticon]


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CA Traveler

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Posted: 06/05/21 08:49am Link  |  Quote  |  Print  |  Notify Moderator

MrWizard wrote:

Bob , don't you mean 60a*14v 840 watts
You know you can't charge 12v battery with 12v,bit requires a voltage, above battery nominal full charge which is 12.6v,
A fully charged fla battery should read 13+v when charging is turn off
Of course but the post was intended to emphasis the difference between 12V and 48V in terms of the controller output and the nominal solar panel wattage. But perhaps I should have qualified these are the generic voltages and I have now updated the post.

In that context what voltage would you suggest? 14.0, 14.4, 14.8, 56.0, 57.6, 59.2 or some other voltage which is dependent on the various mfg specs, not to mention that the voltage is also temperature dependent.

Or the commonly used terms of 12 or 48 volt battery systems. There is no one size fits all.

* This post was edited 06/05/21 08:55am by CA Traveler *

2oldman

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Posted: 06/05/21 10:09am Link  |  Quote  |  Print  |  Notify Moderator

Keeping the amps as low as possible was my goal. Wire handles voltage much better than amperage.

pianotuna

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Posted: 06/05/21 12:08pm Link  |  Quote  |  Print  |  Notify Moderator

BobsYourUncle wrote:



Not a cheap venture at 4500 bucks for a battery! I'm sure the price will come down as more things like this become widespread in use.

Good stuff. [emoticon]


Hi Bob,

Thanks.

As you probably know I'm in the SiO2 camp due to cold weather. I'll have more than 7 kwh based on 80% depth of discharge.

If you have a couple of years wait time, you may want to consider Aluminum Ion batteries. They charge 60 times faster than Li and are 3 times the energy density.

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