3 Panel Cottage Kit (900 Watt PV) – 2000 Watt Inverter
3-Panel Cottage Kit (900W)
900 Watt in solar PV, 2kW pure sine-wave inverter.
Produces 2.4 kWh/day in summer, 1.2 kWh/day in winter
4x Trojan L16RE-B-6V 6V battery, RE series, 370Ah/20h capacity, smart carbon, L terminals, 2 + 3 years warranty
3x Battery interconnect 1/0, 10″
1x Littelfuse JLLN-200, 200A/300V class T fuse
3x Heliene 60MHD-300, 300 Watt, 60-cell mono-crystalline PV module, black-on-black, MC4
1x set of MC4 Extension wires for PV module, 15′ PV-Wire
1x EP Solar Tracer-3215BN, 30A MPPT charge controller, 12V/24V, 150V DC
1x EP Solar MT50 remote control, LCD display, flush/surface mount
1x Cotek SP2000-124 pure sine wave inverter 2000W 24V, cUL
1x Inverter cables 1/0 AWG, 10 ft. pair
1x HydroVolt battery hydrometer, Compaselect – the last hydrometer you will ever buy!
1x MidNite Solar MNBCM, battery capacity meter for 12, 24, 36, and 48 volt
All the parts needed to make a simple, yet robust off-grid power system. We supply high-quality parts that should last a long, long time. These may be small systems, but they are real off-grid systems meant for real use (in short, these are not toys).
Our kits include pure-sine inverters. These produce a clean sine wave that runs all AC equipment (unlike the much-cheaper modified sine wave inverters). The inverters can provide twice as much power for short durations, so starting motors (i.e. well pump) and compressors (i.e. fridge) is no problem.
We sell the cottage kits with 1 through 4 panels. The solar panels are the same as used for large grid-tie systems on rooftops; they are very durable (25-year warranty!) and they offer great value for money. The included MPPT controller makes the most of every light situation; even when it is overcast there is usually still lots of Amps coming into the batteries!
Please see the PDF for the wiring diagram for these kits. The diagram is for a 2-panel kit, though the exact same principle applies for the other kits as well (there are just different numbers of panels in series). The large fuse is directly bolted to the positive side of the battery bank, and it is there as a measure-of-last-resort, to prevent the wiring from melting in case of a short circuit. All the other wires (charge controller, inverter, etc.) connect to the other side of that fuse, so those wires are protected to some extend in case of a short.
What size system you need will depend on your expected daily energy use, and if this also needs to provide energy in winter. To find out how much energy you need, multiply each load in the cottage by the time it is expected to be used on an average day: A 15 Watt light bulb that is switched on for 3 hours uses 3 x 15 = 45 Watt-hours of energy (that’s 0.045 kWh, a kilo-Watt-hour is simply 1000 Watt-hours). Add up all your expected energy use, and then look at our sizing table. We can help you with this.
In our southern Ontario climate the sun produces just about 2.7 kWh per average day for every 1000 Watt of solar panels, from late spring through early fall (that is just about 4 panels). In winter this will produce just about half, or 1.35 kWh per average day. This is for panels that are mounted facing south, at a 45-degree pitch angle. That angle is great if you are going to use one angle for summer and winter, if you want to optimize for one or the other, 30-degrees is optimal for summer, and 60-degrees is great for winter. The latter sheds show very well (panels produce zero, even with a dusting of snow on them, so it is essential to keep them snow-free in winter).
|Daily Energy Use (per average day)||Panels|
|0.8 kWh||0.4 kWh||1|
|1.6 kWh||0.8 kWh||2|
|2.4 kWh||1.2 kWh||3|
|3.2 kWh||1.6 kWh||4|
The inverter size is determined by all the equipment that you expect to have switched on at the same time (plus anything that switches on at unpredictable times, such as a fridge).
The cottage kits are sized for the most common energy needs found at small cottages. We can also design a system specifically for your off-grid home or cottage, just contact us.