How many micro-farads? what's the capacitance? Does it have a relay inside or do i need to buy one?

There is no mictofarad listing and there is no relay nor is one needed. You connect this in parallel with the run capacitor for an extra kick. This SPP5 can be installed on all Air conditioners between 4000 and 120,000 BTU. 90v-277v. I know that it is strange not having the capacitance listed. My air-conditioning unit documentation said it was compatible with SPP5 Which I thought was strange as well. Why would the air-conditioner company indicated that you might need a booster? I don’t know. Maybe it is very common. But it works fine.

Is this compatible with lennox el16xc1-036 a/c 3 ton single phase

No, this is NOT Heavy Duty enough to a 3 ton 1 phase. U need a 'bigger' Cap, but I am not sure how big. Need some electricians advice here...

does this connect to compressor or motor start capacitor? How to tell which is which?

It connects to the start capacitor.

Using supco's univ. 3 in 1 electronic relay for 1/3,1/4 and 1/2 hp compressors. can't find anything for 3/4 hp. would this work and how would connect?

This unit is not heavy duty enough for larger than 1/2 hp. It wont handle the amps for larger motors. I have no idea regarding solutions for larger systems. Grainger.com carries heavier duty equipt., I'd call them.

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Supco SPP5 Hard Start Kit, AC Compressor

Product ID: 2408374

Details

Brand
Supco
Manufacturer
SUPCO
Material
Plastic
Shape
Round
Unit Count
1.0 Count

⚡300% boost in starting torque

🔧Plug-and-play across run capacitor terminals

⏱️Installs in seconds

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₨331

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up your AC start like a pro—no sweat, just cool vibes!

DUAL POWER BOOST - Integrated relay and start capacitor work together for maximum torque and reliability.
TRUSTED HVAC UPGRADE - Highly rated with 4.5 stars from 146 users—join the pros who rely on Supco.
EFFORTLESS INSTALLATION - Snap it on in seconds—no complex wiring or professional help needed.
DURABLE COMPACT DESIGN - Built with sturdy plastic housing that fits seamlessly into your HVAC system.
TURBOCHARGE YOUR AC START - Boosts compressor starting torque by up to 300%, ensuring faster, smoother startups.

The Supco SPP5 Hard Start Kit is a compact, easy-to-install accessory that increases your AC compressor's starting torque by up to 300%. Featuring a built-in relay and start capacitor, it ensures reliable, efficient startups and reduces strain on your HVAC system. Perfect for professionals and savvy homeowners looking to upgrade performance with minimal effort.

Specifications

ASIN	B0002YTLEU
Best Sellers Rank	#411,118 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #308 in HVAC Controls
Brand Name	Supco
Customer Reviews	4.5 4.5 out of 5 stars (146)
Global Trade Identification Number	00687152197354
Item Shape	Round
Manufacturer	SUPCO
Material Type	Plastic
Model	SPP5
Part Number	SPP5
UPC	687152197354
Unit Count	1.0 Count

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