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Playa Frambes Electrical

Solar Calculations:

We have put together an example of the solar system sizing and have completed a power consumption worksheet for Playa Frambes.

Following the completed worksheet we have a short analysis of Playa Frambes power usage, as well as a price estimate.


We recently added an electric refrigerator to our calculations.


Appliances
Watt Hours/ Day
Hours/ Day
Watts/ Day
Refrigerator (with ice maker)
92
x
24
=
2208
Bathroom Lights = 5 x 20w
100
x
3
=
300
Bedroom Lights = 4 x 20w
80
x
4
=
320
Computer System
200
x
4
=
800
Ceiling Fans = 10 x 70w
700
x
12
=
8400
Kitchen Lighting = 2 x 20w
40
x
6
=
240
Living Room Lights = 5 x 20w
100
x
6
=
600
Misc Kitchen Appliances
1200
x
0.25
=
300
Radio/Stereo
30
x
1
=
30
Refrigerator Ice Maker
50
x
1
=
50
TV = 2 x 150w
300
x
4
=
1200
Water Pressure Pump
100
x
1
=
100
Total watt hours per day
=
14,578
Multiply by 1.20 for Inverter Loss
=
17,494



Calculations For Number of Solar Panels Needed
Total Watts Used per Day
17,494
Number of Sunlight Hours for Charging
5
# of Watts a 165w Solar Panel Will Produce in 5 Hours
825
Divide 825w into 14,844w This = # of Panels Needed
21.20
Round Up to Even Number of Solar Panels
22
Cost Estimate for 165w Solar Panel
$595.00
Number of Solar Panels x $595.00
$13,090



Calculations For Battery Sizing
Watts / Volts = Total Amps Used per Day (14,578w / 12v)
1458
184 Amp Battery
184
Only Discharge Battery to Half Life
92
Total Amps / Battery Amps Available (1237a / 92a)
15.85
(Round up to Even Number) Number of Batteries Needed
16
Cost Estimate of 184 Amp Batteries
$179.00
Total Cost of Batteries
$2864.00



Pricing Calculations
22 Solar Panels 165w
$13,090.00
14 - 184 Amp Batteries
$2864.00
4048 Power Panel Inverter System
$4000.00
Cables and Mounts
$1000.00
California Tax 7.75%
$1624.00
Total Cost Estimate of Solar System
$21,578.00



System Analysis:

Playa Frambes will need approximately 22 - 165-watt modules and 16 - 184 amp batteries to run a daily load of 17,494 watt hours.

To figure this out you must understand that a free-standing solar system is not solar powered but battery powered.

Power is transfered from 12 volt batteries to an inverter that transforms it into house current (120v).

As the power is taken from the batteries there must be a system in place to recharge the depleted batteries.

This is where the solar panels come in. There has to be enough energy provided to produce enough power to replace the power in the batteries the inverter took for the house current.

How to calculate number of solar panels needed:

1. How many watts of power you will use each day? This is done by listing each appliance, the watts it uses per hour, and the number of hours it will be on. Ours is 17,494 for the 5 casitas.

2. When you find this number, you now know how many watts the solar panels have to supply the batteries during sunlight hours. Baja is rated as an average of 5 hours solar power available each day. This could be higher during certain times of year.

3. Now you decide what size solar panel you want to purchase. We will need several panels so we choose a larger size. (165 watts).

4. In 5 hours these 165 watt solar panels will produce 825 watts.

5. To get the total number of solar panels need for Playa Frambes you divide Total Watts (17,494w) by the total amount of watts the solar panels will produce during daylight hours (825w). Playa Frambes needs 22 (165w) solar panels.

How to calculate number of batteries needed:

1. Batteries are rated in Amp/Hours. We choose 12 volt 184 Amp/Hour deep cell batteries available for $179.00 each because they are available in Baja later if we have a battery failure.

2. Since we know how many watts Playa Frambes will use per day, (17,494w) it is a simple conversion to convert watts to amps. (watts divided by Volts = Amps). Total Amps need per day will be 1458.

3. Batteries should only be discharged to half-power. This meand our 184 amp batteries are actually only 92 amp usable.

4. Divide total necessary amps (1458) by useable battery amps (92) to get number of batteries needed for one days storage. This number is 15.85 but there is no .85 battery so you ned to round up. (16 batteries needed for Playa Frambes)

This makes for a fairly large system. Prices are taken from this well respected solar company in Victorville California.

Here is their link.

Solatron

We will install a back-up generator to repower the batteries on cloudy days.

Other Electrical Users:

The refrigerator will be an electric model with an electric icemaker in the door. We recently shopped different refrigerators and noticed the NEW ones use much less electricty than the OLD ones, even from 5 years ago. Technolgy is advancing very quickly.

The washer and dryer will be operated as needed with a propane powered generator. (1000 gallon propane tanks are available at Home Depot in TJ for $500.)

Individual casita air conditioners will be powered as necessary with individual gas generators. We will discuss air conditioners later.

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