Mark Wilson replied:

Ray,
I've got an 87 watt array which develops about 19volts of charge at 6 amps. As a result I was advised to run a voltage regulator. The one I use is solid state 12 volt regulator rated at 8 amps.

I use the array to charge the battery and run everything from the battery. That way I protect my appliances from power spikes that might occur as a result of fluctuating power levels from the array. From memory the voltage regulator cost about $70.00 6 years ago.

It hasn't given me a moments problem up to date.

As an example of what our 87 watt array can power. Except in periods of extremely high temperatures we can consistently run our 39 litre engel for as long as we need AS LONG AS there is 8 to 10 hours of sunshine each day.

Hope this helps.

luke replied:

mark i was wondering what the demensions of your panel are

regards luke

Stewie replied:

Ray...I run an array of 3x60w Solarex units through a solid state regulator. You need to determine whether or not your 37w panels are of the self regulating variety. This can be identified by looking at the open circuit voltage (ie in full sun with no load. a regulated panel would have about 14v on O/C whereas an unregulated unit would be around 19v, generally self regulating panels are not as efficient in marginal conditions (partially cloudy) you are better off with unregulated through a regulator. As far as power consumption is concerned you need to look at the whole picture in regard to power in/out. You may get 2.5Amps out of each of your 37w panels. Multiply this by available sunlight hours 8-10 and you are looking at a max of 20-25 A/h of input - at best. Now look at the outgoing equation, how much does your light and TV require and how long will you be using them. As long as outgoings is less than input then the battery remains charged.