diff --git a/config.json.example b/config.json.example
index bbd9648da..323ff711e 100644
--- a/config.json.example
+++ b/config.json.example
@@ -57,7 +57,7 @@
         "enabled": false,
         "process_throttle_secs": 3600,
         "calculate_since_number_of_days": 7,
-        "total_capital_in_stake_currency": 0.5,
+        "capital_available_percentage": 0.5,
         "allowed_risk": 0.01,
         "stoploss_range_min": -0.01,
         "stoploss_range_max": -0.1,
diff --git a/config_binance.json.example b/config_binance.json.example
index 7773a8c39..3d11f317a 100644
--- a/config_binance.json.example
+++ b/config_binance.json.example
@@ -59,7 +59,7 @@
         "enabled": false,
         "process_throttle_secs": 3600,
         "calculate_since_number_of_days": 7,
-        "total_capital_in_stake_currency": 0.5,
+        "capital_available_percentage": 0.5,
         "allowed_risk": 0.01,
         "stoploss_range_min": -0.01,
         "stoploss_range_max": -0.1,
diff --git a/config_full.json.example b/config_full.json.example
index 6134e9cad..e29c020ea 100644
--- a/config_full.json.example
+++ b/config_full.json.example
@@ -68,7 +68,8 @@
     "edge": {
         "enabled": false,
         "process_throttle_secs": 3600,
-        "calculate_since_number_of_days": 2,
+        "calculate_since_number_of_days": 7,
+        "capital_available_percentage": 0.5,
         "allowed_risk": 0.01,
         "stoploss_range_min": -0.01,
         "stoploss_range_max": -0.1,
diff --git a/docs/edge.md b/docs/edge.md
index e5575554b..829910484 100644
--- a/docs/edge.md
+++ b/docs/edge.md
@@ -82,9 +82,7 @@ Edge dictates the stake amount for each trade to the bot according to the follow
 
 Allowed capital at risk is calculated as follows:
 
-**allowed capital at risk** = **total capital** X **allowed risk per trade**
-
-**total capital** is your stake amount.
+**allowed capital at risk** = **capital_available_percentage** X **allowed risk per trade**
 
 **Stoploss** is calculated as described above against historical data.
 
@@ -92,14 +90,20 @@ Your position size then will be:
 
 **position size** = **allowed capital at risk** / **stoploss**
 
-Example:
-Let's say your stake amount is 3 ETH, you would allow 1% of risk for each trade. thus your allowed capital at risk would be **3 x 0.01 = 0.03 ETH**. Let's assume Edge has calculated that for **XLM/ETH** market your stoploss should be at 2%. So your position size will be **0.03 / 0.02= 1.5ETH**.<br/>
+Example:<br/>
+Let's say the stake currency is ETH and you have 10 ETH on the exchange, your **capital_available_percentage** is 50% and you would allow 1% of risk for each trade. thus your available capital for trading is **10 x 0.5 = 5 ETH** and allowed capital at risk would be **5 x 0.01 = 0.05 ETH**. <br/>
+Let's assume Edge has calculated that for **XLM/ETH** market your stoploss should be at 2%. So your position size will be **0.05 / 0.02 = 2.5ETH**.<br/>
+Bot takes a position of 2.5ETH on XLM/ETH (call it trade 1). Up next, you receive another buy signal while trade 1 is still open. This time on BTC/ETH market. Edge calculated stoploss for this market at 4%. So your position size would be 0.05 / 0.04 = 1.25ETH (call it trade 2).<br/>
+Note that available capital for trading didn’t change for trade 2 even if you had already trade 1. The available capital doesn’t mean the free amount on your wallet.<br/>
+Now you have two trades open. The Bot receives yet another buy signal for another market: **ADA/ETH**. This time the stoploss is calculated at 1%. So your position size is **0.05 / 0.01 = 5ETH**. But there are already 4ETH blocked in two previous trades. So the position size for this third trade would be 1ETH.<br/>
+Available capital doesn’t change before a position is sold. Let’s assume that trade 1 receives a sell signal and it is sold with a profit of 1ETH. Your total capital on exchange would be 11 ETH and the available capital for trading becomes 5.5ETH. <br/>
+So the Bot receives another buy signal for trade 4 with a stoploss at 2% then your position size would be **0.055 / 0.02 = 2.75**.
 
 ## Configurations
 Edge has following configurations:
 
 #### enabled
-If true, then Edge will run periodically<br/>
+If true, then Edge will run periodically.<br/>
 (default to false)
 
 #### process_throttle_secs
@@ -108,19 +112,24 @@ How often should Edge run in seconds? <br/>
 
 #### calculate_since_number_of_days
 Number of days of data against which Edge calculates Win Rate, Risk Reward and Expectancy
-Note that it downloads historical data so increasing this number would lead to slowing down the bot<br/>
+Note that it downloads historical data so increasing this number would lead to slowing down the bot.<br/>
 (default to 7)
 
+#### capital_available_percentage
+This is the percentage of the total capital on exchange in stake currency. <br/>
+As an example if you have 10 ETH available in your wallet on the exchange and this value is 0.5 (which is 50%), then the bot will use a maximum amount of 5 ETH for trading and considers it as available capital.<br/>
+(default to 0.5)
+
 #### allowed_risk
-Percentage of allowed risk per trade<br/>
+Percentage of allowed risk per trade.<br/>
 (default to 0.01 [1%])
 
 #### stoploss_range_min
-Minimum stoploss <br/>
+Minimum stoploss.<br/>
 (default to -0.01)
 
 #### stoploss_range_max
-Maximum stoploss <br/>
+Maximum stoploss.<br/>
 (default to -0.10)
 
 #### stoploss_range_step
diff --git a/freqtrade/constants.py b/freqtrade/constants.py
index f8fb91240..1d12d7c6e 100644
--- a/freqtrade/constants.py
+++ b/freqtrade/constants.py
@@ -192,6 +192,7 @@ CONF_SCHEMA = {
                 "process_throttle_secs": {'type': 'integer', 'minimum': 600},
                 "calculate_since_number_of_days": {'type': 'integer'},
                 "allowed_risk": {'type': 'number'},
+                "capital_available_percentage": {'type': 'number'},
                 "stoploss_range_min": {'type': 'number'},
                 "stoploss_range_max": {'type': 'number'},
                 "stoploss_range_step": {'type': 'number'},
@@ -200,7 +201,8 @@ CONF_SCHEMA = {
                 "min_trade_number": {'type': 'number'},
                 "max_trade_duration_minute": {'type': 'integer'},
                 "remove_pumps": {'type': 'boolean'}
-            }
+            },
+            'required': ['process_throttle_secs', 'allowed_risk', 'capital_available_percentage']
         }
     },
     'anyOf': [
diff --git a/freqtrade/edge/__init__.py b/freqtrade/edge/__init__.py
index 4cb0dbc31..49acbd3e7 100644
--- a/freqtrade/edge/__init__.py
+++ b/freqtrade/edge/__init__.py
@@ -9,6 +9,7 @@ import utils_find_1st as utf1st
 from pandas import DataFrame
 
 import freqtrade.optimize as optimize
+from freqtrade import constants, OperationalException
 from freqtrade.arguments import Arguments
 from freqtrade.arguments import TimeRange
 from freqtrade.strategy.interface import SellType
@@ -52,8 +53,17 @@ class Edge():
 
         self.edge_config = self.config.get('edge', {})
         self._cached_pairs: Dict[str, Any] = {}  # Keeps a list of pairs
+        self._final_pairs: list = []
 
-        self._total_capital: float = self.config['stake_amount']
+        # checking max_open_trades. it should be -1 as with Edge
+        # the number of trades is determined by position size
+        if self.config['max_open_trades'] != -1:
+            logger.critical('max_open_trades should be -1 in config !')
+
+        if self.config['stake_amount'] != constants.UNLIMITED_STAKE_AMOUNT:
+            raise OperationalException('Edge works only with unlimited stake amount')
+
+        self._capital_percentage: float = self.edge_config.get('capital_available_percentage')
         self._allowed_risk: float = self.edge_config.get('allowed_risk')
         self._since_number_of_days: int = self.edge_config.get('calculate_since_number_of_days', 14)
         self._last_updated: int = 0  # Timestamp of pairs last updated time
@@ -150,11 +160,25 @@ class Edge():
 
         return True
 
-    def stake_amount(self, pair: str) -> float:
-        stoploss = self._cached_pairs[pair].stoploss
-        allowed_capital_at_risk = round(self._total_capital * self._allowed_risk, 5)
-        position_size = abs(round((allowed_capital_at_risk / stoploss), 5))
-        return position_size
+    def stake_amount(self, pair: str, free_capital: float,
+                     total_capital: float, capital_in_trade: float) -> float:
+        stoploss = self.stoploss(pair)
+        available_capital = (total_capital + capital_in_trade) * self._capital_percentage
+        allowed_capital_at_risk = available_capital * self._allowed_risk
+        max_position_size = abs(allowed_capital_at_risk / stoploss)
+        position_size = min(max_position_size, free_capital)
+        if pair in self._cached_pairs:
+            logger.info(
+                'winrate: %s, expectancy: %s, position size: %s, pair: %s,'
+                ' capital in trade: %s, free capital: %s, total capital: %s,'
+                ' stoploss: %s, available capital: %s.',
+                self._cached_pairs[pair].winrate,
+                self._cached_pairs[pair].expectancy,
+                position_size, pair,
+                capital_in_trade, free_capital, total_capital,
+                stoploss, available_capital
+            )
+        return round(position_size, 15)
 
     def stoploss(self, pair: str) -> float:
         if pair in self._cached_pairs:
@@ -168,7 +192,6 @@ class Edge():
         """
         Filters out and sorts "pairs" according to Edge calculated pairs
         """
-
         final = []
         for pair, info in self._cached_pairs.items():
             if info.expectancy > float(self.edge_config.get('minimum_expectancy', 0.2)) and \
@@ -176,12 +199,14 @@ class Edge():
                     pair in pairs:
                 final.append(pair)
 
-        if final:
-            logger.info('Edge validated only %s', final)
-        else:
-            logger.info('Edge removed all pairs as no pair with minimum expectancy was found !')
+        if self._final_pairs != final:
+            self._final_pairs = final
+            if self._final_pairs:
+                logger.info('Edge validated only %s', self._final_pairs)
+            else:
+                logger.info('Edge removed all pairs as no pair with minimum expectancy was found !')
 
-        return final
+        return self._final_pairs
 
     def _fill_calculable_fields(self, result: DataFrame) -> DataFrame:
         """
@@ -202,9 +227,11 @@ class Edge():
         # 0.05% is 0.0005
         # fee = 0.001
 
-        stake = self.config.get('stake_amount')
+        # we set stake amount to an arbitrary amount.
+        # as it doesn't change the calculation.
+        # all returned values are relative. they are percentages.
+        stake = 0.015
         fee = self.fee
-
         open_fee = fee / 2
         close_fee = fee / 2
 
diff --git a/freqtrade/freqtradebot.py b/freqtrade/freqtradebot.py
index 53c012a17..92f735a6b 100644
--- a/freqtrade/freqtradebot.py
+++ b/freqtrade/freqtradebot.py
@@ -302,7 +302,12 @@ class FreqtradeBot(object):
         :return: float: Stake Amount
         """
         if self.edge:
-            stake_amount = self.edge.stake_amount(pair)
+            return self.edge.stake_amount(
+                pair,
+                self.wallets.get_free(self.config['stake_currency']),
+                self.wallets.get_total(self.config['stake_currency']),
+                Trade.total_open_trades_stakes()
+            )
         else:
             stake_amount = self.config['stake_amount']
 
diff --git a/freqtrade/persistence.py b/freqtrade/persistence.py
index 592a88acb..71752d58e 100644
--- a/freqtrade/persistence.py
+++ b/freqtrade/persistence.py
@@ -14,6 +14,7 @@ from sqlalchemy.exc import NoSuchModuleError
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm.scoping import scoped_session
 from sqlalchemy.orm.session import sessionmaker
+from sqlalchemy import func
 from sqlalchemy.pool import StaticPool
 
 from freqtrade import OperationalException
@@ -349,3 +350,14 @@ class Trade(_DECL_BASE):
         )
         profit_percent = (close_trade_price / open_trade_price) - 1
         return float(f"{profit_percent:.8f}")
+
+    @staticmethod
+    def total_open_trades_stakes() -> float:
+        """
+        Calculates total invested amount in open trades
+        in stake currency
+        """
+        total_open_stake_amount = Trade.session.query(func.sum(Trade.stake_amount))\
+            .filter(Trade.is_open.is_(True))\
+            .scalar()
+        return total_open_stake_amount or 0
diff --git a/freqtrade/tests/conftest.py b/freqtrade/tests/conftest.py
index 0c38019e3..df1a1cdc4 100644
--- a/freqtrade/tests/conftest.py
+++ b/freqtrade/tests/conftest.py
@@ -10,6 +10,7 @@ import arrow
 import pytest
 from telegram import Chat, Message, Update
 
+from freqtrade import constants
 from freqtrade.exchange.exchange_helpers import parse_ticker_dataframe
 from freqtrade.exchange import Exchange
 from freqtrade.edge import Edge, PairInfo
@@ -63,7 +64,6 @@ def patch_edge(mocker) -> None:
             'LTC/BTC': PairInfo(-0.21, 0.66, 3.71, 0.50, 1.71, 11, 20),
         }
     ))
-    mocker.patch('freqtrade.edge.Edge.stoploss', MagicMock(return_value=-0.20))
     mocker.patch('freqtrade.edge.Edge.calculate', MagicMock(return_value=True))
 
 
@@ -788,10 +788,13 @@ def buy_order_fee():
 
 @pytest.fixture(scope="function")
 def edge_conf(default_conf):
+    default_conf['max_open_trades'] = -1
+    default_conf['stake_amount'] = constants.UNLIMITED_STAKE_AMOUNT
     default_conf['edge'] = {
         "enabled": True,
         "process_throttle_secs": 1800,
         "calculate_since_number_of_days": 14,
+        "capital_available_percentage": 0.5,
         "allowed_risk": 0.01,
         "stoploss_range_min": -0.01,
         "stoploss_range_max": -0.1,
diff --git a/freqtrade/tests/edge/test_edge.py b/freqtrade/tests/edge/test_edge.py
index 50c4ade3d..008413ff1 100644
--- a/freqtrade/tests/edge/test_edge.py
+++ b/freqtrade/tests/edge/test_edge.py
@@ -123,9 +123,9 @@ def test_edge_results(edge_conf, mocker, caplog, data) -> None:
         assert res.close_time == _get_frame_time_from_offset(trade.close_tick)
 
 
-def test_adjust(mocker, default_conf):
-    freqtrade = get_patched_freqtradebot(mocker, default_conf)
-    edge = Edge(default_conf, freqtrade.exchange, freqtrade.strategy)
+def test_adjust(mocker, edge_conf):
+    freqtrade = get_patched_freqtradebot(mocker, edge_conf)
+    edge = Edge(edge_conf, freqtrade.exchange, freqtrade.strategy)
     mocker.patch('freqtrade.edge.Edge._cached_pairs', mocker.PropertyMock(
         return_value={
             'E/F': PairInfo(-0.01, 0.66, 3.71, 0.50, 1.71, 10, 60),
@@ -138,9 +138,9 @@ def test_adjust(mocker, default_conf):
     assert(edge.adjust(pairs) == ['E/F', 'C/D'])
 
 
-def test_stoploss(mocker, default_conf):
-    freqtrade = get_patched_freqtradebot(mocker, default_conf)
-    edge = Edge(default_conf, freqtrade.exchange, freqtrade.strategy)
+def test_stoploss(mocker, edge_conf):
+    freqtrade = get_patched_freqtradebot(mocker, edge_conf)
+    edge = Edge(edge_conf, freqtrade.exchange, freqtrade.strategy)
     mocker.patch('freqtrade.edge.Edge._cached_pairs', mocker.PropertyMock(
         return_value={
             'E/F': PairInfo(-0.01, 0.66, 3.71, 0.50, 1.71, 10, 60),
@@ -152,9 +152,9 @@ def test_stoploss(mocker, default_conf):
     assert edge.stoploss('E/F') == -0.01
 
 
-def test_nonexisting_stoploss(mocker, default_conf):
-    freqtrade = get_patched_freqtradebot(mocker, default_conf)
-    edge = Edge(default_conf, freqtrade.exchange, freqtrade.strategy)
+def test_nonexisting_stoploss(mocker, edge_conf):
+    freqtrade = get_patched_freqtradebot(mocker, edge_conf)
+    edge = Edge(edge_conf, freqtrade.exchange, freqtrade.strategy)
     mocker.patch('freqtrade.edge.Edge._cached_pairs', mocker.PropertyMock(
         return_value={
             'E/F': PairInfo(-0.01, 0.66, 3.71, 0.50, 1.71, 10, 60),
@@ -164,6 +164,42 @@ def test_nonexisting_stoploss(mocker, default_conf):
     assert edge.stoploss('N/O') == -0.1
 
 
+def test_stake_amount(mocker, edge_conf):
+    freqtrade = get_patched_freqtradebot(mocker, edge_conf)
+    edge = Edge(edge_conf, freqtrade.exchange, freqtrade.strategy)
+    mocker.patch('freqtrade.edge.Edge._cached_pairs', mocker.PropertyMock(
+        return_value={
+            'E/F': PairInfo(-0.02, 0.66, 3.71, 0.50, 1.71, 10, 60),
+        }
+    ))
+    free = 100
+    total = 100
+    in_trade = 25
+    assert edge.stake_amount('E/F', free, total, in_trade) == 31.25
+
+    free = 20
+    total = 100
+    in_trade = 25
+    assert edge.stake_amount('E/F', free, total, in_trade) == 20
+
+    free = 0
+    total = 100
+    in_trade = 25
+    assert edge.stake_amount('E/F', free, total, in_trade) == 0
+
+
+def test_nonexisting_stake_amount(mocker, edge_conf):
+    freqtrade = get_patched_freqtradebot(mocker, edge_conf)
+    edge = Edge(edge_conf, freqtrade.exchange, freqtrade.strategy)
+    mocker.patch('freqtrade.edge.Edge._cached_pairs', mocker.PropertyMock(
+        return_value={
+            'E/F': PairInfo(-0.11, 0.66, 3.71, 0.50, 1.71, 10, 60),
+        }
+    ))
+    # should use strategy stoploss
+    assert edge.stake_amount('N/O', 1, 2, 1) == 0.15
+
+
 def _validate_ohlc(buy_ohlc_sell_matrice):
     for index, ohlc in enumerate(buy_ohlc_sell_matrice):
         # if not high < open < low or not high < close < low
@@ -246,12 +282,12 @@ def mocked_load_data(datadir, pairs=[], ticker_interval='0m', refresh_pairs=Fals
     return pairdata
 
 
-def test_edge_process_downloaded_data(mocker, default_conf):
-    default_conf['datadir'] = None
-    freqtrade = get_patched_freqtradebot(mocker, default_conf)
+def test_edge_process_downloaded_data(mocker, edge_conf):
+    edge_conf['datadir'] = None
+    freqtrade = get_patched_freqtradebot(mocker, edge_conf)
     mocker.patch('freqtrade.exchange.Exchange.get_fee', MagicMock(return_value=0.001))
     mocker.patch('freqtrade.optimize.load_data', mocked_load_data)
-    edge = Edge(default_conf, freqtrade.exchange, freqtrade.strategy)
+    edge = Edge(edge_conf, freqtrade.exchange, freqtrade.strategy)
 
     assert edge.calculate()
     assert len(edge._cached_pairs) == 2
diff --git a/freqtrade/tests/test_freqtradebot.py b/freqtrade/tests/test_freqtradebot.py
index be84829e2..fdc152f9e 100644
--- a/freqtrade/tests/test_freqtradebot.py
+++ b/freqtrade/tests/test_freqtradebot.py
@@ -260,8 +260,8 @@ def test_edge_overrides_stake_amount(mocker, edge_conf) -> None:
     patch_edge(mocker)
     freqtrade = FreqtradeBot(edge_conf)
 
-    assert freqtrade._get_trade_stake_amount('NEO/BTC') == (0.001 * 0.01) / 0.20
-    assert freqtrade._get_trade_stake_amount('LTC/BTC') == (0.001 * 0.01) / 0.20
+    assert freqtrade._get_trade_stake_amount('NEO/BTC') == (999.9 * 0.5 * 0.01) / 0.20
+    assert freqtrade._get_trade_stake_amount('LTC/BTC') == (999.9 * 0.5 * 0.01) / 0.21
 
 
 def test_edge_overrides_stoploss(limit_buy_order, fee, markets, caplog, mocker, edge_conf) -> None:
@@ -342,6 +342,39 @@ def test_edge_should_ignore_strategy_stoploss(limit_buy_order, fee, markets,
     assert freqtrade.handle_trade(trade) is False
 
 
+def test_total_open_trades_stakes(mocker, default_conf, ticker,
+                                  limit_buy_order, fee, markets) -> None:
+    patch_RPCManager(mocker)
+    patch_exchange(mocker)
+    default_conf['stake_amount'] = 0.0000098751
+    mocker.patch.multiple(
+        'freqtrade.exchange.Exchange',
+        get_ticker=ticker,
+        buy=MagicMock(return_value={'id': limit_buy_order['id']}),
+        get_fee=fee,
+        get_markets=markets
+    )
+    freqtrade = FreqtradeBot(default_conf)
+    patch_get_signal(freqtrade)
+    freqtrade.create_trade()
+    trade = Trade.query.first()
+
+    assert trade is not None
+    assert trade.stake_amount == 0.0000098751
+    assert trade.is_open
+    assert trade.open_date is not None
+
+    freqtrade.create_trade()
+    trade = Trade.query.order_by(Trade.id.desc()).first()
+
+    assert trade is not None
+    assert trade.stake_amount == 0.0000098751
+    assert trade.is_open
+    assert trade.open_date is not None
+
+    assert Trade.total_open_trades_stakes() == 1.97502e-05
+
+
 def test_get_min_pair_stake_amount(mocker, default_conf) -> None:
     patch_RPCManager(mocker)
     patch_exchange(mocker)
diff --git a/freqtrade/tests/test_wallets.py b/freqtrade/tests/test_wallets.py
index 88366a869..8d9adc74c 100644
--- a/freqtrade/tests/test_wallets.py
+++ b/freqtrade/tests/test_wallets.py
@@ -58,6 +58,8 @@ def test_sync_wallet_at_boot(mocker, default_conf):
     assert freqtrade.wallets.wallets['GAS'].used == 0.1
     assert freqtrade.wallets.wallets['GAS'].total == 0.260439
     assert freqtrade.wallets.get_free('GAS') == 0.270739
+    assert freqtrade.wallets.get_used('GAS') == 0.1
+    assert freqtrade.wallets.get_total('GAS') == 0.260439
 
 
 def test_sync_wallet_missing_data(mocker, default_conf):
diff --git a/freqtrade/wallets.py b/freqtrade/wallets.py
index bf6f8b027..59d8fa3da 100644
--- a/freqtrade/wallets.py
+++ b/freqtrade/wallets.py
@@ -40,6 +40,28 @@ class Wallets(object):
         else:
             return 0
 
+    def get_used(self, currency) -> float:
+
+        if self.exchange._conf['dry_run']:
+            return 999.9
+
+        balance = self.wallets.get(currency)
+        if balance and balance.used:
+            return balance.used
+        else:
+            return 0
+
+    def get_total(self, currency) -> float:
+
+        if self.exchange._conf['dry_run']:
+            return 999.9
+
+        balance = self.wallets.get(currency)
+        if balance and balance.total:
+            return balance.total
+        else:
+            return 0
+
     def update(self) -> None:
         balances = self.exchange.get_balances()