These sections can assist in the troubleshooting of a solar system.
• HELP NOTES: - lists some common problems with a solar system.
• MARK/(15,20) Problems: - If a problem is suspected based on the observations of the
MARK/(15,20) controller, find the condition on the MARK/(15,20) PROBLEMS chart. It will
direct you to a “MARK/(15,20) NOTE” on the next page.
• Fuse Removal Test: - provides a simple test to confirm operation.
• Battery Problems: - If you feel your batteries are not being adequately charged or are
consistently being over-charged, refer to the section BATTERY PROBLEMS.
• Solar Panels Problems: - If you feel that the solar panels are not performing adequately,
refer to the section SOLAR PANEL PROBLEMS.
NORMAL CONDITIONS:
1. “ALWAYS CHARGING” or “NEVER CHARGING” - Depending on your system, it may be
normal for the MARK/(15,20) to go for long periods of constant charging or long periods
with no charging. The function of the MARK/(15,20) is to prevent over-charging of the
battery. Therefore, it will charge continuously when the battery voltage is low and stop all
charging as long as the battery voltage is high.
2. BATTERY WATER LOSS - It is normal for unsealed batteries to need some water from
time to time. Minor water loss is not a problem; just add to the top level when needed.
Excessive water loss (a quart or more in a period of a month) may indicate a more serious
problem.
3. BATTERY GASSING - In vented batteries, some gassing is good. Gassing stirs up the
battery acid and allows the battery to fully charge. A little bubbling in the batteries is not
necessarily a problem. Refer to BATTERY WATER LOSS above.
4. TEMPERATURE - Temperature can affect the performance of batteries. They will tend to
over-charge easier when hot, and will not have as much capacity when cold. Temperature
can also affect the performance of the solar panels. The charging current can be
substantially higher in cold conditions. When sizing the system, consider the current at cold
conditions. Most panel specifications include a temperature chart.
Normal Conditions and Common Problems
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