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4/14/10

Off Grid Net Zero Systems For A Prefab Green Modern Home

We spoke about off grid net zero systems for our own prefab green modern home last weekend (see the videos here), but Handsome Husband also put together a worksheet of all the off grid net zero systems we consider installing in our own net zero, passive solar prefab green home.

NOTE that YOUR family's load needs, site / climate conditions, etc. will certainly differ from what we have individually tailored for ourselves; I assume if you are on grid this will be much less, but in the end your systems costs all depend upon what systems YOU choose with your contractor to suit your individual needs.

Also note we originally spec'd off grid systems over two years ago, and so, as new technology / other ways of achieving what we want became available, we changed some things to what we have today, that's attainable for us within our own budget.  So if you are reading this post two years in the future, don't take this as "today's latest and greatest" - do yourself a favor and see what's new in the off grid marketplace!
Here is our "ALMOST DECIDED UPON" off grid systems information:
HEAT:


Qty Item Price Extended
2 2 zone, 3 loop ea. Manifold
Mr. PEX 103B-50P - 3 Loop Radiant Heat Manifold Package (1/2" PEX)

pexsupply.com
 $     174.95  $   349.90
2 El Sid Radiant Heat Zone Circulation Pump
(one for each zone and one for solar collector circulation)

Model Number: EL-SID10B24

24Volt
0.25 Amp
3 Gal/Min flow at no head
max. unbalanced head: 3.5 feet


mavericksolar.com
 $     240.00  $   480.00
1 mixing valve
3/4" Sweat 5003 Mixing Valve
Taco 5003-C2

pexsupply.com
 $     100.00  $   100.00
2 High performance air eliminator
Watts 0590715 - 1/8" FV4 Auto Air Vent
pexsupply.com
 $         5.00  $     10.00
4 Fill and drain valves
3/4" 777SI Bronze Wye Strainer (Threaded)
Watts  0379082

pexsupply.com
 $       25.00  $   100.00
2 Isolation valve
3/4" Solder Ends Gate Valve
Matco-Norca  514C04

pexsupply.com
 $         7.00  $     14.00
8 Pressure/Temperature gauge
Boshart TR25-CB1-60/250 - 1/4" NPT, 2.5" Face, Temperature & Pressure Gauge (Tridicator)
1-9/16" long Well, 1/4" npt thread
(for DHW, solar, each radiant loop)
pexsupply.com
 $       15.00  $   120.00
2 Expansion tank
#60 Extrol Expansion Tank (7.6 Gallon Volume)
Amtrol  103-1

pexsupply.com
 $       66.00  $   132.00
2 Check Valve
3/4" Solder Ends Swing Check Valve
Matco-Norca  521C04

pexsupply.com
 $         7.00  $     14.00
2 Radiant Heat Thermostat
Honeywell
VisionPro Thermostat (1 Heat - 1 Cool)
Honeywell  TH8110U1003

pexsupply.com
 $     100.00  $   200.00
2 Radiant Heat pump relay
Honeywell
Universal Switching Relay w/ Internal Transformer

The R8845U Universal Switching Relay with 24 V transformer provides intermediate switching of line-and low-voltage devices from a line- or low-voltage controller and is typically applied in Hydronic heating systems.
 $       47.00  $     94.00
2 pressure relieve valve
Watts 140 Re-Seating Temp & Pressure Relief Valve
3/4" 140S Relief Valve
Watts  0254702

pexsupply.com
 $     105.00  $   210.00
1 Mixing valve (DHW)
3/4" Sweat 5003 Mixing Valve
Taco  5003-C2

pexsupply.com
 $     100.00  $   100.00
 $          -  
 $          -  
 $          -  
heat total  $1,923.90 

HOT WATER:

Qty Item Price Extended
1 hot water storage tank 80 gal
used for radiant heat supply, this is a standard electrical water heater retro-fitted with an external heat exchanger
GE 80 Gallon Electric Tall Water Heater 6YR 4500 Watt DE
# Amperage : 18.8 A.
# Assembled Depth (In Inches) : 23 In.
# Assembled Height (In Inches) : 59 In.
# Assembled Weight (In LBS) : 177
# Assembled Width (In Inches) : 23 In.
# Voltage : 240 V.
# Watts : 4500 W.
# Weight : 177 Lbs

http://www.homedepot.com/Appliances-Water-Heaters/GE/h_d1/N-1z13sktZbaoaZ1xkwZlo/R-100181858/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
 $      488.00  $      488.00
1 hot water storage tank 40 gal
used for domestic hot water supply, this is a standard electrical water heater with an external heat exchanger retro-fitted
GE 40 Gallon Electric Medium Water Heater 6YR 4500 Watt DE
# Voltage : 240 V.
# Watts : 4500 W.
Amperage : 18.8 A.

# Assembled Depth (In Inches) : 19.75 In.
# Assembled Height (In Inches) : 46.75 In.
# Assembled Weight (In LBS) : 105
# Assembled Width (In Inches) : 19.75 In.

http://www.homedepot.com/Appliances-Water-Heaters/GE/h_d1/N-1z13sktZbaoaZ1xkwZlo/R-100183332/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
 $      283.00  $      283.00
2 external heat exchanger
Solar Hero Heat Exchanger
comes ready to be plumbed to electric water heater

http://www.solarhero.com/HXdetail.htm
 $      300.00  $      600.00
0 Tankless water heater
Bosch AquaStar 1000P tankless propane
used as a backup heat source tied into the solar loop feeding DHW and radiant storage tanks
activates above 0.5 gallons per minute (gpm)

cancelled as it is requested to be installed outside
 $      350.00  $             -  
1 Differential Temperature Controller
SunEarth SETR0301U Solar Water Heating Differential System Control

(includes 2 sensors)

The control output is wired to a pump that circulates the heat transfer fluid between the solar thermal collectors and the storage tank during the course of the day. This microprocessor-based control utilizes two RTD type sensors to monitor collector and tank temperatures with digital accuracy.

mavericksolar.com
 $      160.00  $      160.00
1 Differential Temperature Controller (basic)

gives preference to heating the radiant tank over the DHW tank by switching the DHW circulator on when the temperature in the radiant tank is greater by X degrees than the temperature in the DHW tank.

ART-TEC Solar Powered Differential Temperature Controller DTC-1

includes 2 temperature sensors
handles up to 30 V and 72 Watts/6 Amps (use relay if larger power needs but unnecessary since it is driving the El-SID pump:
24Volt, 0.25 Amp

mavericksolar.com
 $      100.00  $      100.00
1 mixing valve
3/4" Sweat 5003 Mixing Valve
Taco 5003-C2

pexsupply.com
 $      100.00  $      100.00
1 El Sid Radiant Heat Zone Circulation Pump
(for solar collector circulation)

Model Number: EL-SID10B24

24Volt
0.25 Amp
3 Gal/Min flow at no head
max. unbalanced head: 3.5 feet

mavericksolar.com
 $      240.00  $      240.00
hot water total  $   1,971.00

AIR QUALITY:

Qty Item Price Extended
0 Airiva Heat Recovery Ventilator
part #: AR3468
80% temperature recovery
up to 4000 sf

http://comfortfirst.com/p-28906-airiva-heat-recovery-ventilator-improves-house-air-exchange-free-shipping.aspx

cancelled: noisy, requires external timer
 $     450  $        -  
1 VHR 1404 Air Exchange Heat Recovery
Ventilator (Fantech.net)
120V
1.4A
190 VA (Watt)
(what is difference of SHR 1504 1.5A?)
 $     700  $     700
0 A-Ceiling Fan 24v
http://www.backwoodssolar.com/catalog/fans.htm
cancelled for now, prepare wiring
 $     135  $        -  
0 A-Swivel Kit  $       20  $        -  
air quality total  $     700
Tips: Put a fresh air inlet close/in the kitchen to make cooking smell extraction more efficient.
To reduce noise don't put a T duct junction closer than 1.5m from HRV unit, and use a soft Y junction.

Use acoustic ducting between rooms if there is 'cross talk' via the ducting, or for short outlet ducting. It is expensive if you get the proper stuff - it HAS to be acoustic ducting, don't accept insulated ducting with acoustic properties).

If you connect the cooker extract, disable the cooker hood fan which locally accelerates grease around the ducts and use the fan signal to demand maximum HRV boost. Use an additional in line filter if there is any doubt about grease. Note as the system is balanced you will not need to run it at such a violent rate as before to get the same effect. I find the default trickle vent enough for cooking with lids on pots in summer.

Build time about 3-4 days for this job.
I choose the Vent Axia HR250, because it is older technology, cheap, robust, easy to speed control, has multiple extract vents, and the company has a good and long reputation. I'm not sure the newer versions with pollen control and summer by pass filters, electronic control systems really justify an extra £1K.
MISC:


Qty Item Price Extended
0 remote light switch kit - simple

http://www.adhocelectronics.com/Products/Wireless-Lighting-Control

http://www.adhocelectronics.com/Products/Electricians-Builders-Contractors

cancelled, review conventional wiring
 $   149.00  $          -  
10 Lighting:

L-CF 11:
12V, 11 watt, approximately 600 lumens

backwoodssolar.com
 $     18.00  $   180.00
1 Little Giant Sewage Pump (Black Water)
ES40M1-10
SKU: 509560

120 V
8.9 Amps (running)
15' head 22 gal/min

pexsupply.com
 $   250.00  $   250.00
1 Little Giant Sewage Pump (Gray Water)
ES40M1-10
SKU: 509560

120 V
8.9 Amps (running)
15' head 22 gal/min

pexsupply.com
 $   250.00  $   250.00
miscellaneous total  $   680.00

ELECTRICAL SIZING:
Device Volts Amps Watts hours/day Watt Hours Amp Hours
Solar Circulation pump
through solar hot water collector
El-SID
24 0.25 6 8 48 2
DHW Tank Circulation Pump
through heat exchanger
El-SID
24 0.25 6 8 48 2
Radiant Tank Circulation Pump
through heat exchanger
El-SID
24 0.25 6 8 48 2
Radiant Heat Circulation Pump
for Zone 1
El-SID
24 0.25 6 14 84 3.5
Radiant Heat Circulation Pump
for Zone 1
El-SID
24 0.25 6 14 84 3.5
Water Supply Pump
SHURFLO 2088
24 7 168 1 168 7
Sewage Pump (Black water)
Little Giant
120 8.9 1068 0.25 267 2.225
Sewage Pump (Grey water)
Little Giant
120 8.9 1068 1 1068 8.9
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Lightbulb 12 0.9 10.8 6 64.8 5.4
Laptop IDEAPAD Lenovo 120 0.06 7.2 10 72 0.6
Laptop IDEAPAD Lenovo 120 0.06 7.2 5 36 0.3
Heat Recovery Ventilator 120 1.4 168 2 336 2.8
refrigerator Sundanzer R165 24 8 240 0
0
total power consumption 3147 88.825














battery storage efficiency 0.8




daily hours of sunshine 6




panel output Amps 19 amp hours needed/battery stroage efficiency/hours of sunshine
Mitsubishi MF125 Amps 7.23




# of panels needed 3




...And there you have it - more off grid net zero systems information than you ever want to know for our OWN prefab modern house kit!

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2 Comments:

At 4/14/10, 11:21 AM , Blogger martin. said...

Hi - Thanks for this post...it is very helpful information.

I have a really unrelated question: How are the SIPs manufactured with regard to glue materials? Are there any formaldehyde-emitting materials or any other 'toxic' materials used or is it 'all green'?

Thanks so much in advance...Martin.

 
At 4/14/10, 12:56 PM , Blogger Copeland said...

Here's some information on the SIP:

"The wood facings are from rapidly renewable wood species
• Foam-Control EPS does not contain CFCs, HFCs, HCFC’s
• SIP construction minimizes the use of traditional
lumber
• The Foam-Control EPS is fully recyclable
• Waste is minimized by providing factory fabrication of
complete building packages"

 

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