Please what is best controller charger & cables to buy- to hook this 100w solar panel into my 1100 watt Krieger inverter & marine deep cycle battery?

There are many brands on the market but we've had a lot of positive feedback on the Victron Energy SmartSolar MPPT charge controllers. They have Bluetooth built-in so from an app on your smartphone/tablet you can monitor the system in detail. With 1x100W panel you could go with the 75/10. If you're thinking of adding more panels you should size a bigger controller. Your panel(s) are going to connect to your MPPT charge controller. Then your controller will connect to your battery bank (via a breaker). This is all DC. Your inverter is separate to the solar and connects to the battery bank to invert DC to AC (probably 110V) In terms of wire size each panel has 17" of 12AWG wire with MC4 connectors built in. Depending on the distance of the wire run you could stay with 12AWG or may have to go to 10AWG for longer distances.

What is the maximum number of these that can be put in parallel?

I believe the maximum number is four. I put three of them in parallel with no problems. Your wires have to be heavy enough to handle the current, and the charge controller must be rated appropriately.

what is the effiency of the panel?

The seller claims they are 23%-25% efficient. There is no way that's true. The most expensive commercial panels are still under 23% efficiency.

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Renogy High Efficiency Flexible Monocrystalline Solar Panel, 100W, IP67 Connector, SPR-OS-FLEX-100

Product ID: 593168908

Details

Brand
Renogy
Efficiency
High
Item Weight
2 kg
Material
Silicon
Product Dimensions
116.6L x 56.9W

⚡100W max power output

🔄30° flexible panel design

🛡️IP67 waterproof connector

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Description

☀️ Flex your power with the solar panel that bends but never breaks!

POWER PACKED PERFORMANCE - Harness 100W of clean, efficient energy with cutting-edge Gen II back contact cells.
BUILT TO BRAVE THE ELEMENTS - IP67-rated connectors ensure your panel stays resilient against dust and water intrusion.
FLEXIBILITY MEETS DURABILITY - Lightweight polymer build flexes up to 30°, perfect for curved surfaces and dynamic installations.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA with premium monocrystalline silicon for long-lasting, reliable solar power.
EFFORTLESS INSTALLATION MAINTENANCE - Quick-connect cables and adhesive or grommet mounting options make setup a breeze, plus a smooth finish means easy cleaning.

The Renogy High Efficiency Flexible Monocrystalline Solar Panel delivers 100W of premium solar power through advanced Gen II back contact cells. Designed with a lightweight, flexible polymer frame that bends up to 30 degrees, it offers versatile installation options including adhesives and stainless steel grommets. Featuring IP67-rated connectors, this panel is built to withstand harsh outdoor conditions while maintaining high efficiency and easy maintenance. Made in the USA, it combines durability, portability, and top-tier solar technology for professionals seeking reliable renewable energy solutions.

Specifications

ASIN	B077H45H3F
Brand	Renogy
Country of Origin	USA
Efficiency	High Efficiency
Generic Name	solar panel
Global Trade Identification Number	00816360025917
Included Components	Solar Cables/Connectors
Item Weight	2 kg
Item model number	SPR-OS-FLEX-100
Manufacturer	Renogy
Material	Monocrystalline Silicon
Maximum Power	100 Watts
Maximum Voltage	21 Volts
Product Dimensions	116.6L x 56.9W x 2H Centimeters
Special Feature	High-efficiency Gen II back contact cells, lightweight and flexible design, resistance to power loss via cracking and corrosion

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