1.22kW Off-Grid Tiny House Solar Power System (Base Kit 2)
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1.22kW Off-Grid Tiny House Solar Power System (Base Kit 2)
This off-grid solar power system kit provides nearly everything you need to bring 1.22kW of off-grid solar power and storage to a tiny house off the grid. Choose your preferred battery type and solar panel mounting option, and you're on your way!
This 1.22kW Tiny House Solar Power System Includes:
- 4x REC TwinPeak 2 305W monocrystalline solar PV modules
- 1x Samlex EVO-2224 Pure Sine Wave Inverter/Charger (2200 Watts, 24V) with remote control
- 1x Samlex E-Panel for EVO-2224 Inverter/Charger
- 1x Outback Power FLEXmax 60 MPPT Charge Controller
- 2x 30' MC4 connector cables
- 1x MC4 connector cable disconnect key
- 1x Midnite Solar MNPV3 Combiner Box
- 2x ½" strain relief - 2 round holes/locknuts
- 1x ½" strain relief - 1 round hole/locknut
- 2x 20-amp din rail mount breakers
- 1x 40-amp din rail mount breaker
- 1x 63-amp din rail mount breaker
- 1x 63-amp DC ground fault protector
- 1x surge protection device - 115VDC
- 1x surge protection device - 300VAC
The inverter/charger at the heart of this system is a Samlex EVO-2224, capable of delivering 2.2kW continuously over 120-volt pure sine wave AC output. As a 24V battery bank charger, the EVO-2224 offers adaptive 3- or 4-stage charging with equalization. And with two programmable AC inputs, a generator can easily be added to this system. Working in tandem with the EVO-2224 is FLEXmax 60 MPPT Charge Controller from OutBack Power, which provides up to 60 amps of 5-stage battery charging from your solar panels.Is This the Right Off-Grid Solar Power System for Me?
The answer starts with knowing how much power you need on a daily basis in kilowatt-hours (our load calculator can help with this; divide the number it gives you in Watt-hours by 1000 to get kilowatt-hours, or kWh).
Compare your daily kWh needs to the map here, which shows the amount of daily kWh this system's solar panels will produce if installed at an optimal tilt during the time of year when there's the least amount of sun. If your needs exceed the solar potential shown for your area on the map, check out our larger off-grid solar power system kits.
If this 1.22 kW Tiny House Solar Power System is appropriately sized for your needs, then it's time to consider which battery storage and solar panel mounting options you want to use with it. The tables below compare each of these options.
Battery Bank Options for 1.22kW Tiny House Solar Power System:
Battery Type Trojan L-16-RE-B Premium Flooded Lead Acid Battery 
KiloVault 2100 PLC
Advanced AGM Battery
KiloVault Lithium Battery 
# of Batteries in Kit
(Necessary cables also included)(4) Trojan L-16-RE-B
Flooded Lead Acid Batteries
5' pair 2/0 battery-to-inverter cables
8" 2/0 battery interconnect cable - black(4) KiloVault PLC 2100
Advanced AGM Batteries
5' pair 2/0 battery-to-inverter cables
8" 2/0 battery interconnect cable - black
8" 2/0 battery interconnect cable - red(2) KiloVault 1800 HLX
12V Lithium Batteries
5' pair 2/0 battery-to-inverter cables
13" 2/0 battery interconnect cable - black
13" 2/0 battery interconnect cable - redMaintenance (Watering) Yes No No Maximum Recommended Depth of Discharge (DoD) 50% 50% 80% # Cycles at Max Recommended DoD 1600 3000 5000 Battery Voltage 6V 12V 12V Battery Amp-Hours (C/20 Charge Rate) 370 Ah 180 Ah 150 Ah Battery Watt-Hours (C/20 Charge Rate) 2220 Wh 2160 Wh 1800 Wh Total Battery Bank Capacity (C/20) 8.88 kWh 8.64 kWh 3.6 kWh Maximum Useable Capacity
at Max DoD4.44 kWh 4.32 kWh 2.9 kWh Average Price Per Battery $359 $475 $1375 Average Cost/kWh Cycle* $.20 $.15 $.19 Average Lifespan 7 years 8 Years 13 Years Operating Temperature Range -20° to 45°C -20° to 45°C 0° to 45°C Weight per Battery 118 lbs 127 lbs 42 lbs Warranty 2 Years 5 Years 7.5 Years Country of Origin USA China China Pros Smart Carbon technology for 15% improved cycle life.
Least expensive option up front.Advanced Pure Lead Carbon technology improves charge/discharge.
Avg cost up front.
Maintenance Free.Maintenance-free.
Modular and lightweight.
Safe, non-toxic,
environmentally benign.
No cooling or ventilation needed.
Lowest lifetime cost.Cons Maintenance required (watering).
Replacement costs (~4X over life of solar system).
Requires ventilation due to off-gassing.
Limited to 4 strings in parallel.Replacement costs (~3X over life of solar system). Highest up front cost. *Average Cost/kWh Cycle = (Avg Price Battery/(# Cycles x DoD X Wh)) x 1000
Solar Panel Mounting Options for This 1.22kW Off-Grid Solar Power System:
Mounting Type Metal Roof Mount Option 
Shingle Roof Mount Option 
Top of Pole Mount Option 
Kit Includes IronRidge XR1000 7' Rails, clamps, S-5 Versa Bracket clamps IronRidge XR1000 7' Rails, clamps, and flashing MT Solar 4 Module Mount,
IronRidge XR100 7' Rails, mid clamps (need to add end clamps to order)Weight Tolerance Up to 90 PSF Up to 90 PSF Up to 30 PSF Documents
Solar Panel Specs
- 65.9" H x 39.25" W x 1.5" D
- 40.8 lbs
- 60 monocrystalline cells
- Peak efficiency: 18.3%
- Nominal power: 305W
- Tolerance: +0-5W
- Nominal voltage: 33.3V
- Open circuit voltage: 38.8V
- Short circuit current: 10.04A
- Maximum system voltage: 1000V
- Connectors: MC4 compatible
- Manufacturer: REC Solar
- Model number: REC305TP2M
The exact solar panels used in your kit may depend on what's available to us and what's best suited to your needs.
Inverter Specs
- 12.79" W x 16.77" D x 8.15" H
- 57 lbs
- Input (battery) voltage: 18.1 - 34VDC
- Continuous power: 2200VA
- Power Boost rating (5 sec): 3300W
- Output voltage: 120VAC
- Output frequency: 60 Hz
- Peak efficiency: 93%
- Max battery charging output: 70A
- Manufacturer: Samlex
- Model number: EVO-2224
Charge Controller Specs
- 13.75" H x 5.75" W x 4.5" D
- 11.65 lbs
- Typical efficiency: 98.1%
- Peak input voltage: 150V
- Maximum battery charging current: 60A
- Battery voltage range: 12 - 60V
- Maximum open circuit voltage: 150V
- Manufacturer: OutBack Power
- Model number: FM60-150VDC
