Go to the colaborative translation platform to help us translate this free software.
Warning: Results are approximate, it is recommended to doublecheck with sales representative and validate your installation before buying materials.
Here we are looking for the power (peak, expressed in W) from solar panels to be mounted to fulfill your needs according to your geographical location. The formula is as follow :
Pp = Dn / (Yb X Yi X Rd)
In your case, result is :
Pp = 240 / (0.85 * 0.87 * 0.8) = 406 W
Photovoltaic panels produce electricity from sunlight (solar radiation).
According entered data, 406W of solar panel are required to fulfill your daily needs of 240Wh/d.
See, understand the procedure, the calculation
One possibility could be to have 2 panel(s) monocristalin of 240W each (?). Which extend the unit capacity to 480W
We are looking here for the nominal capacity expressed in ampere per hour (Ah, given in C10)
Cap = (Dn x Aut) / (DD x U)
In your case, result is :
Cap = (240 x 4) / (0.3 x 12) = 267 Ah
Batteries are used to store electric energy produced by the panels. You will need a battery plant of 267 Ah at 12 V.
See, understand the procedure, the calculation
A wiring hypothesis would be to have 2> GEL 12V 150Ah (165Ah en C20) type batteries, which increases the plant capacity up to 300Ah
The charge controller stands between batteries and panels, its role is to handle batteries charge depending on what the panels can provide.
A wiring hypothesis would be to have a MPTT 250/65 type charge controller(?) on which would be connected 2 serialized panels
A type MPTT 250/65 charge controller, with a 12V battery plant, allows :
Note: serialization multiplies voltage (V) and paralleling multiplies the intensity (I)
All these characteristics are available in the product's technical sheet. You can customize your charge controller characteristics in Export mode.
A wiring diagram was established according to panel/charge controller/battery hypothesis :
The converter goal is to transform batteries DC current (here 12V) in AC current usable for standard devices. You need a converter able to deliver the 10W max electric power you need.
An hypothesis would be to choose a 12/180 type converter that goes up to 175W max power with possible peaks at 350W.
It is recommended to have a bettery controleur in order to check battery plant charge state.
Wire section choice ( calculate) is important in order to avoid electricity lossess :
The formula to calculate the wire section in order to avoid loss is :
S = Rho x L x I / VL
In our case it gives :
S = 0.019 x (8x2) x 7 / 0.86 = 2.47mm²
The formula to calculate the wire section in order to avoid loss is :
S = Rho x L x I / VL
In our case it gives :
S = 0.019 x (1x2) x (480 / 12) / 0.12 = 19mm²
Another and more complete wire section calculator is avalaible at sigma-tec.
Which brings to a total budget between 1897 and 2502€. Cost of panels support, wire, wire terminal and protection elements (fuse, battery cut-off, ...) is not included.
If this software was helpfull and/or you want to thank :
This software is open, free, collaborative and independent financially. So that he can stay, we need your support.
To help us, you can also contribute to its improvement, its translation.
I want to make a secure one-time donation with Paypal
I want to make a recurring, free and secure donation with Liberapay
No thanks, I just want to start the calculation
I already support CalcPvAutonomous
