Dulas Solar VC150, Руководство пользователя

Страница: 90 / 156

90
D.7 PHOTOVOLTAIC ARRAY
SYMPTOMS OF THE FAULT
1. The refrigerator is too warm and the compressor is not running or is running only
very occasionally.
2. The Batteries become discharge periodically.
3. The indicator lights for normal operations my not be lit or the “Refrigerator
Disconnected” and “Do not Freeze Ice Packs” lights are often lit.
How to confirm this fault
ON A DAY WHEN THE SKY IS CLEAR (NO CLOUDS) AND AT ABOUT MIDDAY;
1.Clean the solar array (see page 54)
2. Check that the solar array is not shaded (see page 54)
3.Disconnect from the solar array, the array cable that leads to the charge regulator.
4. Measure and write down the short circuit current of the solar array (see page 52)
5.Measure and write down the open circuit voltage of the solar array .It should be 17-
20 volts for a 12-volt system.
6. Disconnect one module from the array and measure and write down the short
circuit current of the module (see page 52)
For 12-volt systems the short circuit current in the solar array should be
approximately (within 15%)equal to the current in a module multiplied by the number
of modules. (For example if the short circuit of one module is 2.5 Amps and there are
four modules in the array then the solar array short circuit should be 2.5 * 4 = 10
Amps).
7. If the array current and voltage do appear correct reconnect the module and array
cable. PROCEED TO THE NEXT CHECK IN THE FAULT FINDING CHART.