Nebula Grid System – User Guide
1. Overview
The Nebula Grid System EA is a grid-based Expert Advisor for MT5 that combines:
• Grid Trading Logic – Adds positions at predefined steps when price moves against the
anchor.
• ATR-based Step Calculation – Grid step can be based on ATR volatility or fixed points.
• Bollinger Bands Width Filter – Ensures trading only during moderate volatility
conditions.
• Money & Risk Control – Fixed lot or lot-multiplier progression, drawdown guard, and
optional trailing stop.
It is designed for ranging or oscillating markets, where grid strategies are most effective. Always
forward-test in demo before using in live trading.
2. Input Parameters
Grid Settings
• Grid Step Mode
o Fixed Points → Uses constant step size.
o ATR Multiplier → Step = ATR × multiplier.
• Grid Step Points – Step size if using fixed mode.
• ATR Multiplier – Step size in ATR mode.
• ATR Period – ATR calculation length.
• Max Long/Short Positions – Maximum number of grid layers allowed in each direction.
Take Profit / Stop Loss
• TP Multiplier – Take Profit = GridStep × multiplier.
• SL Multiplier – Stop Loss = GridStep × multiplier.
• Use Trailing Stop – Enable trailing stop.
• Trail Start (points) – Distance in profit before trailing activates.
• Trail Step (points) – Step size for trailing stop adjustment.
Bollinger Bands Filter
• Use BBW Filter – Enable/disable filter.
• BB Period / Deviation – Bollinger Bands calculation.
• BBW Min/Max (points) – Entry only if band width is within range.Money Management
• Lot Mode – Fixed lot (simple mode).
• Fixed Lot – Base lot size.
• Lot Multiplier – Next order lot size = previous lot × multiplier.
• Max Lot – Safety cap for lot size.
Safety
• Max Drawdown (%) – Prevents new entries when equity DD exceeds this percentage.
• Close All On Stop – Optionally closes all EA trades when stop triggered.
Misc
• Slippage (points) – Maximum slippage for orders.
• Print Debug – If true, prints detailed logs.
3. How It Works
1. The EA sets an anchor price (first entry reference).
2. When price moves against the position by ≥ GridStep:
o A new grid order is added (Buy below anchor, Sell above anchor).
o Each order has its own SL/TP (if enabled).
3. Bollinger Bands Width ensures entries only when volatility is within defined limits.
4. Trailing Stop can protect profits once in gain.
5. Equity Drawdown Guard halts new trading if account equity falls below safe levels.
4. Recommended Usage
• Best on ranging pairs: EURUSD, AUDUSD, GBPJPY.
• Timeframes: M15 – H1 (avoid too low to reduce noise).
• Demo Test First: Grid trading is high-risk if unchecked.
• Avoid during strong news/trend markets, as grids expand and increase exposure.
5. Example Settings
EURUSD M15
• Grid Step Mode: ATR Multiplier
• ATR Period: 14• ATR Multiplier: 1.5
• TP Multiplier: 1.0
• SL Multiplier: 2.0
• Max Long/Short Positions: 5
• Fixed Lot: 0.10
• Lot Multiplier: 1.0 (disable martingale)
• BB Period: 20, Deviation: 2.0
• BBW Min: 80, Max: 800
6. Risk Notes
• Grid trading inherently carries martingale-like risk when price trends strongly without
pullback.
• Always test with small lot sizes and enable drawdown guard.
• Consider combining with manual intervention or equity protection rules.