Comments on: Solar Calculator Tutorial

By: Raymond Suarez

Raymond Suarez — Sat, 12 Nov 2022 23:27:41 -0800

I have 2 panels rated at 240w, 30.2v, 7.95A wired in parallel and have them hooked to 60 amp controller, then hooked to 6- 35ah batteries so they are wired to 210ah and then run a 1500 pure sign inverter. I live in AZ so I get a lot of sun maybe average 10 hrs a day of sun all year round. My controller says I am getting in about 50 watts and 14.4v. Is this the best way to get the most out of my solar panels?

By: Saclinto

Saclinto — Tue, 30 Aug 2022 07:34:45 -0700

Hey someone please I use a 3500 inverter so please what how many batteries do I need to run my 3500 inverter for 10 hours each day ????

By: Frank Miles

Frank Miles — Thu, 21 Jul 2022 04:05:23 -0700

I have 8 x 6 volt 550 Mp batteries. I want end up with 24 volts 550 amps. How do I connect them

By: Engine Oil Filling Machine

Engine Oil Filling Machine — Tue, 16 Jun 2020 00:11:56 -0700

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By: Machine de remplissage de mayonnaise

Machine de remplissage de mayonnaise — Wed, 10 Jun 2020 01:34:09 -0700

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By: Jimmy

Jimmy — Thu, 19 Jan 2017 07:14:24 -0800

Really good information! Thank you sir. If I may ask a question. I have made a giant 12v battery from some saft 1.2v cells. 9p10s @ 270 ah, if my newbie math is correct. If this was a normal set up I think I could do the math but it’s different. You think a 400w panel bundle would keep this thing charged?
Thanks again, Jim

By: farouk

farouk — Mon, 04 Jul 2016 04:01:26 -0700

i am trying to power up 1000 watts of eneregy all of them in total are lights ,i have a 2000wat inverter and two bateries 12 volt 120ah ,my question is how many solar panel i need to charge these batteries on a daily basis or do i need to purchase more bateries my lights are on 12 hours daily , thank you e7

By: Emme

Emme — Tue, 28 Jun 2016 22:13:56 -0700

Hello!
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!

By: Douglas S. Duran

Douglas S. Duran — Thu, 23 Jun 2016 07:00:40 -0700

Good day sir. how much solar panel will i use to power up a 2500 watts load? that can work for 12 hours of operation with that amount of load? how much solar panels, the size of inverter, and the size of solar charge controller, and the battery? thank you and god bless you always.

By: Jorgen

Jorgen — Mon, 13 Jun 2016 07:40:35 -0700

Hi
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

By: sohail

sohail — Fri, 20 May 2016 19:29:11 -0700

hi.i have a 60ah dry cell batry and 2 Toyota corolla radiator 12 fans so what kind of solar panel should i need for running fans 6 hours in day and 6 hours in night? thank you

By: sheraz

sheraz — Sat, 23 Apr 2016 00:11:13 -0700

Dear Team,

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?

By: Michael

Michael — Sun, 20 Mar 2016 20:54:05 -0700

Hello guys I just want to ask how many watts solar panel dining need To use to fully charge my 12volts 32ah battery with in 7hrs…ty

By: Tech

Tech — Tue, 18 Nov 2014 10:10:18 -0800

I would suggest using our Calculator | AC to DC amperage conversion run through an Inverter. You don’t want to discharge a battery more than 50% or risk damaging the battery’s life. This calculator will tell you how much you are pulling from a battery in an hour.

By: IBRAHIM K YUSUF

IBRAHIM K YUSUF — Mon, 13 Oct 2014 06:48:25 -0700

PLEASE, I HAVE THE FOLLOWING APPLIENCES IN MY HOME
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?

By: Mario

Mario — Tue, 16 Sep 2014 22:49:40 -0700

Hi guys

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.

By: barialai

barialai — Wed, 30 Jul 2014 02:57:35 -0700

hi
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?

By: Joshua

Joshua — Thu, 17 Jul 2014 08:46:26 -0700

I have a question: I run a mobile coffee truck and would like to add a deep cycle battery (or 2) for running my small appliances occasionally through the day with out having to run my generator.

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.

By: chris

chris — Tue, 15 Jul 2014 10:45:32 -0700

I have a 30 watt spotlight which will run from a 600 watt inverter for 10 hours and 2 × 10 watt lights which will run together for 5 hours from the same inverter. What size of panel, charge controller and how many batteries do i need.

By: Ramesh

Ramesh — Tue, 10 Dec 2013 08:30:36 -0800

Sir, I have an 25 Watts battery which should be running for atleast 12 hours an day. I have multiple 12V and 5AH solar panels. So, what is the battery specification I need to use for the above mentioned usage and also how many panels i need to use and we have an average of 10 hours sunlight a day

By: Enias

Enias — Sat, 23 Nov 2013 10:02:11 -0800

What is a correct charge controller and inverter which is equivalent to 130 watts solar panel plus 120Ah batteries

By: John

John — Sun, 07 Apr 2013 10:40:50 -0700

Please help with question and calculate :

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

By: Fitzroy

Fitzroy — Sat, 16 Mar 2013 15:13:48 -0700

If i use a 60watt 12v panel putting out about 3.5 amps what size battery should i use to power an AC water pump drawing around 80 -100watts.
sun hours would be around 6-7hrs(caribbean area) and pump runs 24hrs. inverter is 1000w capacity.

cheers

By: Cathy

Cathy — Tue, 19 Feb 2013 18:13:05 -0800

Hi sir, can a 60 watts solar panel can charge a 24 volts battery? We are working for our thesis but we have a problem because the lead acid battery is not charging, the capacity is 10Ah.

By: sunil

sunil — Sat, 16 Feb 2013 23:51:40 -0800

I have 5panel of 12&40watt con i directly connet to the inverter to get 240v

By: Mamatha

Mamatha — Thu, 14 Feb 2013 02:04:38 -0800

Hi Sir,

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?

By: mike

mike — Tue, 12 Feb 2013 11:48:24 -0800

i am planning a large system, k00kw solar.
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.

By: Howard Heath

Howard Heath — Tue, 05 Feb 2013 08:56:51 -0800

Shop and well wired for 220. Want to convert to solar power. How do I find out how big of a system I need? According to electric bill approx 55 kilowatt hours used last month. Concerned about burning up well.

By: sunil

sunil — Wed, 30 Jan 2013 06:02:26 -0800

can some body tall me ,ihave around 700 watt load in my house i have invarter 650 watt i want solar panal also for back up ,i need to know how big or how mouch watt soler panal need for charging 110ah 12 volt battery can gate 8 hours back up

By: ron

ron — Mon, 28 Jan 2013 16:26:49 -0800

trying to use a solor pannel to run a heater element like to use the 12 volt pannel can you hook it up direct say a 100 watt pannel what size heater element could i use

By: Naeem

Naeem — Fri, 18 Jan 2013 19:57:32 -0800

sir we have refrigerator, tv, and fans, energy saver 24watt
from all the above things who many things i can run same time.

By: Naeem

Naeem — Fri, 18 Jan 2013 09:37:30 -0800

sir
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

By: Naeem

Naeem — Fri, 18 Jan 2013 09:34:02 -0800

sir solar panels

By: Naeem

Naeem — Thu, 17 Jan 2013 18:45:37 -0800

*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
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

By: Naeem

Naeem — Thu, 17 Jan 2013 06:48:12 -0800

Sir i have a Question
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.

By: Naeem

Naeem — Thu, 17 Jan 2013 06:40:40 -0800

Sir my Question is that if i have
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

By: Dharmendra Malviya

Dharmendra Malviya — Wed, 09 Jan 2013 05:27:49 -0800

can i ues 220amp tubular battery on my solar system. my system have1kw.

By: Lance

Lance — Wed, 26 Dec 2012 23:29:30 -0800

I gave a rating of 3 on this article, because while knowledge may be present, it is also presented as a 10th grade science presentation, instead of an Electrical Technician format. I worked as the Director of Engineering for a major RV manufacturer for years, and one of our greatest headaches was DC power systems and regeneration systems. We installed solar panels, grid-tie-in converters with battery chargers and conditioners, generator power transfer systems, and serial-parallel battery bank systems; all in the name of meeting the customer\‘s demand for wanting 24-hour power at megawatts per pennies. As a result of this, we spawned a complete RV electronics sub-group within our engineering department to address battery construction, demand and regeneration vectors, as well as complete \‘working system\’ analysis to determine system configuration around specific customer \‘lifestyle\’. I say all this, because in the beginning, one of the things that beat us to death until we better understood it was the effect of Peukert\‘s Curve on our DC power system efforts. I\‘ve played with your calculator a bit, and I\‘m not quite sure you are compensating for the Peukert effect in your calculations (the result is either rounding, or not staying consistent versus my calculator). Your \‘n\’ value is definitely set higher than the efficiency of most deep cycle batteries, and I am not sure you are taking into effect actual \‘total depletion\’ versus \‘real world depletion\’ rates as a function of cell life. You also don\‘t address the function of temperature on both charge and discharge, nor do you offer any temperature compensation variables (I\‘m not talking 5°F here, but the difference between discharging at 32°F and charging at 72°F, etc.). It also appears you didn\‘t take into account the 10-hour rule in \‘fast-rate\’ charging (which can be somewhat overlooked with \‘more exotic\’ cells, such as AGM and jell-types).

T = (C/((I/(C/R))^n) * (R/C))
{it\‘s the theory that is hard to beat}

By: Solar Air Conditioner

Solar Air Conditioner — Tue, 25 Dec 2012 09:08:49 -0800

I have read somewhere about solar calculator, but was not fully aware about how it works. The instructions given helped me to understand it better. Thanks for this very well explained information.

By: Scott

Scott — Tue, 04 Dec 2012 08:50:31 -0800

If i have a 24 V 32 Amp hour batter supplying power to something which requires 24V 5amp how long will the battery last?

By: BEN

BEN — Sat, 24 Nov 2012 09:29:51 -0800

how many 1kw solar panels required to electric vehicles like NISSIAN LEAF.It has a motor running at 80kw with lithium ion batteries of 24kwh and on board charging required is 3.3kw.what value should i consider for running of the vehicle?

By: nihon

nihon — Mon, 19 Nov 2012 20:57:55 -0800

Thanks sir for your answer.
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.

By: nihon

nihon — Sun, 18 Nov 2012 21:47:43 -0800

I am new to solar system and i would like to know.. 53V X 3 Lights, 37V Wi-Fi and 500W oparation system. I want to run this all 19 hours a day. How many watts solar panle, how many Volt and amp battery, Inverter, controler do i need? to run this 3 things well for all season. looking forward to hear from you. thaks a lot.

By: Lutz

Lutz — Sat, 17 Nov 2012 11:16:50 -0800

I have a system drawing 700ma 24v for 24 hours a day. I use 2×12v 90ah gell batteries in series and 2× 130watt 12v panels in series to keep the batteries charged.
Is this configuration sufficient to keep my system running 24/7/365.

By: Ham DIYer

Ham DIYer — Mon, 22 Oct 2012 06:54:10 -0700

Hi, I am a bit confused. I want to continuously run a small remote router which runs at .24A DC from a 12v source. Using your calculator it would seem that a 7aH 12V battery and a 5 watt panel would do the trick and give me several days of reserve. Plugging .24 into the first box works. But then I see the “x12” in the description. Is that just for AC? or should my number be 2.88 in which case I need a much larger system. Size counts. I want to keep this as compact and light as I can. Thanks.

By: iqbal singh

iqbal singh — Mon, 15 Oct 2012 00:33:25 -0700

hey i want to have some more of knowledge about solar power. is there any way that i could talk to you nd clear my doubts. i need it very urgently as i am working on a solar project and want to have more technical details. so plzz i need you to give some of ur valuable time. thanks.

By: David

David — Tue, 25 Sep 2012 00:45:49 -0700

Hi, i want to run 4 × 30W LED flood lights for 5 hours a night, i want to run a 12vdc solar system to run them, how many amp hours of battery should i have, and how many watts solar system would i need to fully recharge battry every day and allow enough in reserve for cloudy days etc etc./

By: jj

jj — Fri, 17 Aug 2012 09:03:06 -0700

I am purchasing a home with 1860 watts of solar, 24 volt system charging 16 trojan 6 volt batteries in series. will this keep everything running except for the furnace, (will use wood heat)?no electricity availible, owners have been using this system for 10 years with upgrades they have 2 referagerators running and one freezer

By: F

Sun, 22 Jul 2012 05:00:05 -0700

Hello Guys,

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

Please advise.

Regards

By: Beginner

Beginner — Tue, 03 Jul 2012 04:39:12 -0700

What is high rate battery? Its hard to get true solar batteries locally so we have been using with a UPS battery sealed lead acid battery (Unigy HR1500) which is described a high rate battery of with a 33 Amp hour rating.

By: RICH

RICH — Mon, 11 Jun 2012 14:44:39 -0700

hi, no one seems to know what their on about on other sites intill i seen this one, i need some help please ,

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

By: Mark

Mark — Wed, 30 May 2012 05:48:45 -0700

Hi. Your website is so informative. Thanks a lot for that.

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

By: Bo

Bo — Sun, 27 May 2012 18:12:15 -0700

I need help. I want to run a small off the grid cabin. I currently have 8 12volt 100amp deep cycle batteries, 1 60watt solar panel, 1 charge controller and a Tripp Lite PV2000FC DC to AC converter. I want to run a small Frigidaire 5000BTU air conditioner rated at 565 watts and 1 60 watt incandescent light bulb for two consecutive days (approx. 6-7 hours per day). I\\\‘m having issues where the Tripp Lite PV2000FC starts showing low power after a few hours on the first day then turns off the power. What do I need or what is wrong with this setup?

Thanks in advance for the help!

By: Asad

Asad — Wed, 16 May 2012 03:34:06 -0700

Hi, I have 4 solar panels 130 watt each, 2 in series. My battery and inverter system is 24 volt. at peak it produces 8.2-8.4 amperes. I have two 180 ampere batteries in series. Solar panels charge the consumed battery in 2-4 hours. The rest of the day the house runs on direct out put saving the battery current for the night. The question is how much energy can I spend at day time without any loss from batteries.

By: HPC

HPC — Thu, 10 May 2012 04:02:03 -0700

Hi, interested in learning more about solar power, and that\\\‘s how I found you….. I\\\‘ve been doing some research in alternative ways of getting myself around other than gas vehicles… well, I found something that uses a 78v 20ah battery, my question is, if i had a solar panel battery charging setup that had output amps of 5a, would it still be 4hrs or so? does the size in volts makes a difference in charge times?

By: ajmera

ajmera — Wed, 02 May 2012 22:24:47 -0700

ok thanks a lot i will let you know if it works!!!

By: ajmera

ajmera — Tue, 01 May 2012 21:08:23 -0700

hi there,
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

By: Duke

Duke — Wed, 11 Apr 2012 23:30:19 -0700

Your example calculation converting AC amps to DC Watts adding 10% for inverter inefficiency escaped me.
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)

By: Zakir

Zakir — Thu, 29 Mar 2012 04:56:15 -0700

1 Amp AC = 10 Amps DC …. you have written this for 110 Volts AC ….. what will be the conversion factor if we are on 220 Volts AC ???