What Might An Off-grid System Cost

This is a list of materials and a cost without installation for a 4 kWh panel system. This is provided for a guideline only, and each customer's needs are different and each house is a custom design.

This example package is for the following application:

QTY Manufacturer  Item Cost
6
MULTI-CONTACT MALE/FEMALE PV WIRE, 6 M, (PAIR) 10 ga
2
MULTI-CONTACT MALE/FEMALE PV WIRE, 10 M, (PAIR) 10 ga
12
Iron Ridge 51-7000-108A, XRS rail 108", anodized clear
1
Iron Ridge 29-4000-099, XRS endcap (20 pieces)
8
Iron Ridge XRS splice kit 29-7000-010
2
Iron Ridge END CLAMP FOR 42 - 44 MM MODULES (4) 29-7000-171
7
Iron Ridge MID CLAMP FOR 40 - 44 MM MODULES (4) 29-7000-101
7
Iron Ridge L-FEET, INCL. HARDWARE (4), mill finish 29-7000-017
1
Iron Ridge Wire management clips (bag of 30) 29-4000-006 for Iron Ridge
1
Iron Ridge WEEB DMC-CLIP (20 PCS ) 29-4000-001
1
Iron Ridge WEEB grounding Lug (5) 29-4000-002 use 1 per rail segment
2
Iron Ridge Wiley bonding jumper (5) 29-4000-3 use 1 per splice
16
Canadian Solar Canadian Solar 250W 60C Poly PV module, CS6P-250P Made in China
50
4" stainless steel lag bolt, 5/15 diam
50
3.5" stainless steel lag bolt, 5/16 diam
1
MIDNITE SOLAR MNPV12 COMBINER BOX, fits  12 x 150 VD mini-DIN breakers, or 10 x 600 VDC 3R rainproof enclosure
8
Midnight Solar 10A 150 VDC breakers, DIN Rail MNEPV10
8
Sealcon Inc 1/2 NPT 2 hole liquid tight strain relief, for PV wires into combiner
1
Sealcon Inc 1/2 NPT solid plug liquid tight strain relief, for ground wire into combiner. Drill own hole
1
Delta Lightning arrestor for DC combiner LA302DC
1
Outback Flexmate 80 MPPT CHARGE CONTROLLER – 80 AMP 12, 24, 48, 60 VDC BATTERY - 150 VOC MAX PV ARRAY (COLD
1
Outback E-Panel Add-on Flexmate 80 MPPT CHARGE CONTROLLER – 80 AMP 12, 24, 48, 60 VDC BATTERY - 150 VOC MAX PV ARRAY (COLD
1
Outback 7.2 kW FLEXPowerTWO, 2 x VFX3648  (FP2-10) 48VDC 120/240VAC
1
Outback HUB-4, COMMUNICATION MANAGER, ADD-ON
5
Outback CAT 5.E CABLE  3 FOOT / 1 METER 300 VOLT RATED
1
Outback CAT 5.E CABLE  6 FOOT / 2 METER 300 VOLT RATED
1
Outback Mate SYSTEM CONTROLLER  with RS-232 PC interface—WHITE—OVAL CASE
1
Outback FLEXPowerTWO DC circuit breaker for Fan, 1A OBB-1-150VDC120VAC-PNL
1
Magnum 35mm DIN Rail mounting rail, for relays, 1m
2
Omron Relay 12VDC 126ma coil for Ventilator, 220VDC MKS1XT-10DC12
1
Omron Relay socket for MKS-X, front facing, screw terminal, DIN rail or surface
1
Zephyr BATTERY BOX VENTILATOR, SPECIFY 48 V 85.8209  6W  2" PVC socket inlet, 3" outlet.
8
Surrette Battery S-460 six volt, capacity of 460 amp Hrs. @100 Hr
1
Surrette HYDROMETER
1
Quickcable Acid spill absorber & neutralizer 1 gal 510130-001
2
Quickcable Battery tray 120220-001 33" x 15"
6
Quickcable Battery interconnect cable 2/0  16", 5/16 stud. 7920-001H
1
Quickcable Battery interconnect cables 25", 5/16 stud.7925-001H
1
Quickcable #2 crimp lugs #2 wire, 5/16 stud 6401-005E bag of 5
1
Quickcable 25' #2, Black. Battery to inverter cable  unterminated,  200104-025
1
Generac EcoGen Series 5818 6 kW Generator with 120VAC output Propane. 3 yr/1500hr
1
Generac EcoGen Series 240VAC conversion kit 006016-1
1
Thermo Cube Thermo Cube TC-1 115VAC themostat, 0F turn on, 10F turn off.
1
Temro Battery warmer  Temro, 50W 120VAC 28" long.
1
Generic Starter battery for generator (group 26R Wet Cell Battery) for Generac
1
Delta Lightning arrestor for AC generator LA302R
15
TECK90 6-3 cable from generator to FP-2 AC enclosure (meters)
15
NMD90 14-2 110VAC circuit to power generator cold start kit, batter charger, battery warmer
15
18 AWG 2 wire cable, colour coded, for remote start
1
Installation labour
1
Shipping, with liftgate delivery (estimate only) $394.96
1
HST $2,955.71
1
Total  $25,691.93

For your convenience, the previous table is available in an Excel spreadsheet version for downloading.

Determining the peak and average daily electrical load

Click here to download a PDF file with a sample load analysis.

The Excel spread sheet used in this example is available upon request. There are a number of useful observations that can be made about this particular home.

First some background. The house is near Kingston, and is a newly constructed house. It has one adult and one child as the only fully time occupants. This is a year round home. It uses propane is the primary heating fuel, and uses radiant hot water heating and hot water from an instantaneous condensing propane hot water heater.

If you examine the per day column to look for the highest amounts, these are the items that drive the cost of the system. Here are my comments on each of these items.

The column to the left of the tick marks is another calculation to determine if the inverters have enough capacity to handle all the big loads that might possibly come on at the same time. Some appliances such as motors take a lot more power for a fraction of a second as they start. For this calulation this is the most important number, not the stady state load. The well pump is an example of such a load. A portable skill saw is another. The tick mark is for items that switch off and on by themselves, or may be normally turned on. The unchecked items are ones that use a lot of power, but you turn them on manually, and you can choose to only use one of these at a time. In this example it is reasonable to have 2419 watts plus one of the occasional loads, such as the worst case 1500W for the hair dryer. Thus if the inverter can handle 3919 watts or more, then the inverter should never be overloaded, and shut itself down to protect itself.