Re: what capacity of solar panel to install

[ceetee]

deleted

[Sunking]

Based on 12 volt battery and using MPPT Charger Controller, then:

Panel Wattage = 500 watts
MPPT Charge Controller = 40 amps


If using battery at 24 volt, then same panel wattage but 20 amp MPPT controller.

Battery voltage is set by what the inverter requires. You stated "900 VA @ 14.5 amps" which means the inverter is 60 volt battery based on your statement. Need to get your story straight. 900 VA / 14.5 amps = 62 volts. A 12 volt 900 VA inverter uses 75 amps, and 24 volt uses 35 amps.

Sure hope you have a very small efficient refrigerator, because based on battery size you can only use 700 watt hour per day. You got a lot of homework to do.

[ceetee]

Based on 12 volt battery and using MPPT Charger Controller, then:

Panel Wattage = 500 watts
MPPT Charge Controller = 40 amps


If using battery at 24 volt, then same panel wattage but 20 amp MPPT controller.

Battery voltage is set by what the inverter requires. You stated "900 VA @ 14.5 amps" which means the inverter is 60 volt battery based on your statement. Need to get your story straight. 900 VA / 14.5 amps = 62 volts. A 12 volt 900 VA inverter uses 75 amps, and 24 volt uses 35 amps.

Sure hope you have a very small efficient refrigerator, because based on battery size you can only use 700 watt hour per day. You got a lot of homework to do.

Sunking, Thanks for ur detailed reply.

1. As per your suggestion, If i need to increase the battery to support refrigerator i can add extra batteries also.
But my doubt is, refrigerator can run on my 12V system (or) should i change to 24V system (actually i don't know difference between 12v & 24V. Pls help )
Also if my present inverter is 12v 900VA, can i use the same for charging 2batteries 24V system ? (or) should i do any modification of inverter ?

2. I just saw the inverter manual and it says 900VA / 16.5 amps (not 14.5amps)
Kindly read about this inverter on link http://www.luminousinvertersinchenna...ruralarea.html

3. i found a product called solar maximiser on link http://www.torpsystems.com/products.html
Is it worth to buy this product instead of MPPT charge controller ?
Is it genuine product (or) a disguise of MPPT charge controller with heavy price tag ?

[Sunking]

What voltage does the refrigerator operate at? Is it a DC model to run at 12 or 24 volts, or does it take AC power of either 120 or 240 volts?

[Sunking]

OK my bad, I just read your link on the inverter. It is technically a hybrid UPS that uses a 12 volt battery. The current reference is the inverters built in battery charger. Now I get it, so sorry.

OK you can only operate at 12 volts period, so that makes that decision real easy as there is only one option. So what do you want to do? Technically you do not need solar. You can add it, but not required.

For battery run as big of an 12 volt AGM battery as you can afford up to say 200 AH.

Want solar with that battery? Well for every AH of battery, use 1 watt of solar, and .1 amps of charge controller. So if you have a 200 AH battery then, 200 watt solar panel and 20 amp charge controller. Figure out what you can afford and getter done.

[ceetee]

The refrigeraor operates on 220volts.

we have huge power shortages from grid and hence,
Technically we need soar to charge the battery instead of using MAINS from grid power.

According to ur calculation, i have to use (pls correct if i am wrong)

500watts solar panel
MPPT Charge Controller = 20 amps
battery - my current 150AH
UPS - my current UPS/inverter 900VA

Did u also read about the product solar maximiser on the link ?
http://www.torpsystems.com/products.html
Is it worth to buy this product instead of MPPT charge controller? (it is very costly than charge controllers)
Is it genuine product (or) a disguise of MPPT charge controller with heavy price tag ?

[russ]

A no name piece of junk?

[Sunking]

According to ur calculation, i have to use (pls correct if i am wrong)

500watts solar panel
MPPT Charge Controller = 20 amps
battery - my current 150AH
UPS - my current UPS/inverter 900VA

Sorry but no where close using my calculations.

For example if you were to use a 500 watt panel on a 12 volt battery would require a 40 amp MPPT Charge controller.

[ceetee]

Sunking
Thanks. Now I understand that u don't know about the system in below link

anyhow thanks for your help in solar panel and charger.

Sorry but no where close using my calculations.

For example if you were to use a 500 watt panel on a 12 volt battery would require a 40 amp MPPT Charge controller.

[inetdog]

Sunking
Thanks. Now I understand that u don't know about the system in below link

I took a look at the manual for that system. I cannot tell much about the quality of the electronics, but the battery use strategy seems to be to primarily use the expensive power from the batteries instead of the lower cost power from the grid.
The installation instructions are somewhat dangerous and hard to follow.
(Example: Connect the EB (POCO) Phase line to the phase terminal. Connect the EB Phase line to the Neutral terminal. I know it is just a typo, but such an obvious one.)
The maximum panel Voc of 40 volts is too low to let you use cost-effective higher voltage panels or to put panels in series.
Despite the mention of the Vmp of the panels in the manual, I strongly suspect that it is a PWM rather than an MPPT controller. (The only way they can get >99% efficiency is if they are talking about current efficiency (I out = I in) which leaves a pretty bad loss of power.)

I would not consider investing in that particular piece of equipment.

[Sunking]

Sunking
Thanks. Now I understand that u don't know about the system in below link

Afraid I do my friend, and as a very experienced power engineer of 35 years, it is laughable.

[Hyacinth]

Good stuff.