I'm thinking of putting 20 of these on my hood to keep my van battery topped off. Can anyone recommend a diode or charge controller for this?

These aren't as flexible as they advertise them as being and actually snap very easily. You might be better off buying a pre-built panel if you're trying to mount on your car.

I built a 20 cell panel and get 13.2v in bright sun with almost 6a of output, but if i connect straight to a sla 12v, will these leak at night?

It's always better to use a charge controller between solar panels and a charger. Even during the day when you have a cloud or some shadow pass by, your volts can drop and battery current go back into the cells. Without a charge controller, you can use a diode to make sure current only flows in one direction. Search for solar diodes you'll find something cheap that'll do the trick for you.

Flexible Solar Cells E60 C60 5x5 3.6W Monocrystalline Cells for DIY Panels (1, No Busbars)

Flexible Solar Cells E60 C60 5x5 3.6W Monocrystalline Cells for DIY Panels (1, No Busbars)

Product ID: 171423289

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Details

Brand
Sunpower
Efficiency
High
Material
Silicon
Maximum Power
3.6 Watts
Maximum Voltage
0.6 Volts

⚡3.6W Power

🌍0.6V Output

🛠️Easy Assembly

Description

☀️ Go Solar, Go Flexible!

QUICK EASY SETUP - Assemble effortlessly with our innovative dog bone connector—no hassle, just power.
FAST GLOBAL DELIVERY - Get your solar solution in as little as 3-5 days, no matter where you are.
SUPERIOR PERFORMANCE - Experience best-in-class low light and partial shade performance for reliable energy.
LIGHTWEIGHT FLEXIBLE - Transform any surface into a solar powerhouse with ultra-thin, flexible cells.
UNLEASH SOLAR POTENTIAL - Harness the power of patented USA technology for unmatched efficiency.

The Sunpower Flexible Solar Cells E60 C60 are high-efficiency monocrystalline solar cells designed for DIY solar panel projects. Each cell outputs 0.6 volts and 3.6 watts, featuring a lightweight and flexible design for easy installation. With excellent performance in low light and partial shade, these cells promise longevity without power deterioration, and they can be delivered worldwide in just 3-5 days.

Specifications

ASIN	B081Y72TBM
Best Sellers Rank	#1,494,511 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #6,427 in Solar & Wind Power Parts & Accessories
Brand Name	Sunpower
Connector Type	Solder
Efficiency	High Efficiency
Manufacturer	Sunpower
Material Type	Monocrystalline Silicon
Maximum Power	3.6 Watts
Maximum Voltage	0.6 Volts
Model Number	E60 C60
UPC	672299860360

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