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Join Date: Sep 2010
Posts: 45

Cost Analysis Among Three Power Backups

12/22/2010 9:39 AM

Hi engineers!

One customer has called me to give him a cost estimate(analysed and shown clearly) that will be involved in buying and installing power backup system amoung inverter/battery system,solar system and portable generator for his home during when the utility power goes off.The total load is about 500W and should run for 5hrs.

From my experience, I know that the portable generator will be relatively cheap(around USD 800) but involves running cost and disturbance,inverter/battery system will be a little high(USD 1,100) and solar system backup will be the highest(around USD 4000: 1Watt = USD 8-10,i.e material + installation).

Please help and if possible connect to me a link.

Best regards.

Estimate currency conversion

1USD = 1500TSH

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Anonymous Poster
#1

Re: Cost Analysis Among Three Power Backups

12/22/2010 9:45 AM

This is the best solution. very cheap.

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Guru
United States - Member - New Member Engineering Fields - Power Engineering - New Member

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#2

Re: Cost Analysis Among Three Power Backups

12/22/2010 10:48 AM

Hmmm...

"Cost estimate" is a little too vague for my taste.

Installed cost? Operating cost? Long term cost of ownership?

Inverter / battery cost considerations:

  • Components (inverter, batteries, battery charger, cables, adequate framework to hold batteries (higher if in a seismic area), ventilation, effects of ventilation on HVAC system costs (if any)
  • Labor for installation
  • Cost of utility power to charge batteries and float them
  • Battery maintenance / replacement over time, including disposal

Solar PV system cost considerations:

  • Components (solar panels, inverter, cables, adequate framework to hold panels (higher if in a seismic or high wind area)
  • Labor for installation
  • PV panel maintenance (cleaning), including replacement of dead / damaged panels, disposal.
  • ALL of the above costs for a inverter / battery system above

Generator system cost considerations:

  • Components (generator, transfer switch, cables, fuel storage facility, leak detection, level monitoring system, fire suppression system).
  • Labor for installation
  • Fuel, delivery / transport, spill containment / mitigation, future clean up.
  • Generator maintenance (oil changes, cleaning, replacement parts, labor).
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Guru
United States - Member - Member Engineering Fields - Electrical Engineering - Electrical Construction

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#3

Re: Cost Analysis Among Three Power Backups

12/22/2010 10:51 AM

You state the load will be 500W but do not state the voltage. Based on your currency conversion info, I will assume TSH = Tanzania - 230V @ 50Hz.

The following is based on a self starting, maintained system;

A generator will require a transfer switch, electric start on the gen-set, fuel supply and interconnecting conduit systems. Estimated Installed Cost: $7500.00

A solar system will require a solar array (collector), inverter, batteries, and related conduit systems. Estimated Installed Cost: $5500.00

A UPS System will require a place to mount it.

500 watts @ 230 volt for 5Hr will not require a huge capacity.

My choice would be a 750 to 1000 Watt UPS System.

The UPS vendor will be able to help you out with the required battery configuration to maintain back-up for 5 hours.

My estimate of a 750W - 230V - 50Hz UPS System with 5 hour reserve would be $700.00 to $1000.00 (USD).

Disclaimer: My dollar estimates are just that - estimates based on my local codes and vendor pricing.

A search on Google of "ups 750 watt 230 volt 50 Hz" is a good place to start looking.

Here is a link: http://www.google.com/search?q=ups+750+watt+230+volt+50+Hz&sourceid=ie7&rls=com.microsoft:en-us:IE-SearchBox&ie=&oe=

Hope this helps - Good Luck!

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Associate

Join Date: Sep 2010
Posts: 45
#4
In reply to #3

Re: Cost Analysis Among Three Power Backups

12/23/2010 8:49 AM

KJK!

Thank you for your comment,I real appriciate your response.

Best regards

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#5

Re: Cost Analysis Among Three Power Backups

12/23/2010 11:46 PM

Here are some generators, including some quiet RV (recreational vehicle) types of 1500 watts for about US$300.

http://duropower.com/?gclid=CJH1j5WIhKYCFRiAgwodlRFRqQ

For the small size of the load, a "transfer switch" could consist of a simple plug that would attach either to the generator or the grid, with no chance of cross-connection. You would want a pilot light still on the grid so you could tell when power is restored.

Ths is all manual, of course, but it looks pretty cost-effective.

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