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inverter with dual (battery and utility) inputs? - Page 2

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Posted by Jim Wilkins on July 13, 2015, 9:29 pm
 

Can you name one?




Posted by ads on July 14, 2015, 7:39 pm
 
On Mon, 13 Jul 2015 17:29:31 -0400, "Jim Wilkins"


Not sold as a battery charger, but banggood.com  has a voltage
regulated, current limited power supply (up to 30 volts, up to 5 amps)
for about $0US.  

The voltage can be set to the hundredth of a volt (batteries are
usually fine with settings to the tenth of a volt).  The current limit
can also be set finely, but in this application would likely be set to
its maximum value.

You should be able to parallel units for higher current.  I haven't
yet needed to do that.

I've used one for testing Peltier effect coolers.  It starts getting
too warm to touch at loads of 50 watts and up, but that is easily
remedied by a small 12 volt fan (think computer power supply or case
fan).

Posted by Jim Wilkins on July 14, 2015, 9:55 pm
 
Read this warning about charging batteries with the Mastech and Volteq  
brands of Chinese power supply.
http://www.mastechpowersupply.com/linear-vs-switching-power-supply.html  

I put a diode in series to protect the power supply regulator from the  
battery if the grid fails.

-jsw  



Posted by Ron Rosenfeld on July 23, 2015, 12:52 am
 

If you want to "ease into solar", and are grid-connected, why do you need batteries?

The only reason I am aware of would be to provide standby power in the event of a grid outage.  Otherwise there is no need for batteries -- just get a grid-tied inverter.

If you want to provide backup for your house, I suspect a fossil-fueled generator will be more cost-effective than a solar powered battery bank.

Posted by Vaughn on July 23, 2015, 1:20 pm
 On 7/22/2015 8:52 PM, Ron Rosenfeld wrote:

In most cases I agree, which is why I have a natural gas powered  
generator.  That said, if you do the math you will see that over a long  
outage a fossil-powered generator can drink an amazing amount of fuel.  
Operated 24/7, my little Onan could easily give me a $000 gas bill!

Properly designed and thought out, a solar system can provide power  
year-around, not just during an outage.  Mine isn't grid-tied, but it  
lights my yard lights year-round and supplies some of my home's internal  
lighting.


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