15 Watt Solar Panel for XO-1.5, XO-1.75 and XO-4 . 6 foot cable with plug for XO power jack (5.5 mm OD / 1.7mm center pin socket). Requires 18 volt clamping diode for XO-1 (not included).
$39 USD plus $12.50 shipping per order (continental USA). Substantial subsidized discount for deployments.