Solar Panels / SP20-L10
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SP20-L10 20 W Solar Panel with Regulator


The SP20R is 20-W photovoltaic power source capable of recharging batteries. It has an on-board voltage regulator, and a 6.1 m (20 ft) cable with stripped and tinned leads that connect directly to a user-supplied deep-cycle battery.

The SP20R is often used for system configurations that have higher-than-average power requirements, or in higher elevation and latitude locations. It allows unattended operation of systems in remote locations, far from AC electrical sources.

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Benefits and Features

  • Supplies electrical power in locations where ac power is unreliable, expensive, or not available
  • On-board voltage regulator allows direct connection to a user-supplied external battery



-NOTE- Solar panel characteristics assume 1 kW m-2 illumination and 25°C solar panel temperature. Individual panels may vary up to 10%. The output panel voltage increases as the panel temperature decreases.
Maximum Peak Power 20 W
Current at Peak 1.19 A
Maximum Allowable Wind Gust Speed
  • Note: The wind ratings are for solar panels with the indicated mounts and do not account for strength of tower or tripod.
  • 44 m s-1 (99 mph) Standard mount
  • 58 m s-1 (130 mph) Extended mount
Voltage at Peak 16.8 V
Current Drain 2 mA (continuous)
Guaranteed Minimum Peak Power 18 W
On-board Regulator Included Yes
Dimensions 50.0 x 42.2 x 5.1 cm (19.7 x 16.6 x 2 in.)
Weight 6.2 kg (13.6 lb)



The solar panel includes an onboard regulator.


The SP20R-L is compatible with user-supplied, flooded 12 Vdc batteries, such as deep-cycle marine or RV batteries.


  • Flooded batteries should be charged with the 18529 MorningStar SunSaver regulator or the SP20R.
  • The SP20R draws a continuous 2 mA current drain. The 18529 MorningStar SunSaver draws a continuous 8 mA current drain.