Wow, this all makes my eyes glaze over! I’m old and was a humanities major. Please be gentle!

What size panel should I get to recharge a Sears Die Hard Platinum Portable Power 1150

12 volt battery? I’m getting one as emergency back up power for a cpap machine.

I think you are saying that a battery shouldn’t be allowed to get to less than 50%. How long would it take to recharge a battery from 50% to 100%?

Thank you!

]]>10% of 2AC amps = 0.4DC amps? Shouldn‘t this be 0.2DC amps added to 20DC amps (20.2 amps)?

So 2AC amps=242.4DC watts. Did you mean to use a 20% inefficency adder instead?

1 Amp AC = 10 Amps DC. (example, 2AC amps =20DC amp)

Add 10% (20.4 amps)

DC amps x 12v = DC watts. (20.4 ×12 =244.8 watts)

]]>i have a battery with specs 12V 7.0AH Cycle use 14.5-14.9V stand by use 13.6-13.8 and initial current is less than 2.8A..

And i am having a solar panel is of 12V 4W…

How can i charge the battery with this solar panel?

How much time it will take to charge the battery?

I am running 100LED‘s of 3.5V 20mA?

Please suggest me how the thing will work because i need the bed should be able to work even in nights mmm its almost 15 hours a day i want the led turned on…

Appreciate your help….

thank you ]]>

Thanks in advance for the help!

]]>I have a spare diesel car battery (12V ~100A). I would like to use it for lighting and/or cooking. What are my best options? Use 12V appliances or buy an inverter and hook into it something 240vish?

I am thinking of connecting the battery to a trickle charger.

Thanks & regards,

Mark

]]>ive got…. one 110 ah deep cycle battery , 30a charge controller , 500w inverter , an 5 solar panels at 11.13v each -(minimum everyday)linked pos neg in connection box going in my charge controller at 12.06v too 12.68 no higher, i run six 11 watt lights at 230 volts from inverter,

ive asked lots of people but no one knows my question is,

why does my battery start on 12.67v then soon as i switch lights on it drops to 12.21v an falls 8v first few hours, 6v after then steady 5v every hour till i switch it off after 6 hours give or take (battery now on 11.73 ish)i need it at lease 8 hours a day,

anyone helps ill give a big pat on back

]]>I wonder how or where to get the Worst Weather Factor of 1.55?

Please advise.

Regards

]]>Is this configuration sufficient to keep my system running 24/7/365. ]]>

I did use your calculator but still i have confusion about #3 Total watts per hour (DC) where can i get this DC watts?

53V x 3 Lights 7 hours a day

37V Wi Fi 24 hours a day

500W O/S 19 hours a day

I will use 12V 600Ah battery, 240W solar panel. #14 2days backup power required #22 6 sun hours per day

Thanks a lot for your help.I am glad to find your website.

]]>T = (C/((I/(C/R))^n) * (R/C))

{it\‘s the theory that is hard to beat}

Power 420 watt

Ampere 840

volt 100

who many things i can run plz tell me in detail

Can i run TV, fan, energy saver etc]]>

Power 420 watt

Ampere 840

volt 100

How many things can i run with this power

Can i run TV, Energy saver, fans etc….

i have a ups of 2000 watt and two butteries can i charge these butteries using ups. ]]>

These cells have following specifications

Power 4.2 watt

Ampere 8.4

volt 0.5

sir if i buy 100 piece i get 420 watts how many things i can run with this power

can a charge a ups with it or not

please tell me in detail

thanks in advance ]]>

i want to buy solar panels of these specifications

6 by 6 inch Mono crystalline solar cells 4.2 watt each(Solar eneger)

These cells have following specifications

Power 4.2 watt

Ampere 8.4

volt 0.5

do you understand or not]]>

from all the above things who many things i can run same time. ]]>

we want to have battery backup of 1500 amp , 48 v (hupsolar one battery, lead acid )

how long would it take for the grid to charge the battery 50 hz, 600v transformer

and how long would it take a generator to charge the 400 kw.]]>

I want to buy solar system for my house needs to run AC,1fan,Refrigirator, Can you please suggest howmany Watts/A/Volts in each required to meet these specification,battery capacity,panel capacity,howmany panels best and day time how can I use direct power without using batteries etc. Please provide all the required if I missed any thing about this as my vendor is going to visit my place soon,once they fixed the setup pannels,battery etc it is not easy to ask them to change the setup. Can I go ahead with upgrade to existing setup like If I will set up 100W, Can I add another 100w to existing system?

]]>sun hours would be around 6-7hrs(caribbean area) and pump runs 24hrs. inverter is 1000w capacity.

cheers

]]>Need to know what size solar panel would do this :

A 12 volt battery connected to 400 watt, 3.3. Amp power inverter to a device drawing 2 amps.

Would a 18 Watt , 8 Amp solar panel be enough to keep battery charged up ?….. with a avg. day sun light ?. If not, what size solar panel in watts would be needed ?. Thank you

]]>I have two 150w solar panels and 140ah acid lead battery. Direct sunlight duration is about 10 hours. how much time solar energy will take to fully charge my battery?

]]>Due to the fact that we don’t have all the information for your system we would need you to contact us at tech@batterystuff.com so that we can ask the appropriate questions, to get you the answer that you may need.

]]>I have 2 car batteries of 110 amps each connected in parallel. How many solar panels and of what output do I need in order to charge this battery bank when it is at 50% discharge? How long will these panels take to charge the batteries bank to 100% considering they are not providing power to consumers during the charge period and that the panels are exposed to 8 hours of direct sunlight a day and that a controller is connected to the system?

Thank you]]>

The appliances I have are a milk steamer, shaved ice machine, small brewer, and water pump.

The brewer and water pump have to run at the same time. The others will run only one at a time.

These are the amp rating for the items:

Ice shaver- 3.4 amps (runs for about 5 minutes total per day)

Milk steamer- 1.8 amps (runs for 20 minutes per day)

Water Pump- 1.1amps (runs for 5 minutes max per day)

Coffee brewer- 19.6amps (start) 14 amps (continuous) (runs for 40-60 minutes per day)

All are 110-115 Volt

What size battery (batteries) would I need and what kind of inverter?

All the items only run when needed and not at the same time (except brewer and pump)

Also how long would the recharge take on a battery if it was plugged into a wall outlet in my home?

Thanks for your help, awesome site!

Due to the fact that we don’t have all the information for your system we would need you to contact us at tech@batterystuff.com so that we can ask the appropriate questions, to get you the answer that you may need.

]]>sir I have question about solar?

1-i have 20PC solar each one is 130W how many AC electricity I can make from IT?

2- how many inverter will require ?

3- how many battery will required?

4- from solar to battery how many controller will require?]]>

I have a 18 ahr SLA battery (within a Powertech 6 in 1 setup) that I am looking to get a solar panel for for use on camping trips. I am looking to put aprox 6 to 9 amps of power back into the battery per day. Would a 20 watt panel with a PV controller be a suitable setup? Anything I should be mindful of? Thanks in advance.

]]>TV = 38W

REFRIGERATOR = 297W

3nos CEILING FAN each of 75W = 225W

6nos BULB each of 5W = 30W I am using1200W, 12V Inverter with 2nos 100AH batteries in parallel. How can I calculate the running time before all charges is discharged if all the batteries are in good condition?]]>

Thanks again, Jim]]>