I have a solar panel whose output is intended for use with a 12V system.
The actual output voltage under light load or no load rises to nearly 20V in bright sunlight.
I wish to obtain suggestions as to how I can regulate the panel's output voltage so that it never rises above 14 V in any circumstances.
Details: I want to use a solar panel to power a 12 VDC input to "mains voltage AC" output inverter in order to operate mains voltage A.C. Fans etc.
I wish to operate the solar panel + inverter without needing to use a low voltage battery.
When the inverter is operated directly from a 12 Volt battery it operates perfectly.
When I attach the solar panel to the inverter without a battery it does not work.
The inverter instructions advise that the inverter will only operate when the input voltage is in the range 10 to 14 VDC. However, when I use a solar panel which is intended for use with a 12 Volt lead acid battery system the open circuit voltage is well above 14 V (almost 20V) and the inverter will not start. Even if the inverter did start with eg the panel loaded temporarily to under 14V, if the temporary load is replaced by a useful load, the input voltage may rise above 14V during operation if the load is decreased and operation would cease.