Is this unit full mppt, both for charging and the load? (i have noticed cheaper brands charge with pwm)

The GV-5 (as all the Genasun charge controllers) is a "real" MPPT with a tracking speed of 15 times per sec and a tracking efficiency of 99%.

Is it waterproof? Or water resistant? I will be mounting outside.

It is not waterproof. The board has a conformal coating against dust and moisture but the GV-5 has to be installed in a place protected by water. It is also highly recommended a drip loop.

Is it possible to hook up a 12v power supply to the panel side to charge a battery indoors?

Not 12v. A "12v" solar panel typically puts out anywhere from 16 to 20v and a "12v" lead acids battery's float voltage is about 13.8 but will get charged even higher during a full cycle. You could charge this indoors but I would say you would need to supply something between 14.5 and 20v.

Will this product perform well on gel-type marine batteries ?

We have only used these with flooded type marine deep cycle batteries; no issues in this case so far. According to the manufacturer's brochure, the Lead-Acid version should work with "AGM/Sealed/Flooded/Gel" types, but I recommend double-checking directly with their customer support to be on the safe side for your application.

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GV-5-Pb-12V, 5 A MPPT Solar Charge Controller for 12 V Lead-Acid Batteries and 5 A Load Output with Low Voltage Disconnect (LVD)

Product ID: 42335514

Details

Color
Bluetooth
Brand
Genasun
Voltage
12 Volts
Product Dimensions
4.3"L x 2.2"W
Item Weight
0.18 Pounds

⚡5 A max charging current

🔋65 W max solar panel power

⏱️15 Hz ultra-fast MPPT tracking

E£ 15105

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Description

🔆 Power your future with precision and speed!

SMART BATTERY PROTECTION - Integrated low voltage disconnect (LVD) and reverse polarity safeguards ensure your 12 V lead-acid battery stays safe and long-lasting.
PRECISION POWER MANAGEMENT - Harness up to 65 W solar input with a 5 A charging current for optimal battery health.
ULTRA EFFICIENT PERFORMANCE - Achieve a peak efficiency of 99.85% with near-zero night power consumption (0.125 mA) to save energy round the clock.
LIGHTNING FAST MPPT TRACKING - Experience 15 times per second tracking speed that maximizes energy harvest even in fluctuating sunlight.
BUILT TO LAST WITH CONFIDENCE - Backed by a 10-year USA-made warranty and compliance with CE, FCC, and RoHS standards—engineered for reliability and peace of mind.

The GV-5-Pb-12V is a compact, high-efficiency 5 A MPPT solar charge controller designed specifically for 12 V lead-acid batteries. It supports up to 65 W solar panels, features ultra-fast 15 Hz tracking for maximum energy capture, and includes advanced protections like low voltage disconnect and reverse polarity. With a 99.85% peak efficiency and minimal night consumption, this USA-made controller offers reliable, long-term performance backed by a 10-year warranty.

Specifications

ASIN	B01N59GOHA
Best Sellers Rank	#422,326 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #435 in Renewable Energy Controllers
Customer Reviews	4.9 4.9 out of 5 stars (22)
Item Weight	2.88 ounces
Item model number	GV-5-Pb-12V
Manufacturer	Genasun
Product Dimensions	4.3 x 2.2 x 0.9 inches

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E£ 15105

Duties & taxes included

In stock

Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to EGYPT.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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