200W 24V Solar Panel
(Surcharge Applies for - W.A, N.T., Q.L.D & Remote Regions of AU)
- Silver Aluminium Frames
- Ideal for charging 24V battery systems
- 72 x monocrystalline cells
- 30 day money back guarantee
All specifications are at 25°C cell temperature (measured at the back of the cell). Do not get confused with ambient temperature. If you cool cells below 25°C (i.e. by water cooling), you can get out more power on bright hot sunny days - up to 30% more power as cells are semi conductors.
Question: What can I run using this panel?
Under optimum conditions this panel will produce up to 5-5.58A of electrical current. This is at a cell temperature of 25°C, measured with a thermocouple from the back of the panel. It's possible to generate more than 6 amps if at 0°Celsius, i.e. in snow and bright sunlight.
If orientated facing true north on a 25° angle, the panel will receive a yearly average of 4 hours of usable sunlight each day (2 hours in winter, 6 in summer. This is based on Melbourne, Victoria.)
So, 5.5A of current for 4 hours (4 x 5.5) is 22Ah at 24 volts. This panel will produce 22Ah of power, on average, each day.
Question: So what does that mean!?
If you have an appliance, such as DC fridge, you need to find out how many amps it draws and determine how long it will run for. For example, a 24 volt 50 litre Waeco fridge and 24 volt 30 litre Engel fridge will draw an average of 0.5A at 24V each (or 1A at 12V); most users will run this 24 hours a day. So, 0.5A x 24 hours = 12ah. This means that you need a panel that produces at least 12ah a day in order to replace all of the power used by the fridge.
Q: What size battery do I need?
A battery is a storage vessel, there needs to be enough room in the battery to store energy produced by the panel.
Q: So I need a 22AH, 24V battery, right?
Wrong! Deep cycle batteries should not be discharged any more than 30% (i.e. 70% full). Discharging a battery by 80-100% will break the battery, that is shorten its life expectancy very dramatically. This means if one wants to store 22AH of usable power, one needs a 75AH, 24V battery (calculation: 22 / 0.3). More to follow. -Pip and Rod.
As a rough rule of thumb we suggest a 100ah battery for a 40 litre fridge and a 200W panel. So an 80l fridge would need a 200ah battery and 400 Watts of panels. We allow a bit extra as you will probably have LED lighting and a mobile phone charger etc.
Make sure you match the voltage of the panel, battery, regulator and appliance! You must use a 24V panel with a 24V battery, or a 12V panel with a 12V battery. A 12/24V regulator will work on both systems, but the nominal voltage of the panel and the battery must match!!! (eg 12v or 24v or 48v).