# Solar Kingdom
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**Good to know:** Solar Kingdom is Solar's ultimate miner product that utilises a cascading tax system and Solar Guard Mechanics to create a sustainable miner. Kingdom miner is the only miner than aims to generate external revenue through our jackpot games! Investing in Solar has never been more lucrative.
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## What is the Solar Kingdom
Solar Kingdom is a static rewards pool. A static rewards pool is a project that you can deposit a currency into and generate stable returns on your deposit. Our rewards pool’s deposit currency is BNB. For those familiar with miners, a static rewards pool is essentially a miner without inflation!
### Daily Return On Investment
Solar Kingdom has a variable Daily Return On Investment (ROI). Depending on how many Engineers you refer, you can earn UP TO 7.5% Daily ROI. The base Daily ROI is 4%. So the more Engineers you refer, the higher your Daily ROI climbs.
### Engineers & Supervisors
There are two types of investors in Solar Kingdom. There are **“Engineers”** and there are **“Supervisors”**. \
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**Engineer:** A user who owns and operates their own Daily ROI Reactor but has 0 referrals (they are a basic, solitary investor).
**Supervisor:** An Engineer who owns and operates their own Daily ROI Reactor but has also referred other Engineers to **invest** and **build their own Daily ROI Reactors** (they are an investor that has referred other investors).
### Fuel Cells & Reactor Value
When you invest by depositing BNB into Solar Kingdom, you become an Engineer and you are given your own Daily ROI Reactor. Your Daily ROI Reactor is fuelled by Fuel Cells. When you make a BNB deposit, your BNB is automatically converted into Fuel Cells and then fed into your Daily ROI Reactor. These Fuel Cells then become Depleted Cells. \
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The more Total Depleted Cells you have, the higher your Daily ROI Reactor’s Value and thus the more rewards you receive per day.\
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Fuel Cells and Depleted Cells maintain the same value.
### Fusing & Harvesting
There are 2 things you can do with the rewards you accumulate. It is your choice to fuse **(compound)** these rewards, causing them to be fed into the Daily ROI Reactor and therefore increasing it’s value. \
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It is also your choice to harvest **(sell)** these rewards, causing them to be sold to The Grid and then sent to your wallet in the form of BNB.
### Investment Protection Mechanisms
The Total Value Locked (TVL) — The amount of BNB deposited and locked within Solar Kingdom — is once again protected by the new and improved Solar Guard. There is a maximum wallet, maximum rewards accumulation, minimum buy, minimum compound, cascading sell tax and referral bonus threshold that all ensure the stability of the TVL. \
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The **maximum wallet** simply controls how large someone’s investment can possibly get. \
The **maximum rewards** accumulation controls how much rewards can be hoarded. \
The **minimum buy** ensures that those investing are meaningful investors. \
The **minimum compound** ensures people don’t compound too often. \
The **cascading sell tax** ensures we don’t have TVL-drainers. \
The **referral bonus threshold** ensures that the referral system is safe from abuse as it requires adequate investment in order for a referrer to benefit from their referrals.
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