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Solar set up for fridge/freezer


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I’m glad you started new section been meaning to get this post up for awhile.

been Messing around with some old panels someone gave me for a year ,but with them being only 40 w and most of our lead acid batteries drained it’s not much use.

old system
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so now want to upgrade and try to have set up to run a fridge freezer For around 8-10 hours a day,also WiFi router and 800w blender.

thinking panels ,charge controller/inverter and lifepo4 battery set up.

looking for advice on whole system set up .....amount off panels ,reliable charger/inverter Etc etc 

this is the fridge freezer that we want to run in daytime 8am to 6pm we are completely off grid.

thinking possible to do for around 25,000bht?66EDE994-B212-424D-97C9-7687B53D0A88.thumb.jpeg.1104282e6e445ec775406be48319a613.jpegimage.thumb.jpg.e542291ed803f343135b15d3fd7ebd8c.jpg

 

 

Edited by taninthai
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Having a chest freezer operate for 8 - 10 hours a day, is no good, whatever you have in it is not going to keep. regards Worgeordie

The starting point is to calculate the total power requirements of all the devices and utilities that will be connected to the system. For example if the fridge is rated at 130 watts. Thus if ope

Perfectly possible . Recommend same like above , 7000 baht , is plenty good ( i need to check if pwm can be in good use with lifepo4 , but BMS will be there ) , thats 24V so you need 24V bat

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Why not just clean the panels (could easily increase the output by 50 %), and replace the old battery with a new one? The inverter seems to work ok.

One thing you should keep in mind, no matter if you keep the old inverter or buy a new one. If you operate the inverter near the sea and there is a fan inside the inverter, the fan will accumulate sea salt dust in the electronics over time. In the rainy season with its high humidity this salt layer causes the tiny metal components of the electronics to corrode.

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The starting point is to calculate the total power requirements of all the devices and utilities that will be connected to the system.

For example if the fridge is rated at 130 watts. Thus if operated for 10 hours the calculated power will be 10 hours multipled by 130w giving 1.3 kWh. 

 

The next step is to decide how much reserve power is needed for when the solar panels are not producing electricity. Overcast and cloudy days.

From this point you can then determine the battery voltage and capacity and the solar panel requirements taking into account the peak sun hours for your location.

 

 

 

Edited by cleopatra2
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4 hours ago, Nakdontree said:

Why not just clean the panels (could easily increase the output by 50 %), and replace the old battery with a new one? The inverter seems to work ok.

One thing you should keep in mind, no matter if you keep the old inverter or buy a new one. If you operate the inverter near the sea and there is a fan inside the inverter, the fan will accumulate sea salt dust in the electronics over time. In the rainy season with its high humidity this salt layer causes the tiny metal components of the electronics to corrode.

The inverter side of the Leonics device doesn’t work we using that as a charge controller and the small silver inverter is only good for WiFi router...The panels are about 12 years old 40w power output,way way out dated now you would need 9 of them just to get the power of one modern day panel.

2 hours ago, worgeordie said:

Having a chest freezer operate for 8 - 10 hours a day, is no good,

whatever you have in it is not going to keep.

regards Worgeordie

It’s only going to be to keep drinks in .when we return to busy times we sleep there at night and start generator for electric.

Edited by taninthai
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I would calculate the peak power need  (freezer + frigerator + blender + wifi + etc) maybe around 1200 watt, then you have an idea what size of panel you need, if a panel gives 300 watt you will need 4 panels to go off grid, but you can not calculate with the 300 watt at a panel, because that is only when the sun is in the optimal angel at the panel, I would calculate with around 200 watt (on a 300 watt panel) a panel in the day/suntime, so in this simple calculation you will need 6 300 watt panels. If you will charge a battery then you will need more panels. This is the most simple calculation.

 

The freezer blender etc is not running the hole time, if you have battery installation, you can use the battery to the peak situations, take out the blender of the calculation, then you will need around 300 watt + battery charge power, depends on the battery size but lets say around total around 6-800 watt solar panels needed then you will need 4 300 watt panels, still simple calculation.

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19 minutes ago, finnsk said:

I would calculate the peak power need  (freezer + frigerator + blender + wifi + etc) maybe around 1200 watt, then you have an idea what size of panel you need, if a panel gives 300 watt you will need 4 panels to go off grid, but you can not calculate with the 300 watt at a panel, because that is only when the sun is in the optimal angel at the panel, I would calculate with around 200 watt (on a 300 watt panel) a panel in the day/suntime, so in this simple calculation you will need 6 300 watt panels. If you will charge a battery then you will need more panels. This is the most simple calculation.

 

The freezer blender etc is not running the hole time, if you have battery installation, you can use the battery to the peak situations, take out the blender of the calculation, then you will need around 300 watt + battery charge power, depends on the battery size but lets say around total around 6-800 watt solar panels needed then you will need 4 300 watt panels, still simple calculation.

Using the solar panels to drive the equipment is not the way to go.

Simply put the equipment should be driven by batteries . The solar panels charging the batteries.

 

Calculate your power requirements.

Then determine battery capacity.

Finally required solar panels to recharge the batteries.

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The aprox costs for a off grid battery "1200 watt solarpanel" installation is: panels 4*4000 - 16000 baht, battery for solar panel use min. 6-8000 baht, inverter/controller 6-8000 baht, cables etc 4-5000 baht, installation ? total around 35000 -40000 for a DIY installation

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20 minutes ago, cleopatra2 said:

Using the solar panels to drive the equipment is not the way to go.

Simply put the equipment should be driven by batteries . The solar panels charging the batteries.

 

Calculate your power requirements.

Then determine battery capacity.

Finally required solar panels to recharge the batteries.

I agree, this is the best way. But it looks to me he was interested in a cheap installation. 

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1 hour ago, taninthai said:

The inverter side of the Leonics device doesn’t work we using that as a charge controller and the small silver inverter is only good for WiFi router...The panels are about 12 years old 40w power output,way way out dated now you would need 9 of them just to get the power of one modern day panel.

It’s only going to be to keep drinks in .when we return to busy times we sleep there at night and start generator for electric.

Is the plan to have the solar system permanently on site

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19 minutes ago, finnsk said:

The aprox costs for a off grid battery "1200 watt solarpanel" installation is: panels 4*4000 - 16000 baht, battery for solar panel use min. 6-8000 baht, inverter/controller 6-8000 baht, cables etc 4-5000 baht, installation ? total around 35000 -40000 for a DIY installation

The number of panels depend upon the sun peak hours and charging rate required.

For example a single 200w panel would be sufficient if the peak sun hours is 2 hours and a charging rate of more than 3 days required.

 

NB I have not taken into account losses that would be incurred. However simply using 2 200w panels gives a 50% increase.

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Finsk think your estimate costs are way high and bit confusing really,,

this system gonna stay on site panels mounted on roof that gets good sunlight if clear sky from 9am-3pm.

without any calculations i have been guessing probably 3 panels,,,,been looking at controllers/inverters like these

https://s.lazada.co.th/s.XLhO9 or the similiar yellow suoer one.

batteries approx 8000 bht for 100 ah inc bms.

https://s.lazada.co.th/s.XL1T2
 

Edited by taninthai
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Perfectly possible .

Recommend same like above , 7000 baht , is plenty good ( i need to check if pwm can be in good use with lifepo4 , but BMS will be there ) ,

thats 24V so you need 24V battery

Thats 8 times Lifepo4 , at around 1000 baht each for 100ah https://www.lazada.co.th/products/new-great-power-lithium-ion-lifepo4-32v-12v-grade-a-100ah-ups-battery-i1686100635-s4744416814.html?

just a example.. plenty around .

( mind you, you'll be having tons of extra power for nighttime use since the batteries contain 2.4kW at 80% max ->2kw for 2000 cycles ( can be lot more if taken care , and not depleted 80% ))

 

BMS https://www.lazada.co.th/products/daly-bms-bms-lifepo4-32v-8s-24v-50a-60a-80a-100a-battery-management-system-i1708960176-s4848506043.html?

Solar panels : 2 panels might do the job if they are 400w or higher , there are cheaper options on lazada (300 w for 1900 baht ) .

If you do not go overboard on wires, fuses , mounting ...

i'd say another 2000 baht .

There are other options , making it cheaper , depending what you want . 

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Thinking about it , you want it to run daytime only .

The fridge is nothing , any pure sine inverter will do the job . The blender is a different story , so you need a bigger inverter , so the 1 from above still stands .

The batteries however do not need to be so big , since you do not need so much power . Better choose 50Ah or even 25Ah batteries like this

https://www.lazada.co.th/products/lifepo4-12v-25ah-i1402982868-s3589714007.html?spm=a2o4m.searchlist.list.18.62c128c9pOiAiH&search=1

 

need 2 sets (8p)to get 24v so 3300 baht or around 6000 for 50Ah version  , but a cheaper bms will do also like 500baht ( BMS 8s 50a will certainly do )

Solar panels would still keep the 2 panels at around 3000-4000 a piece .

So basically , it all comes down to the batteries , want to run 24h or only daytime . When only daytime , i would think about 2 car batteries , because you only need them for buffering a power surge . Want to run everything for 24h use , go for 50 or even 100Ah , to get everything you want .

 

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12 hours ago, cleopatra2 said:

Calculate your power requirements.

Then determine battery capacity.

Finally required solar panels to recharge the batteries.

 

This is the way to do it.

 

Some good advice and links above, a few more thoughts;-

  • Go for an MPPT charge controller, more expensive but significantly more efficient than PWM.
  • I would buy ready built battery packs with BMS installed rather than individual cells.
  • Definitely a pure-sine inverter for your freezer motor's health.

 

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