does this not have a battery temperature sender? to avoid battery damage? is this actually mppt not pwm?

This is a PWM, *NOT* a MPPT, and expensive for a generic PWM. The irony is that Mr Ostrosky fell upon the fact that for cheap panels (17v) in parallel, a pwm is just as good as a mppt. The standard is his 17v at 70ish degrees runs at 2v less when temperature adjustment is made since the solar panel gets really hot. Mppt transforming 15v down to battery voltage vs a pwm dumping at battery voltage is essentially indistinguishable. The mppt will only boost amperage a tiny amount over the pwm. There are some good YouTube videos on this using quality lab setups.

is this actually a 60a, mppt negative ground controller?

I been struggling with this handling 60 amp output too. I use 8 gage wire. I beleive china means it can take a solar charging panel out put of up to 60A from what I have read. They are not refering to what all of are which is hiw many amps on the load side. The wiring inside unit is very thin. Like 22 gage. I am sure my trolling motor at 40 amps would cause this to melt away. Anyone know for Sure????

controller memory- Will charge controller retain my settings when I 'kill' the power while the unit is not in use?

Yes, but it doesn't matter. It's a cheap PWM fraudulently listed as MPPT.

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100A MPPT Solar Charge Controller with LCD Display Dual USB Multiple Load Control Modes,New Mppt Technical Maximum Charging Current (100A)

Product ID: 474365458

Details

Brand
SUNYIMA
Color
Blue
Display Type
LCD
Item Weight
0.31 Kilograms
Voltage
24 Volts (DC)

⚡100A max charging current

📊Real-time LCD display with 16AD accuracy

🔋99% MPPT tracking efficiency

Description

🔆 Charge smarter, live greener — never miss a watt!

DUAL USB CONVENIENCE - Charge multiple devices simultaneously without missing a beat.
NEXT LEVEL MPPT TECH - Harness up to 99% solar efficiency for smarter, faster charging.
INTUITIVE LCD DISPLAY - Monitor voltage, current, and battery status in real time with crystal clarity.
ROBUST MULTI PROTECTION - Stay worry-free with overvoltage, short circuit, overload, and overcharge safeguards.
POWER PACKED 100 A CAPACITY - Handle high loads effortlessly with industry-leading max current.

The SUNYIMA 100A MPPT Solar Charge Controller is a high-efficiency solar regulator featuring advanced MPPT technology with up to 99% tracking efficiency. It supports 12V/24V systems, dual USB outputs, and multiple load control modes, all displayed on a precise LCD screen with 16AD sampling accuracy. Designed for reliability, it includes comprehensive protection against overvoltage, short circuits, overloads, and overcharging, making it an ideal choice for professional-grade solar setups.

Specifications

ASIN	B0B6G1PNLB
Best Sellers Rank	#428,688 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #476 in Renewable Energy Controllers
Brand	SUNYIMA
Brand Name	SUNYIMA
Color	Blue
Customer Reviews	3.8 out of 5 stars 83 Reviews
Display Type	LCD
Included Components	1 x MPPT Solar Charge Controller
Item Weight	0.31 kg
Manufacturer	SUNYIMA
Material	Plastic
Material Type	Plastic
Model	MPPT 100A
Number of Packs	1
Part Number	SUNYIMA
UPC	782846135046
Unit Count	1 Count

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