Customer Reviews

Sunforce 39305 650-Watt High-Efficiency Polycrystalline Solar Power Kit

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Sunforce 39305 650-Watt High-Efficiency Polycrystalline Solar Power Kit

This appears to be a good product, but I have issues with the technical descriptions:
I'd like to see the Product description edited. Although this is billed as a 650 watt kit and is shown with 5 panels, the Product description at the bottom states there are only 3 panels (at 130 Watts each). Additionally, the top-section general description states a 50 amp controller, the bottom section indicates only a 30 amp controller.

For my following comments, I have used basic electricity formula of Power(P) (in Watts) = Current(I) (in Amps) times Voltage(E) (in Volts) or P=IE
The 50 Amp controller is described as being able to handle 750 watts and allows expansion of the system. But since 5 panels at 130 watts already equals 650 watts (54 Amps at 12 Volts), another 130 Watt panel would be 780 Watts (65 Amps at 12 Volts, somewhat above the rated capacity either in Watts or Amps, whichever you choose to use for the description.

My final comment and question is that this system is described as being ideal for 12 Volt charging, but that it automatically switches for 12 or 24 volts. So is the output of the solar panels nominally 24 Volt, with the controller determining final output to the battery? My guess is that it's only a 12 Volt output (650W/12V = 54.17A), so what is the purpose of stating it's auto-switching for 24 Volt?

Clarification on all these issues will help customers make appropriate choices.

I mounted 6 of these panels on a Zomeworks Universal Track Rack UTRF-064 passive solar tracking system in California. Zomeworks was able to match theese Sunforce panels to their rail mounting holes.

Sunforce customer service was excellent. There were some kit pieces lost in shipping from the Amazon warehouse and Sunforce was able to promptly send everything I needed Fedex.

Hope to upload some photos soon once it stops raining.

Great Product very easy to install. Produces a good amount of electricity enough to cut a huge amount off your electric bill every month. This unit pays for itself in matter of year or two. SunForce stand behind its product and has exceptional customer service and support. A++ Highly Recommended Sunforce 39305 650-Watt High-Efficiency Polycrystalline Solar Power Kit

Really? The power supply in my computer requires more power than this thing provides. $3250 (on sale) seems rather expensive for something that won't even run a modern computer sufficiently!